Publicações no PortAberta

Co-autor de rede

Mapa da Ciência

José António Colaço Gomes Covas

Pessoa

Publicações
Fundo
Contato
Ver Todos

publicações selecionadas

artigo académico
- Predicting the effect of build orientation and process temperatures on the performance of parts made by fused filament fabrication. Rapid Prototyping Journal. 2022
- Optimization of Polymer Processing: A Review (Part II-Molding Technologies). Materials. 2022
- Optimization of Polymer Processing: A Review (Part I-Extrusion). Materials. 2022
- 3D printing of graphene-based polymeric nanocomposites for biomedical applications. Functional Composite Materials. 2021
- Vibration control systems: A review of their application to historical unreinforced masonry buildings. Journal of Building Engineering. 2021
- Poly(Lactic Acid)/Graphite Nanoplatelet Nanocomposite Filaments for Ligament Scaffolds. Nanomaterials. 2021
- In-Line Rheo-Optical Investigation of the Dispersion of Organoclay in a Polymer Matrix during Twin-Screw Compounding. Polymer. 2021
- The Effect of a Phase Change on the Temperature Evolution during the Deposition Stage in Fused Filament Fabrication. Computers. 2021
- In-process rheological monitoring of extrusion-based polymer processes. Polymer International. 2021
- Computer Aided Definition of the Printing Conditions of Parts Made by FFF. International Journal of Mechanical Engineering and Robotics Research. 2021
- Development of electrically conductive polymer nanocomposites for the automotive cable industry. Polimeros-Ciencia e Tecnologia. 2021
- Dispersion of Graphite Nanoplates in Polypropylene by Melt Mixing: The Effects of Hydrodynamic Stresses and Residence Time. Polymer. 2020
- Film Blowing of PHB-Based Systems for Home Compostable Food Packaging. International Polymer Processing. 2020
- Minimally processed date palm (Phoenix dactylifera L.) leaves as natural fillers and processing aids in poly(lactic acid) composites designed for the extrusion film blowing of thin packages. Carbohydrate Polymers. 2020
- In-process assessment of clay dispersion in PLA during melt compounding: Effects of screw speed and filler content. Polymer Degradation and Stability. 2020
- Online optical monitoring of polymer melting in a twin-screw extruder. Polymer Engineering and Science. 2020
- Assessment of the Mechanical and Thermal Properties of Injection-Molded Poly(3-hydroxybutyrate-co-3-hydroxyhexanoate)/Hydroxyapatite Nanoparticles Parts for Use in Bone Tissue Engineering. Polymer. 2020
- Taking advantage of the functional synergism between carbon nanotubes and graphene nanoplatelets to obtain polypropylene-based nanocomposites with enhanced oxidative resistance. European Polymer Journal. 2020
- Evolution of dispersion in the melt compounding of a model polymer nanocomposite system: A multi-scale study. Packaging Technology and Science. 2019
- Assessment of Piezoelectric Sensors for the Acquisition of Steady Melt Pressures in Polymer Extrusion. Fluids. 2019
- Multi-parameter in-process monitoring of clay dispersion during melt compounding with PLA. eXPRESS Polymer Letters. 2019
- The Effect of the Process on Mechanical Properties of Polylactic Acid-Date Palm Leaf Fibers Composite Films Produced by Extrusion Blowing. Packaging Technology and Science. 2019
- Melt processability, characterization, and antibacterial activity of compression-molded green composite sheets made of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) reinforced with coconut fibers impregnated with oregano essential oil. Food Packaging and Shelf Life. 2018
- Electrically Conductive Polyetheretherketone Nanocomposite Filaments: From Production to Fused Deposition Modeling. Polymer. 2018
- Evaluation of the role of carbon nanotubes on the electrical properties of poly(butylene terephthalate) nanocomposites for industrial applications. Journal of Elastomers and Plastics. 2018
- A new double-slit rheometrical die for in-process characterization and extrusion of thermo-mechanically sensitive polymer systems. Packaging Technology and Science. 2018
- Effects of Particle Size and Surface Chemistry on the Dispersion of Graphite Nanoplates in Polypropylene Composites. Polymer. 2018
- Using multiobjective optimization algorithms and decision making support to solve polymer extrusion problems. Polymer Engineering and Science. 2018
- Development of Dispersion during Compounding and Extrusion of Polypropylene/Graphite Nanoplates Composites. International Polymer Processing. 2017
- Real-time thermo-optical analysis of polymer samples by quantitative polarized optical microscopy. Journal of Thermal Analysis and Calorimetry. 2017
- Estimation of filament temperature and adhesion development in fused deposition techniques. Journal of Materials Processing Technology. 2017
- A Journey along the Extruder with Polystyrene:C60 Nanocomposites: Convergence of Feeding Formulations into a Similar Nanomorphology. Biomacromolecules. 2017
- Tracking the progression of dispersion of graphite nanoplates in a polypropylene matrix by melt mixing. Polym. Compos.. 2017
- Effects of fermentation residues on the melt processability and thermomechanical degradation of PHBV produced from cheese whey using mixed microbial cultures. Polymer Degradation and Stability. 2016
- A New Extensional Mixing Element for Improved Dispersive Mixing in Twin-Screw Extrusion, Part 2: Experimental Validation for Immiscible Polymer Blends. Advances in Polymer Technology. 2016
- Film blowing of PHBV blends and PHBV-based multilayers for the production of biodegradable packages. Journal of Applied Polymer Science. 2016
- A New Extensional Mixing Element for Improved Dispersive Mixing in Twin-Screw Extrusion, Part 1: Design and Computational Validation. Advances in Polymer Technology. 2015
- Dispersion and re-agglomeration of graphite nanoplates in polypropylene melts under controlled flow conditions. Composites Part A: Applied Science and Manufacturing. 2015
- Probing dispersion and re-agglomeration phenomena upon melt-mixing of polymer-functionalized graphite nanoplates. Soft Matter. 2015
- A Small-Scale Experimental Extrusion Set-Up for Exploring Relationships Between Process-Induced Structures and Characteristics of Multiphase Polymer Systems. Macromolecular Materials and Engineering. 2015
- Rheo-optical characterization of liquid crystalline acetoxypropylcellulose melt undergoing large shear flow and relaxation after flow cessation. Polymer. 2015
- Rheology of organoclay assisted extrusion of HDPE using Particle Image Velocimetry. Chemical Engineering Research & Design. 2015
- Enhancement in the performance of multi-walled carbon nanotube: Poly(methylmethacrylate) composite thin film ethanol sensors through appropriate nanotube functionalization. Materials Science in Semiconductor Processing. 2015
- Development of polyhydroxyalkanoate/beer spent grain fibers composites for film blowing applications. Polymer. 2015
- Thermal conditions affecting heat transfer in FDM/FFE: a contribution towards the numerical modelling of the process. Virtual and Physical Prototyping. 2015
- Functionalized cork-polymer composites (CPC) by reactive extrusion using suberin and lignin from cork as coupling agents. Composite Structures. 2014
- Hybrid algorithms for the twin-screw extrusion configuration problem. Applied Soft Computing. 2014
- Predicting extrusion instabilities of commercial polyethylene from non-linear rheology measurements. Rheologica Acta. 2014
- The influence of pellet-barrel friction on the granular transport in a single screw extruder. Powder Technology. 2014
- The Plasticating Sequence in Barrier Extrusion Screws Part II: Experimental Assessment. Polymer - Plastics Technology and Engineering. 2014
- In-line particle size assessment of polymer suspensions during processing. Packaging Technology and Science. 2014
- Influence of different organomodified clays on the viscoelastic response of ethylene vinyl acetate//poly(vinyl chloride)/organoclay nanocomposites. Journal of Elastomers and Plastics. 2014
- Influence of screw speed on the mechanical and rheological properties of poly(ethylene-co-vinyl acetate)-organomodified montmorillonite nanocomposites. Polymer. 2014
- Preparation of Polymer-Clay Nanocomposites by Melt Mixing in a Twin Screw Extruder: Using On-Line SAOS Rheometry to Assess the Level of Dispersion. International Polymer Processing. 2014
- Processing Conditions Effect on Dispersion Evolution in a Twin-Screw Extruder: Polypropylene-Clay Nanocomposites. Chemical Engineering & Technology. 2014
- An Engineering Scale-Up Approach using Multi-Objective Optimization. International Journal of Natural Computing Research. 2014
- Experimental optimization of a passive planar rhombic micromixer with obstacles for effective mixing in a short channel length. Nanoscale. 2014
- The plasticating sequence in barrier extrusion screws part I: Modeling. Polymer Engineering and Science. 2014
- Evolution of dispersion along the extruder during the manufacture of polymer-organoclay nanocomposites. Chemical Engineering Science. 2013
- Poly(lactic acid) composites with poly(lactic acid)-modified carbon nanotubes. Journal of Polymer Science Part A: Polymer Chemistry. 2013
- Dispersion and re-agglomeration phenomena during melt mixing of polypropylene with multi-wall carbon nanotubes. Packaging Technology and Science. 2013
- Assessing the practical utility of the hole-pressure method for the in-line rheological characterization of polymer melts. Rheologica Acta. 2013
- In-line near-infrared spectroscopy: A tool to monitor the preparation of polymer-clay nanocomposites in extruders. Journal of Applied Polymer Science. 2013
- The influence of carbon nanotube functionalization route on the efficiency of dispersion in polypropylene by twin-screw extrusion. Composites Part A: Applied Science and Manufacturing. 2012
- Flow and Heat Transfer Along the Length of a Co-rotating Twin Screw Extruder. Polymer - Plastics Technology and Engineering. 2012
- Laboratory modular instrumented single screw extruder for optimisation of polymer processing 2012
- Monitoring the Production of Polymer Nanocomposites by Melt Compounding with On-line Rheometry. International Polymer Processing. 2012
- Quantitative evaluation of the dispersion achievable using different preparation methods and DC electrical conductivity of vapor grown carbon nanofiber/epoxy composites. Packaging Technology and Science. 2012
- Bi-axially Oriented Blown Film Technology. International Polymer Processing. 2012
- Effect of filler dispersion on the electromechanical response of epoxy/vapor-grown carbon nanofiber composites. Smart Materials and Structures. 2012
- In-line near-infrared spectroscopy for the characterization of dispersion in polymer-clay nanocomposites. Packaging Technology and Science. 2012
- The effect of flow type and chemical functionalization on the dispersion of carbon nanofiber agglomerates in polypropylene. Composites Part A: Applied Science and Manufacturing. 2012
- A Quantitative Approach to Assess the Mixing Ability of Single Screw Extruders for Polymer Extrusion. International Journal of Environmental Science and Technology. 2012
- Multi-objective ant colony optimization for the twin-screw configuration problem. Engineering Optimization. 2012
- The effect of processing conditions on the characteristics of electrically conductive thermoplastic composites. Journal of Thermoplastic Composite Materials. 2012
- The role of disorder on the AC and DC electrical conductivity of vapour grown carbon nanofibre/epoxy composites. Composites Science and Technology. 2012
- Modelling pellet flow in single extrusion with DEM. Proceedings of the Institution of Mechanical Engineers Part E-Journal of Process Mechanical Engineering. 2011
- Measuring the rheological properties of polymer melts with on-line rotational rheometry. Packaging Technology and Science. 2011
- Liquid sensing properties of melt processed polypropylene/poly(e-caprolactone) blends containing multiwalled carbon nanotubes. Composites Science and Technology. 2011
- Nanoclays Dispersion in a PA6/PP Blend by Twin Screw Compounding. Macromolecular Symposia. 2011
- Morphology and Rheology of Polypropylene/Polystyrene/Clay Nanocomposites in Batch and Continuous Melt Mixing Processes. Macromolecular Materials and Engineering. 2011
- Application of Evolutionary Algorithms to the Definition of the Optimal Twin-Screw Extruder Configuration for Starch Cationization. Polymer Engineering and Science. 2011
- Engineering an efficient two-phase local search algorithm for the co-rotating twin-screw extruder configuration problem. Energy Policy. 2011
- The influence of the dispersion method on the electrical properties of vapor-grown carbon nanofiber/epoxy composites. Nanoscale Research Letters. 2011
- Melt Processing of Chitosan-Based Fibers and Fiber-Mesh Scaffolds for the Engineering of Connective Tissues. Journal of Colloid and Interface Science. 2010
- Tribological, rheological and mechanical characterization of polymer blends for ropes and nets. Tribology International. 2010
- Estimation of the Morphology Development of Immiscible Liquid-Liquid Systems during Single Screw Extrusion. Polymer Engineering and Science. 2010
- Dynamics of Filler Size and Spatial Distribution in a Plasticating Single Screw Extruder – Modeling and Experimental Observations. International Polymer Processing. 2010
- Synthesis, extrusion and rheological behaviour of PU/HA composites for biomedical applications. Carbohydrate Polymers. 2010
- Modelling of the Thermal Behaviour of Free Form Extrusion. Key Engineering Materials. 2010
- The Morphology during Extrusion of PA6/PP Blends in the Presence of Nanoclays. Key Engineering Materials. 2010
- Contribution of the melting stage to the evolution of the morphology and chemical conversion of immiscible polyamide/polyethylene blends in twin-screw extruders. Journal of Applied Polymer Science. 2009
- Dispersion mechanisms of nanoclays in a polymer matrix by electron microscopy. Microscopy and Microanalysis. 2009
- Extrusion Scale-up: An Optimization-based Methodology. International Polymer Processing. 2009
- Electrically Conductive Monofilaments for Smart Textiles. Advances in Science and Technology. 2008
- Multilayer plug concept to enhance thickness distribution control of deep thermoformed parts 2008
- Melting of PP/PA6 Polymer Blends in Single Screw Extruders – An Experimental Study. Key Engineering Materials. 2008
- Small-scale production of co-extruded biaxially oriented blown film. Packaging Technology and Science. 2008
- Global Mixing Indices for Single Screw Extrusion. International Journal of Material Forming. 2008
- Towards modelling of Free Form Extrusion: Analytical solution of transient heat transfer. International Journal of Material Forming. 2008
- On-line rotational rheometry for extrusion and compounding operations. Journal of Non-Newtonian Fluid Mechanics. 2008
- Robustness in multi-objective optimization using evolutionary algorithms. Computational Optimization and Applications. 2008
- Phase morphology development during processing of compatibilized and uncompatibilized PBT/ABS blends. Journal of Applied Polymer Science. 2007
- Dispersion of Carbon Nanotubes in Polycarbonate and Its Effect on the Composite Properties. Key Engineering Materials. 2006
- Dynamic Vulcanisation of EPDM-Based Thermoplastic Vulcanisates during Extrusion: Effect of Processing Conditions. Key Engineering Materials. 2006
- Modelling of Mixing in Single Screw Extruders. Key Engineering Materials. 2006
- Multilayer Plug Assisted Thermoforming-Concept and Practical Usefulness. Key Engineering Materials. 2006
- Helical flow during rotational pipe extrusion 2006
- The Effect of the Compatibilization Route of PA/PO Blends on the Physico-chemical Phenomena Developing Along a Twin-screw Extruder. Macromolecular Symposia. 2006
- Evolution of the peroxide-induced degradation of polypropylene along a twin-screw extruder: Experimental data and theoretical predictions. Journal of Applied Polymer Science. 2006
- Melting of polymer blends in single-screw extrusion - an experimental study. International Journal of Material Forming. 2006
- Monitoring Reactive Processes along the Extruder. International Polymer Processing. 2005
- A Computational Study on the Influence of the Rheological Behavior of Polystyrene and its Blends on their Thermoforming Ability. International Journal of Environmental Science and Technology. 2005
- Continuous Production of Polycarbonate-Carbon Nanotube Composites. International Journal of Environmental Science and Technology. 2005
- Defining the configuration of co-rotating twin-screw extruders with multiobjective evolutionary algorithms. Polymer Engineering and Science. 2005
- Evolução da morfologia de fases de blendas PA6/AES em extrusora de dupla rosca e moldagem por injeção. Polimeros-Ciencia e Tecnologia. 2005
- On-line monitoring of the residence time distribution along a kneading block of a twin-screw extruder. Packaging Technology and Science. 2004
- Design of calibrators for extruded profiles. Part I: Modeling the thermal interchanges. Polymer Engineering and Science. 2004
- Optimisation-based design of extruders 2004
- A miniature extrusion line for small scale processing studies. Packaging Technology and Science. 2004
- Effect of Experimental Conditions on the Grafting of Maleic Anhydride onto Polyethylene in Extruders. Key Engineering Materials. 2004
- Modelling of the Grafting of Maleic Anhydride onto Polyethylene in an Extruder. Key Engineering Materials. 2004
- On the Use of the Heating Stage to Control the Thickness Distribution in Thermoformed Parts. International Polymer Processing. 2004
- A study of grafting reactions during processing of polyolefins. Advances in Polymer Technology. 2004
- Evolution of peroxide-induced thermomechanical degradation of polypropylene along the extruder. Journal of Applied Polymer Science. 2004
- Online monitoring techniques for studying evolution of physical, rheological and chemical effects along the extruder. Plastics Rubber and Composites Processing and Applications. 2004
- A study of residence time distribution in co-rotating twin-screw extruders. Part II: Experimental validation. Polymer Engineering and Science. 2003
- Analysis of the Morphological Development of PBT/ABS Blends during the Twin Screw Extrusion and Injection Molding Processes. International Polymer Processing. 2003
- Interfacial chemistry and morphology of in-situ compatibilised PA-6 and PBT based blends. Macromolecular Symposia. 2003
- Infrared sheet heating in roll fed thermoforming: Part 2 - Factors influencing inverse heating solution. Plastics Rubber and Composites Processing and Applications. 2003
- Evolution of Chemistry, Morphology and Rheology of Various Polymer Systems along a Twin-Screw Extruder. The Canadian Journal of Chemical Engineering. 2002
- Visualisation and Analysis of the Flow along the Kneading Block of a Twin-screw Extruder. International Polymer Processing. 2002
- Monitoring the evolution of the properties of PA-6/EPM-g-MA blends in a twin-screw extruder. Polymer Engineering and Science. 2002
- Polymer Melt Flow through Channels with Vibrating Walls. Key Engineering Materials. 2002
- IR sheet heating in roll fed thermoforming: Part 1 - Solving direct and inverse heating problems. Plastics Rubber and Composites Processing and Applications. 2002
- Optimization of Processing Conditions for Polymer Twin-Screw Extrusion. International Polymer Processing. 2002
- Recycling of poly(ethylene terephthalate) as polymer-polymer composites. Polymer Engineering and Science. 2002
- On-Line Rheometry for Twin-Screw Extrusion (Along the Extruder) and its Applications. Applied Rheology. 2002
- Sources of error and other difficulties in extensional rheometry revisited: commenting and complementing a recent paper by T. Schweizer. Rheologica Acta. 2002
- Direct Method for Deconvolving Two Residence Time Distribution Curves. International Polymer Processing. 2001
- Monitoring the Evolution of Morphology of Polymer Blends Upon Manufacturing of Microfibrillar Reinforced Composites. International Journal of Polymeric Materials. 2001
- The Design of Extrusion Screws: An Optimization Approach. International Polymer Processing. 2001
- A look inside the extruder: evolution of chemistry, morphology and rheology along the extruder axis during reactive processing and blending. Macromolecular Symposia. 2001
- Effect of polyolefin structrure on maleic anhydride grafting. Polymer. 2001
- Effect of composition and processing conditions on the chemical and morphological evolution of PA-6/EPM/ EPM-g-MA blends in a corotating twin-screw extruder. Journal of Applied Polymer Science. 2001
- Monitoring polyolefin modification along the axis of a twin screw extruder. I. Effect of peroxide concentration. Journal of Applied Polymer Science. 2001
- Rheological measurements along an extruder with an on-line capillary rheometer. Packaging Technology and Science. 2000
- Experimental and theoretical study of twin-screw extrusion of polypropylene. Journal of Applied Polymer Science. 2000
- Monitoring polyolefin modification along the axis of a twin-screw extruder. II. Maleic anhydride grafting. Journal of Polymer Science Part A: Polymer Chemistry. 2000
- Rheology of PA-6/EPM/EPM-g-MA blends along a twin-screw extruder. Advances in Polymer Technology. 2000
- Flow patterns in twin-screw extruders. Journal of Materials Processing Technology. 1999
- Relationship between gelation and wall slip in unplasticised poly(vinyl chloride) compounds 1999
- Solving Extrusion Problems - Comparison Between Theoretical and Experimental Approaches. Polymer Engineering and Science. 1999
- Chemical and morphological evolution of PA-6/EPM/EPM-g-MA blends in a twin screw extruder. Journal of Polymer Science Part A: Polymer Chemistry. 1999
- Evolution of morphology and of chemical conversion along the screw in a corotating twin-screw extruder. Journal of Applied Polymer Science. 1999
- Measuring uniaxial extensional viscosity using a modified rotational rheometer. Journal of Non-Newtonian Fluid Mechanics. 1999
- Optimization of polymer extrusion with genetic algorithms. IMAJ. of Math. Appl. in Business and Industry. 1998
- Optimisation of Single Screw Extrusion - Theoretical and Experimental Results. Int. J. Forming Processes. 1998
- Production and Characterization of Innovative Carbon Fiber-Polycarbonate Composites. Polymer. 1998
- Production and assessment of polycarbonate composites reinforced with vapour-grown carbon fibres. Composites Science and Technology. 1998
- Polystyrene/EVA melt blends compatibilized with EVA-graft-polystyrene. Journal of Applied Polymer Science. 1997
- Design and Assessment of Mandrel Pipe Dies. Plast. Rubb. Comp. Proc. & Appl. 1995
- The effect of reprocessing on the properties of PVC. Journal of Vinyl & Additive Technology. 1993
- The use of differential scanning calorimetry to study the reprocessing of poly(vinyl chloride). Polymer. 1993
- Single screw extrusion of poly(vinyl chloride): Effect on fusion and properties. Polymer Engineering and Science. 1992
- Elasticity of poly(vinyl chloride) melts. Polymer. 1992
- Optimizing the processing of rigid PVC compounds. Journal of Vinyl & Additive Technology. 1991
- Designing Extrusion Dies for Thermoplastics. Journal of Elastomers and Plastics. 1991
- Assessing the convergent flow analysis as a technique for characterizing the extensional flow of polymer melts. Packaging Technology and Science. 1990
- Hardness Measurement as a Technique for Assessing Gelation of Rigid PVC Compounds. Plast. Rubb. Proc. & Applic. 1988
- Twin Screw Extrusion of a Rigid PVC Compound - Effect of Processing Conditions on Fusion and Properties. Plast. Rubb. Proc. & Applic., . 1988
capítulo de livro
documento
- SoftExtrusion 2004 – Modelação da Extrusão de Polímeros 2005
- Rheological Fundamentals of Polymer Processing 1995
livro
- Optimization in Polymer Processing 2011
- Reologia e suas aplicações industriais 2001
- Extruder Principles and Operation 1995