Structure Property Relationships in PA 6 and PP Copolymers Blended by Single and Twin Screw Extrusion
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C. A. Correa
Abstract
Polyamides such as polycaprolactam (PA 6) and poly(hexamethylene adipamide) (PA 6.6), are generally classified as pseudo-ductile materials. Fracture behaviour of PA can be changed by melt compounding with modified olefinic elastomers such as Ethylene-propylene copolymers (EPM and EPDMs) and nitrile rubbers (NBRs). Often, small amounts of a compatibilizer are added to the polymer blend in order to assure good dispersion, morphology stability and consistent end-use properties. Maleated polypropylene (PP-MAH) has been used as compatibilizer in blends of polyamides with polyolefins as they tend to react with amine end groups in the polyamide molecules and also interact by molecular entanglement with non-funcionalized polypropylene chains. This work was intended to optimise stiffness-toughness balance in polyamide/ polypropylene blends by reactive processing of PA 6 with polypropylene heterophase copolymers using the PP-MAH as a compatibilizer. Effects of processing conditions on the blend morphology and mechanical properties were investigated by comparing compatibilized and non-compatibilized blends prepared by single and twin screw extrusion. Such approach was intended to investigate whether blend morphology and its response to processing steps can be controlled by blend composition, changes in rheology and interfacial tension during reactive processing. Viscosity measurements by torque rheometry and particle coalescence in-situ observations were performed in order to provide additional evidence of mechanisms relating to phase morphology definition in such systems.
Acknowledgements
The authors are grateful to the Universidade São Francisco and Universidade Federal de São Carlos for the use of their laboratory facilities and the Fundação de Amparo à Pesquisa do Estado de São Paulo for the financial support (FAPESP Proc. No. 02/03909-5). The achnowlegements also shall be extended to Mr. Edson N. Ito for his assistance in the parallel-plate oscillatory rheometry and to Professor John Vlachopoulos, Elizabeth Takács and Velichko Hristov at McMaster University in Canada for their kind support on the rheometry and coalescence measurements during Carlos Correa sabbatical stay at McMaster.
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© 2006 Hanser Publishers, Munich
Artikel in diesem Heft
- Contents
- Rapid Communications
- A Novel High Flow Rate Pin for Water-assisted Injection Molding of Plastic Parts with a More Uniform Residual Wall Thickness Distribution
- Regular Contributed Articles
- Structure Property Relationships in PA 6 and PP Copolymers Blended by Single and Twin Screw Extrusion
- Stretchability and Properties of Biaxially Oriented Polypropylene Film
- Dynamic Mold Surface Temperature Control Using Induction and Heater Heating Combined with Coolant Cooling
- Visualization of Melt-Flow Behavior Inside the Runner in Ultra High Speed Injection Molding
- Effects of Cavity Conditions on Transcription Molding of Microscale Prism Patterns Using Ultra-High-Speed Injection Molding
- Effect of Melt and Mold Temperature on Fiber Orientation during Flow in Injection Molding of Reinforced Plastics
- Invited Paper
- Polymer/Layered Silicate Nano-composites
- Regular Contributed Articles
- Paste Extrusion of Polytetrafluoroethylene: Temperature, Blending and Processing Aid Effects
- Influence of Viscosity-interface Modifier Interactions on Performance and Processability of Rice Hull PE Composites
- Single and Multi Objective Optimization for Injection Molding Using Numerical Simulation with Surrogate Models and Genetic Algorithms
- A Process Classification Number for the Solidification of Crystallizing Materials
- Effect of Aerodynamics on Film Blowing Process
- Analysis of Necking Deformation Behavior in High-Speed In-line Drawing Process of PET by On-line Diameter and Velocity Measurements
- PPS News
- PPS News
- Seikei-Kakou Abstracts
- Seikei-Kakou Abstracts
Artikel in diesem Heft
- Contents
- Rapid Communications
- A Novel High Flow Rate Pin for Water-assisted Injection Molding of Plastic Parts with a More Uniform Residual Wall Thickness Distribution
- Regular Contributed Articles
- Structure Property Relationships in PA 6 and PP Copolymers Blended by Single and Twin Screw Extrusion
- Stretchability and Properties of Biaxially Oriented Polypropylene Film
- Dynamic Mold Surface Temperature Control Using Induction and Heater Heating Combined with Coolant Cooling
- Visualization of Melt-Flow Behavior Inside the Runner in Ultra High Speed Injection Molding
- Effects of Cavity Conditions on Transcription Molding of Microscale Prism Patterns Using Ultra-High-Speed Injection Molding
- Effect of Melt and Mold Temperature on Fiber Orientation during Flow in Injection Molding of Reinforced Plastics
- Invited Paper
- Polymer/Layered Silicate Nano-composites
- Regular Contributed Articles
- Paste Extrusion of Polytetrafluoroethylene: Temperature, Blending and Processing Aid Effects
- Influence of Viscosity-interface Modifier Interactions on Performance and Processability of Rice Hull PE Composites
- Single and Multi Objective Optimization for Injection Molding Using Numerical Simulation with Surrogate Models and Genetic Algorithms
- A Process Classification Number for the Solidification of Crystallizing Materials
- Effect of Aerodynamics on Film Blowing Process
- Analysis of Necking Deformation Behavior in High-Speed In-line Drawing Process of PET by On-line Diameter and Velocity Measurements
- PPS News
- PPS News
- Seikei-Kakou Abstracts
- Seikei-Kakou Abstracts
