Influence of processing conditions on the morphological and mechanical properties of compatibilized PP/LCP blends

The main aim of this work is to study theinfluence of the application of different processing conditionson the morphological and mechanical properties of thermo-plastic/LCP blends, in which the viscosity ratios are inferiorto unity and decrease with increasing temperature. The waythe microstructure...

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Bibliographic Details
Published in:Journal of applied polymer science 2007-08, Vol.105 (3), p.1521-1532
Main Authors: Filipe, Susana, Manuel Maia, João, Rosa Leal, Catarina, Teresa Cidade, Maria
Format: Article
Language:English
Subjects:
Applied sciences
Blends
Exact sciences and technology
Isotactic polyproylene
Liquid crystalline polymers
Machinery and processing
Moulding compound preparation. Mixing
Plastics
Polymer industry, paints, wood
Processing conditions
Technology of polymers
Thermoplastic
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Summary:The main aim of this work is to study theinfluence of the application of different processing conditionson the morphological and mechanical properties of thermo-plastic/LCP blends, in which the viscosity ratios are inferiorto unity and decrease with increasing temperature. The waythe microstructure evolves along the extruder determines thefinal morphology and thus, the mechanical performance ofthe systems. In the present case, the mechanical properties arerelated with the degree of fibrillation in the final composites.The best degree of fibrillation was obtained for low screwspeeds and temperatures and for intermediate outputs. Theuse of high screw speeds and processing temperatures resultsin a decrease of the viscosity ratio, in the former case via anincrease in the viscous dissipation, at the regions of highershear rates (kneading-elements). The application of a lowerprocessing temperature is advantageous for deformation,break-up, and fibrillar formation because of the higher viscos-ity ratios and higher shear stresses involved.
ISSN:0021-8995
1097-4628
DOI:10.1002/app.26412