Objective
In this work, the possibility of using non reactive or reactive core-shell particles synthesized by emulsion polymerization for toughening thermoplastic polymers or blends of polymers, was explored. The synthesis conditions leading to the desired size, structure and reactivity of the particles were optimized. The mixing parameters leading to fine particle dispersions, required for good impact properties, were determined both for discontinuous batch mixers and continuous twin screw extruders. Structural, rheological and impact properties of the blends were investigated as a function blend composition and structure of the particles. Compatibility between the shell of the particles and the matrix polymers proved to be an important parameter for improved impact properties of the blends. On the other hand, grafting of matrix chains on the surface of the reactive particles did not improve significantly the overall impact resistance of the blends, at least for the model systems investigated.
Today, blending of thermoplastic resins, miscible or not, represents a very important way of diversification for polymeric materials. Final properties of blends of incompatible homopolymers depend not only on their composition, but also on the processing conditions. All these parameters have to be adjusted to obtain the desired morphology and mechanical properties, which on the one hand must satisfy the quality requirements, but also remain unaffected during further processing and use of the final produc.
To avoid the problems arising when the species are just mechanically mixed in continuous melt processing machines, we propose to study composite systems obtained by introducing preformed particles in a thermoplastic matrix. The dispersed phase can be easily prepared by the emulsion polymerization technique, which leads to spherical latex particles. The composition and morphology of the latex is determinated by the synthesis process, whose flexibility is well known.
Moreover, to improve our understanding of interfacial phenomena, latex particles which are functionalized on their surface, will be prepared and used as the dispersed phase in incompatible blends. The mutual reactivity with other polymeric species (matrix or additives) will lead to chemical reactions in situ, during processing of the blend.
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CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
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Coordinator
67000 Strasbourg
France
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