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V. V Guzeev


Present state and prospects for research on filled PVC


Polimery 1984, No 10-11-12, 451



DOI: dx.doi.org/10.14314/polimery.1984.451


Summary


A scientific approach to the development of filled PVC compositions is based on a concept of taking advantage of the influence on structure and properties of compositions of the supermolecular globular PVC structure appearing in polymerization and retained during melt processing. The author shows that 0.5—1.5 μm globular formations are retained under processing conditions and this is of great importance for the assumed modification of PVC with fillers or other PVC insoluble additives. It is observed that interfacial interaction between PVC and filler surface practically does not influence the dimen­sions of the highly dispersed network of filler particles which are due to remain in the interglobular regions. A "critical" concentration of the filler is found to be in the range of 5—10 volume percent. Below this level the filler particles are discrete, while above it the particles are linked within one network. A transition from discrete particles structure towards structure of particles linked in the network causes rather abrupt and pronounced changes in properties of PVC compositions. Aspects of grafting a polymer coating onto the surface of filler particles are studied from the viewpoint of structure and kinetics. A proper significance is given to the behaviour of such coating during melt processing of filled PVC. The main factor determining the morphology of polymer coating is topochemistry of the polymerization process. It is shown here that compositions containing such modi­fied filler possess much better properties than those containing the unmodified one.


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