Modification of CPEE Polymers

Incorporation of fillers into CPEE, however, presents a problem, since the polymer is in the continuous phase and the filler in a dispersed phase. Intermediate layers of 0.001-120 pm thick are formed between filler and polymer particles, with a non-homogeneous structure depending on the properties if the polymer and filler and on the method of production of the system. A chemically active preparation of the filler surfaces is used industrially to increase adhesion and fillers containing an aminosilane or epoxy preparation are recommended. 

Calcium metasilicate causes an increase in flexural stress value while the impact strength is retained at its original high level. The elastomeric properties are retained if the mass percent of filler does not exceed 30%, as a result of the significantly lower L/D ratio of calcium metasilicate compared with that of glass and cotton fibre. Spherical fillers make it possible to retain the elastomeric properties and to increase the strength by almost 100%. A marked reduction in compound cost can also be gained, since most of the fillers are some 5-10 times less expensive than CPEE. 

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