Reactive compatibilization of SAN/EPR blends. 2. Effect of type and content of reactive groups randomly attached to SAN

Kinetics of the poly(styrene-co-acrylonitrile)/poly(ethylene-co-propylene) (SAN/EPR) interfacial reaction has been varied by changing both the average number of reactive groups per SAN chain and the content of reactive SAN in the SAN phase, while keeping constant the overall SAN/EPR composition, i.e ., 75/25 w/w. For this purpose, reactive SAN chains containing 0.004, 0.028 , 0.049, and 0.078 mol/wt % of either primary amine or carbamate tan amine precursor) have been synthesized, and the content of reactive SAN in the SA N phase has been changed from 2.5 to 73.33 wt %. It appears that the number and type of reactive groups attached onto SAN affect not only the extent o f the compatibilization reaction but also the compatibilization capability of the in situ formed graft copolymer in a strong dependence on molecular w eight and molecular architecture.