Phase modification of Acrylate Rubber/Chlorinated Polypropylene blends by a Hindered Phenol compound

The dynamic mechanical properties and the morphologies for the binary blend s of acrylate rubber (ACM) and chlorinated polypropylene (CPP) with 3,9-bis [1,1-dimethyl-2{beta-(3-tert-butyl-4-hydroxy-5-methylphenyl)- propionyloxy} ethyl]-2,4,8,10-tetraoxaspiro[5,5]-undecane (AO-80), and their ternary syst ems were investigated. The AO-80 distribution to each phase of an immiscibl e ACM/CPP blend was studied in term of a shift in glass-transition temperat ure. It was found that when the AO-80 content is lower than 30% the AO-80 m olecules are preferentially dissolved to an ACM continuous phase, whereas a s the AO-80 content increases, a part of AO-80 molecules are incorporated t o the blend interfaces, and then to the domains of CPP. In addition, the re duction in the domain size of CPP due to adding AO-80 was also observed. A ternary blend of ACM/CPP (7:3) with AO-80 (35%) showed a novel tan delta pe ak between two peaks corresponding to ACM and CPP. This peak is attributed to an interfacial layer where a super-molecular network is formed. As a res ult, a ternary blend of ACM/CPP with AO-80 was found to be a very good damp ing material.