Dynamic mechanical and dielectric relaxations in poly(dibenzyl itaconate) and poly(diethylphenyl itaconate)

Dynamic mechanical and dielectric behaviour of poly(dibenzyl itaconate), an d poly(diethylphenyl itaconate) were studied. The study was performed by de termining the components of the complex relaxation modulus E* and the compl ex dielectric permittivity epsilon*. The results are compared with those pr eviously reported for poly(benzyl methacrylate), poly(monobenzyl itaconate) and poly(monoethylphenyl itaconate). The results are discussed in terms of the effect of flexible spacer groups and of the different steric hindrance between mono and disubstituted polymers. (C) 1999 Elsevier Science Ltd. Al l rights reserved.