We studied the continuous spectra of relaxation time, spectra of internal friction and heat capacity of atactic polybutadiene and its copolymers, which contained 26 and 50% acrylonitrile units. The physical nature of relaxation transitions above the glass transition temperature identified and calculated their characteristics.
(1988) Bartenev, Georgij; Shut, Nikolai; Baglyuk, Sergey; Tulinova, V.
The majority of relaxation transitions in poly (butadiene-co- acrylonitrile) that are observed above the glass transitions temperature are connected with the butadiene component. The acrylonitrile component affect the glass transitions temperature and temperature of chemical decomposition of the polymer, and it leads also to the occurrence of the relaxation process connected with the mobility of local dipole-dipole cross bonds.
