Miscibility of crystalline and amorphous polymers: Poly-ethylene/polyisobutylene blends

Blends were prepared from a linear low density polyethylene and a polyisobutylene in the entire composition range. Flory-Huggins interaction parameters were determined from DMTA and DSC measurements. The usual technique had to be modified in the case of DSC data, since the Tg of PE cannot be determined by this technique. The two methods yielded identical results and indicated good interaction of the components, which was supported also by a SEM study and the mechanical properties of the blends.