Zum Mechanismus der Polymerkristallisation

Abstract

The results of small angle X-ray scattering experiments and electron microscopic investigations on branched polyethylene suggest a new model of partial crystallization and melting. The formation of lamellar structures is described as a consecutive process (insertion crystallization) controlled by the concentration of non-crystallizable units in the amorphous layers. Crystallization kinetics upon stepwise cooling is investigated by dilatometry. Comparison of low angle X-ray scattering and Raman spectroscopic results provides evidence for a accumulation of comonomer units at the lamellar surfaces.