The morphological changes of isotactic poly(propylene) cast films have been investigated during the smectic–α-monoclinic phase transition and the following melting. The small-and wide-angle X-ray scattering techniques allow to point out the different behaviour of a homopolymer sample and of two propylene-ethylene copolymer samples as a function of the presence and concentration of the ethylene comonomer. During the smectic–α-monoclinic phase transition the crystallinity increase appears to be directly connected to the lamellar thickening and/or to the formation of new lamellar stacks.
A small- and wide- angle X-ray scattering study on the smectic-α-monoclinic phase transition and on the melting behaviour of isotactic poly(propylene) cast films
MARIGO, ANTONIO;MAREGA, CARLA;
1995
Abstract
The morphological changes of isotactic poly(propylene) cast films have been investigated during the smectic–α-monoclinic phase transition and the following melting. The small-and wide-angle X-ray scattering techniques allow to point out the different behaviour of a homopolymer sample and of two propylene-ethylene copolymer samples as a function of the presence and concentration of the ethylene comonomer. During the smectic–α-monoclinic phase transition the crystallinity increase appears to be directly connected to the lamellar thickening and/or to the formation of new lamellar stacks.
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