Abstract
A homo polypropylene and two polypropylene copolymers with ethylene were thermo-oxidatively degraded by use of screw extruders. They were processed into inflation films and the effect of degree of degradation on the structures and properties of the films were studied.Films processed from degraded polypropylenes show superior transparency and (low temperature) dart impact strength and show inferior openability and slipperiness. Tensile modulus and yield strength are scarcely changed by degradation. This is because films processed from degraded polypropylenes contain more amorphous phase than ones processed from undegraded polypropylenes.
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