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Both linear William-Watts (WW) and non-linear Narayanaswamy-William-Watts (NWW) stretch relaxation satisfactorily described the time dependent rigid amorphous phase growth kinetic. The model is tested upon the completely amorphous cyclic olefin copolymers (COC, polynorbornene/polyethylene copolymer), where a large T g variation is detected with annealing. Increase of the rigid amorphous fraction...
The morphology and mechanical behavior of isotactic polypropylene (iPP) and Noryl blends were studied. It is found that the fracture toughness of iPP can be significantly improved by adding rigid Noryl without causing any reduction in modulus. Large Noryl particles (about 10-15μm) are formed if no compatibilizers are utilized in the iPP/Noryl blend. The addition of a small amount of styrene-ethylene-propylene...
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