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Crystallization of forms I? and form II of polybutene-1 in stretched polypropylene/polybutene-1 blends

Xu, Yao; Ma, Yaping; Liu, Chenguang; Men, Yongfeng; He, Aihua

By 27 January 2020No Comments

Polymer, 2019, vol 182pp. 121817



In this work, the effects of orientated crystal morphology of polypropylene (PP) induced by tensile stretching on the subsequent crystallization behavior of polybutene-1 (PB-1) in the incompatible PP/PB-1 (50/50) blends were studied. When the PP/PB-1 blends were stretched at a temperature above melting temperature (Tm) of PB-1 but below the Tm of PP, strong orientation of PP crystals was observed under stretching. As temperature dropped below Tm of PB-1, orientated form II and I? of PB-1 appeared. In the framework of PP crystals, form I? of PB-1 was formed due to the confined effect which suppressed the formation of form II crystals. Interfacial interaction played a role in guiding the nucleation of both form II and I’ crystals resulting in highly oriented structures. The mechanism of PB-1 orientation and confined crystallization under stretching in PP/PB-1 (50/50) blends was discussed.

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