Influences of Polypropylene on Phase Ⅱ-Ⅰ Transformation of Polybutene-1
Crystal-crystal Ⅱ-Ⅰ transformation and crystal form regulation of isotactic polybutene-1(PB)determined its molding period and properties.Study on crystal-crystal Ⅱ-Ⅰ transformation of PB has always been the research hot issue.As the typical crystalline/crystalline polymer blends,the aggregation structures and thus the crystal-crystal transformation of PB in the PB/polypropylene(PP)blends are influenced greatly by PP content and crystallization temperature.In this work,the effects of PP content on the nucleation and transformation rate of PB form Ⅰ were studied.The crystallization morphology of PB/PP blends and crystal structure of PB form Ⅱ were studied by wide-angle X-ray diffraction(WAXD),differential scanning calorimetry(DSC),small-angle X-ray scattering(SAXS)and polarizing microscopy(POM).The influence of PP content on the PB form Ⅱ-Ⅰ transition was in situ observed.It was found that the nucleation of PB form Ⅰ and form Ⅱ-Ⅰ transition rate increased with the increase in PP content when ≤20 wt％ PP was blended.While the nucleation of PB form Ⅰ and form Ⅱ-Ⅰ transition rate decreased gradually with the increase in PP content when more than 25 wt％PP was blended.The nucleation of PB form Ⅰ,PB form Ⅱ-Ⅰ transition rate and transition degree in PB/PP(80/20)blend reached the highest.The influencing mechanism of PP component on PB form Ⅱ-Ⅰ transition was discussed.
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