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Influences Of Molecular Weight On The Non-isothermal Crystallization And Melting Behavior Of β-nucleated Isotactic Polypropylene With Different Melt Structures

J. Kang, F. Yang, J. Chen, Ya Cao, M. Xiang
Published 2016 · Materials Science

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Previous studies reported that by tuning the fusion temperature Tf (i.e., controlling the melt structure), the β-nucleation efficiency of β-nucleated isotactic polypropylene (β-iPP) can be greatly enhanced, which was called ordered structure effect (OSE). The aim of this study is to investigate the roles of melt structures and molecular weight in non-isothermal crystallization behavior of β-iPP. Five samples with different molecular weights were prepared, and their melt structures were controlled using differential scanning calorimetry (DSC) by tuning Tf (Tf = 200 or 170 °C represent the case of without or with OSE, respectively). Results revealed that for all the samples, the lower the PP molecular weight, the lower the crystallization peak temperature Tc, and the higher the activation energy ΔE, but the occurrence of OSE behavior (i.e., Tf = 170 °C) can elevate Tc, reduces ΔE and encourages crystallization. The decrease of PP molecular weight decreases β-phase proportion no matter OSE occurs or not; moreover, for PP with high molecular weight, OSE behavior not only enhances the β-phase proportion, but also increases the thermal stability of the β-phase; however, for samples with low molecular weight, OSE behavior enhances the β-phase proportion in a larger extent, and decreases the thermal stability of the β-phase. This study provided important understandings in the effect of OSE, cooling rate and PP molecular weight the β-crystallization of iPP.
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