Interfacial nucleation in iPP/PB-1 blends promotes the formation of polybutene-1 trigonal crystals

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	Interfacial nucleation in iPP/PB-1 blends promotes the formation of polybutene-1 trigonal crystals
	Wang, Zefan; Dong, Xia; Liu, Guoming; Xing, Qian; Cavallo, Dario; Jiang, Qianhong; Muller, Alejandro J.; Wang, Dujin
刊名	POLYMER
	FEB 28 2018
卷号	138 页码:396-406
英文摘要	The formation of trigonal Form I' crystals of polybutene-1 (PB-1) directly from melt has drawn much attention in past decades. In this study, we investigate the fractionated crystallization behavior of PB-1 within droplets formed by blending PB-1 with an excess of isotactic polypropylene (iPP) employing DSC, SEM, in situ synchrotron WAXD and FT-IR. When PB-1 is dispersed into a large number of small size droplets, the heterogeneous nucleation of Form II crystals can be inhibited because the number of droplets is larger than that of active nucleation sites for Form II (i.e., active heterogeneities originally present in bulk PB-1). The nucleation of the finely dispersed PB-1 droplets does not occur homogenously, but at the interface with the iPP matrix, which induces the crystallization of the droplets into Form I'. The crystallization rate of Form I' at different temperatures was determined by Fourier transform infrared spectroscopy. It was found that trigonal Form I' crystallizes faster when the content of PB-1 in the blend is lower, and the specific interfacial surface area is larger. The opposite effect has been observed for the kinetics of the metastable Form II formation. It is therefore suggested that Form I' crystallization is driven by the nucleation of PB-1 at the crystalline iPP surface, which competes with the crystallization of Form II induced by nucleating heterogeneities present in PB-1 droplets. (C) 2018 Published by Elsevier Ltd.
WOS记录号	WOS:000426264300044
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/38748]
专题	化学研究所_其它
推荐引用方式 GB/T 7714	Wang, Zefan,Dong, Xia,Liu, Guoming,et al. Interfacial nucleation in iPP/PB-1 blends promotes the formation of polybutene-1 trigonal crystals[J]. POLYMER,FEB ,138:396-406.
APA	Wang, Zefan.,Dong, Xia.,Liu, Guoming.,Xing, Qian.,Cavallo, Dario.,...&Wang, Dujin.(FEB ).Interfacial nucleation in iPP/PB-1 blends promotes the formation of polybutene-1 trigonal crystals.POLYMER,138,396-406.
MLA	Wang, Zefan,et al."Interfacial nucleation in iPP/PB-1 blends promotes the formation of polybutene-1 trigonal crystals".POLYMER 138(FEB ):396-406.