The alpha beta-iPP growth transformation of commercial-grade iPP during non-isothermal crystallization

	The alpha beta-iPP growth transformation of commercial-grade iPP during non-isothermal crystallization
	Zhou, Zhenzhen 1; Zhou, Qian 2,3; Ren, Zhongjie 1; Sun, Xiaoli 1; Li, Huayi 2,3; Li, Huihui 1; Yan, Shouke 1
刊名	CRYSTENGCOMM
	2015
卷号	17 期号:47 页码:9221-9227
英文摘要	In the present study, the crystallization of commercial-grade isotactic polypropylene (iPP) was studied by optical microscopy, scanning electron microscopy (SEM) and wide-angle X-ray diffraction (WAXD). It was found that isothermal crystallization of used iPP at 135 degrees C leads to the formation of pure alpha-iPP crystals. During non-isothermal crystallization at a cooling rate of 10 degrees C min(-1), growth transformation of alpha into beta-iPP occurs at the growth front of alpha-iPP spherulites. This is not common and has only been found during crystallization in a temperature gradient. The observed alpha beta-iPP growth transformation is confirmed to be a result of the existence of some impurities, which exhibited their ability to nucleate beta-iPP. The ability of the impurities to nucleate beta-iPP is dependent on concentration and temperature. Therefore, interlamellar rejection of the impurities caused by fast cooling (40 degrees C min(-1)) cannot induce the alpha beta-iPP growth transformation. On the other hand, even though isothermal crystallization of iPP at 135 degrees C can result in the accumulation of impurities at the spherulite growth front, it still cannot induce the alpha beta-iPP growth transformation at a low concentration.
收录类别	SCI
语种	英语
公开日期	2016-01-12
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/29346]
专题	化学研究所_工程塑料实验室
作者单位	1.Beijing Univ Chem Technol, State Key Lab Chem Resource Engn, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Coll Chem & Chem Engn, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Inst Chem, CAS Key Lab Engn Plast, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Zhou, Zhenzhen,Zhou, Qian,Ren, Zhongjie,et al. The alpha beta-iPP growth transformation of commercial-grade iPP during non-isothermal crystallization[J]. CRYSTENGCOMM,2015,17(47):9221-9227.
APA	Zhou, Zhenzhen.,Zhou, Qian.,Ren, Zhongjie.,Sun, Xiaoli.,Li, Huayi.,...&Yan, Shouke.(2015).The alpha beta-iPP growth transformation of commercial-grade iPP during non-isothermal crystallization.CRYSTENGCOMM,17(47),9221-9227.
MLA	Zhou, Zhenzhen,et al."The alpha beta-iPP growth transformation of commercial-grade iPP during non-isothermal crystallization".CRYSTENGCOMM 17.47(2015):9221-9227.