NDLI: The βα growth transition of isotactic polypropylene during stepwise crystallization at elevated temperature

Content Provider	Springer Nature Link
Author	Wang, Jiying Ren, Zhongjie Sun, Xiaoli Li, Huihui Yan, Shouke
Copyright Year	2015
Abstract	Growth transition from β-isotactic polypropylene (iPP) to its α phase during the stepwise crystallization process is investigated. β-iPP hexagonites and spherulites are prepared first at 135 °C by using pimelic calcium as a nucleation agent, and transformation of them to their α-counterparts is realized by continuous isothermal crystallization at elevated temperatures, e.g., 151 °C. The β to α growth transition regions are investigated by optical and scanning electron microscopies. The results show that β-iPP hexagonites and spherulites grow in thin and thick films, respectively, while α-iPP spherulites are always observed in both thin and thick films. After abrupt temperature jump from 135 to 151 °C, α-iPP spherulites grow continuously with edge-on lamellae extending smoothly from the region crystallized at 135 °C to the area grown at 151 °C. On the contrary, the growth of the β-iPP crystals stops. At the growth front of β-iPP crystals, α-iPP crystallization takes place via nucleation and subsequent crystal growth, leading to sporadically dispersed α-iPP crystals around the growth front of β-iPP crystals. The similar structure of the transformed α-iPP crystals with that produced directly by isothermal crystallization at 151 °C also supports this conclusion. Moreover, the same cross-hatched lamellar structure of α-iPP in contact with both the flat-on and edge-on β-iPP lamellae demonstrates that there is no fixed structure relationship between the newly formed α- and the original β-iPP crystals.
Starting Page	2823
Ending Page	2830
Page Count	8
File Format	PDF
ISSN	0303402X
Journal	Colloid and Polymer Science
Volume Number	293
Issue Number	10
e-ISSN	14351536
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-07-07
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Polypropylene Stepwise crystallization Growth transition Structure Morphology Polymer Sciences Soft and Granular Matter, Complex Fluids and Microfluidics Characterization and Evaluation of Materials Physical Chemistry Food Science Nanotechnology and Microengineering
Content Type	Text
Resource Type	Article
Subject	Colloid and Surface Chemistry Materials Chemistry Physical and Theoretical Chemistry Polymers and Plastics

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