Single crystals of crystalline block copolymers formed in n‐hexanol and methanol/DMF solutions: A comparative study

ABSTRACT Lamellar single crystals of poly(ɛ‐caprolactone) (PCL)‐based crystalline/liquid‐crystalline block copolymer (BCP) were prepared from two methods: solution crystallization in n‐hexanol as well as addition of methanol dropwise to BCP/DMF solution. The crystalline morphologies of PCL single cr...

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Bibliographic Details
Published in:Journal of applied polymer science 2017-08, Vol.134 (29), p.np-n/a
Main Authors: Zhuo, Wangqian, Li, Yanming, Zhang, Runke, Huang, Runsheng, Zhou, Jie, Tong, Zaizai, Jiang, Guohua
Format: Article
Language:English
Subjects:
Block copolymers
copolymers
Crystal structure
Crystallization
Materials science
Melting
Methyl alcohol
micelles
Nanostructure
Polymers
Seeds
self‐assembly
Single crystals
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Summary:ABSTRACT Lamellar single crystals of poly(ɛ‐caprolactone) (PCL)‐based crystalline/liquid‐crystalline block copolymer (BCP) were prepared from two methods: solution crystallization in n‐hexanol as well as addition of methanol dropwise to BCP/DMF solution. The crystalline morphologies of PCL single crystals prepared at different temperatures were investigated. It was observed that well‐developed single crystals were formed in n‐hexanol at high crystallization temperatures, while low crystallization temperatures favored to fabricate well‐developed nanosheets in methanol/DMF. Annealing at the melting temperature of single crystals yielded the crystalline seeds and unimers in n‐hexanol, while it formed spherical micelles in methanol/DMF system. As a result, the size of single crystals in n‐hexanol could be tuned by addition of different ratios of unimer/seed. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45089.
ISSN:0021-8995
1097-4628
DOI:10.1002/app.45089