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29-08-2015 | Original Paper

Crystallization and morphology transition of P2VP-b-PEO block copolymer micelles composed of an amorphous core and a crystallizable corona

Authors: Tinghua Wang, Xiaokai Zhang, Xue Li, Xinkang Gao, Lianlian Song

Published in: Polymer Bulletin | Issue 3/2016

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Abstract

In this paper, the crystallization of poly(2-vinyl pyridine)-block-poly(ethylene oxide) (P2VP-b-PEO) block copolymer micelles with an amorphous P2VP core and crystallizable PEO corona upon cooling in n-amyl acetate/n-butanol (NAA/BOL) mixed solvent was investigated. The micellar solutions of the block copolymers were quenched from 65 to −33 °C first and then to the crystallization temperature −3 °C. Transmission electron microscopy was used to observe the morphological changes of the block copolymers. The influence of the solubility or chain mobility of the P2VP core on the formation of square crystals was investigated. Square crystals of uniform size and shape in large quantities could be obtained. The crystals are composed of PEO single-crystal layer sandwiched between two P2VP layers tethered on the top and bottom basal surfaces. The crystallization mechanism that spherical micelles transform into squared crystals is discussed.

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Title: Crystallization and morphology transition of P2VP-b-PEO block copolymer micelles composed of an amorphous core and a crystallizable corona
Authors: Tinghua Wang
Xiaokai Zhang
Xue Li
Xinkang Gao
Lianlian Song
Publication date: 29-08-2015
Publisher: Springer Berlin Heidelberg
Published in: Polymer Bulletin / Issue 3/2016
Print ISSN: 0170-0839
Electronic ISSN: 1436-2449
DOI: https://doi.org/10.1007/s00289-015-1519-9

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