✦ LIBER ✦

Phase Transition and Phase Transformation in Block Copolymer Nanoparticles

✍ Scribed by Takeshi Higuchi; Kiwamu Motoyoshi; Hidekazu Sugimori; Hiroshi Jinnai; Hiroshi Yabu; Masatsugu Shimomura

Publisher: John Wiley and Sons
Year: 2010
Tongue: English
Weight: 459 KB
Volume: 31
Category: Article
ISSN: 1022-1336
DOI: 10.1002/marc.201000299

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✦ Synopsis

Abstract

Block copolymer nanopaticles were prepared from the mixture solutions containing good/poor solvents by a simple evaporation process. The block copolymers formed disorder, unidirectionally stacked lamellar, and onion‐like structures in nanoparticles depending on preparation temperatures. Thermal annealing induced the disorder‐order phase transition and order‐order phase transformation in the block copolymer nanoparticles, even though the annealing temperature is lower than the of one polymer segment. The unusual thermal behaviors suggest that the glass transition temperature of the block copolymer is decreased by the effect of nanoparticle, whose surface areas are larger than their volumes.

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