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Polymer Bulletin
Published in: Polymer Bulletin 1/2014

01-01-2014 | Original Paper

Synthesis and self-assembly of a new amphiphilic thermosensitive poly(N-vinylcaprolactam)/poly(ε-caprolactone) block copolymer

Authors: Qiuhua Wu, Liping Wang, Xiaofei Fu, Ximing Song, Qi Yang, Guolin Zhang

Published in: Polymer Bulletin | Issue 1/2014

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Abstract

New amphiphilic thermosensitive poly(N-vinylcaprolactam)/poly(ε-caprolactone) (PNVCL-b-PCL) block copolymers were synthesized by ring-opening polymerization of ε-caprolactone with hydroxy-terminated poly(N-vinylcaprolactam) (PNVCL-OH) as a macroinitiator. The structures of the polymers were confirmed by IR, 1H NMR and GPC. The critical micelle concentrations of copolymer in aqueous solution measured by the fluorescence probe technique reduced with the increasing of the proportion of hydrophobic parts, so did the diameter and distribution of the micelles determined by dynamic light scattering. The shape observed by transmission electron microscopy (TEM) demonstrated that the micelles are spherical. On the other hand, the UV–vis measurement showed that polymers exhibit a reproducible temperature-responsive behavior with a lower critical solution temperature (LCST). The LCST of PNVCL-OH can be adjusted by controlling the molecular weights, and that of copolymers can be adjusted by controlling the compositions and the concentration. Variable temperature TEM measurements demonstrated that LCST transition was the result of transition of individual micelles to larger aggregates.
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Metadata
Title
Synthesis and self-assembly of a new amphiphilic thermosensitive poly(N-vinylcaprolactam)/poly(ε-caprolactone) block copolymer
Authors
Qiuhua Wu
Liping Wang
Xiaofei Fu
Ximing Song
Qi Yang
Guolin Zhang
Publication date
01-01-2014
Publisher
Springer Berlin Heidelberg
Published in
Polymer Bulletin / Issue 1/2014
Print ISSN: 0170-0839
Electronic ISSN: 1436-2449
DOI
https://doi.org/10.1007/s00289-013-1041-x

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