Structural effect of a series of block copolymers consisting of poly(N-isopropylacrylamide) and poly(N-hydroxyethylacrylamide) on thermoresponsive behavior

被引：24

作者：

Chen, Yougen ^{[1
]}

Sone, Masako ^{[1
]}

Fuchise, Keita ^{[1
]}

Sakai, Ryosuke ^{[1
]}

Kakuchi, Ryohei ^{[1
]}

Duan, Qian ^{[2
]}

Sun, Jingliang ^{[2
]}

Narumi, Atsushi ^{[3
]}

Satoh, Toshifumi ^{[1
]}

Kakuchi, Toyoji ^{[1
]}

机构：

[1] Hokkaido Univ, Grad Sch Engn, Div Biotechnol & Macromol Chem, Kita Ku, Sapporo, Hokkaido 0608628, Japan

[2] Changchun Univ Sci & Technol, Sch Chem & Environm Engn, Changchun 130022, Peoples R China

[3] Yamagata Univ, Grad Sch Sci & Engn, Dept Polymer Sci & Engn, Yonezawa, Yamagata 9928510, Japan

来源：

REACTIVE & FUNCTIONAL POLYMERS | 2009年 / 69卷 / 07期

关键词：

Atom transfer radical polymerization (ATRP); Diblock copolymer; Triblock copolymer; N-Hydroxyethylacrylamide; N-Isopropylacrylamide; Lower critical solution temperature (LCST); Micelle formation; TRANSFER RADICAL POLYMERIZATION; TEMPERATURE RAFT POLYMERIZATION; CHAIN TRANSFER POLYMERIZATION; N-ISOPROPYLACRYLAMIDE; REVERSIBLE ADDITION; TRIBLOCK COPOLYMERS; WATER; NANOPARTICLES; FABRICATION; POLYMERS;

D O I：

10.1016/j.reactfunctpolym.2008.12.016

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Well-defined diblock and triblock copolymers consisting of poly(N-isopropylacrylamide) (PNIPAM) and poly(N-hydroxyethylacrylamide) (PHEAA) were prepared using the atom transfer radical polymerization (ATRP) method. The number-average molecular weight and fraction of each segment were precisely controllable by adjusting the monomer/initiator ratio in feed. The lower critical solution temperature (LCST) of a series of block copolymers with different compositions was examined using a turbidimetry analysis. The copolymers with a relatively lower molar fraction of HEAA units in the polymer chain exhibited phase transition phenomenon, in which the LCST depended on the fraction in the copolymer. On the other hand, the LCST disappeared for the copolymers with higher HEAA unit molar fractions. The H-1 NMR measurement clarified that the disappearance of the LCST was attributed to the formation of the water-soluble micelle. Furthermore, the thermoresponsive property of the series of block copolymers was elucidated on the basis of the structural effect of the copolymer, which includes the order and length of the block segments. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：463 / 469

页数：7

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