Molecular Characteristics of Poly(N-isopropylacrylamide) Separated from Nanocomposite Gels by Removal of Clay from the Polymer/Clay Network

被引：50
作者：
Haraguchi, Kazutoshi [1 ]
Xu, Yingjia [1 ,2 ]
Li, Guang [2 ]
机构：
[1] Kawamura Inst Chem Res, Mat Chem Lab, Chiba 2850078, Japan
[2] Donghua Univ, Coll Mat Sci & Engn, Shanghai 201620, Peoples R China
来源：
MACROMOLECULAR RAPID COMMUNICATIONS | 2010年 / 31卷 / 08期
关键词：
clay; hybrid; hydrogels; nanocomposite; poly(N-isopropylacrylamide); TO-GLOBULE TRANSITION; MECHANICAL-PROPERTIES; HYDROGELS; PNIPA; PARTICLES; WATER;
D O I：
10.1002/marc.200900819
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
The extraordinary mechanical and swelling/deswelling properties of nanocomposite (NC) gels are attributed to their unique organic (polymer)/inorganic (clay) network structure. In this study, poly(N-isopropylacrylamide) (PNIPA) was successfully separated from an NC gel network by decomposing the clay (hectorite) using hydrofluoric acid (HF). A very low HF concentration (0.2 wt.-%) was adequate for the decomposition of the clay without causing any damage to PNIPA. The separated PNIPA had a high (M) over bar (w) (=5.5 x 10(6) g . mol(-1)). Also, (M) over bar (w) was almost constant regardless of the clay concentration (C(clay) = 1-25 x 10(-2) mol . l(-1)), even though the properties of the NC gel varied widely over this C(clay) range. Comparisons of NC gels, PNIPA, and SiO(2)-NC gels indicated that the clay platelets specifically play an important role in NC gels.
引用
收藏
页码：718 / 723
页数：6
相关论文
共 23 条
[1]   Double-network hydrogels with extremely high mechanical strength [J].
Gong, JP ;
Katsuyama, Y ;
Kurokawa, T ;
Osada, Y .
ADVANCED MATERIALS, 2003, 15 (14) :1155-+
[2]   Mechanism of forming organic/inorganic network structures during in-situ free-radical polymerization in PNIPA-clay nanocomposite hydrogels [J].
Haraguchi, K ;
Li, HJ ;
Matsuda, K ;
Takehisa, T ;
Elliott, E .
MACROMOLECULES, 2005, 38 (08) :3482-3490
[3]   Effects of clay content on the properties of nanocomposite hydrogels composed of poly(N-isopropylacrylamide) and clay [J].
Haraguchi, K ;
Takehisa, T ;
Fan, S .
MACROMOLECULES, 2002, 35 (27) :10162-10171
[4]   Mechanical properties and structure of polymer-clay nanocomposite gels with high clay content [J].
Haraguchi, K ;
Li, HJ .
MACROMOLECULES, 2006, 39 (05) :1898-1905
[5]   Control of the coil-to-globule transition and ultrahigh mechanical properties of PNIPA in nanocomposite hydrogels [J].
Haraguchi, K ;
Li, HJ .
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 2005, 44 (40) :6500-6504
[6]   Reversible force generation in a temperature-responsive nanocomposite hydrogel consisting of poly(N-isopropylacrylamide) and clay [J].
Haraguchi, K ;
Taniguchi, S ;
Takehisa, T .
CHEMPHYSCHEM, 2005, 6 (02) :238-241
[7]   Compositional effects on mechanical properties of nanocomposite hydrogels composed of poly(N,N-dimethylacrylamide) and clay [J].
Haraguchi, K ;
Farnworth, R ;
Ohbayashi, A ;
Takehisa, T .
MACROMOLECULES, 2003, 36 (15) :5732-5741
[8]  
Haraguchi K, 2002, ADV MATER, V14, P1120, DOI 10.1002/1521-4095(20020816)14:16<1120::AID-ADMA1120>3.0.CO
[9]  
2-9
[10]   Tunable optical and swelling/deswelling properties associated with control of the coil-to-globule transition of poly(N-isopropylacrylamide) in polymer-clay nanocomposite gels [J].
Haraguchi, Kazutoshi ;
Li, Huan-Jun ;
Song, Liyuan ;
Murata, Kazutaka .
MACROMOLECULES, 2007, 40 (19) :6973-6980
123