FAST RESPONSIVE THERMOSENSITIVE POLY(N-ISOPROPYLACRYLAMIDE) HYDROGELS Ⅰ. SYNTHESIS, CHARACTERIZATION AND KINETIC BEHAVIOR

LIU Xiaohua; WANG Xiaogong; LIU Deshan

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FAST RESPONSIVE THERMOSENSITIVE POLY(N-ISOPROPYLACRYLAMIDE) HYDROGELS Ⅰ. SYNTHESIS, CHARACTERIZATION AND KINETIC BEHAVIOR

Research Article | 更新时间：2021-03-19

- FAST RESPONSIVE THERMOSENSITIVE POLY(N-ISOPROPYLACRYLAMIDE) HYDROGELS Ⅰ. SYNTHESIS, CHARACTERIZATION AND KINETIC BEHAVIOR
- Acta Polymerica Sinica Issue 3, Pages: 354-357(2002)
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- Published：20 June 2002，
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LIU Xiaohua, WANG Xiaogong, LIU Deshan. FAST RESPONSIVE THERMOSENSITIVE POLY(N-ISOPROPYLACRYLAMIDE) HYDROGELS Ⅰ. SYNTHESIS, CHARACTERIZATION AND KINETIC BEHAVIOR. [J]. Acta Polymerica Sinica (3):354-357(2002)
DOI：

LIU Xiaohua, WANG Xiaogong, LIU Deshan. FAST RESPONSIVE THERMOSENSITIVE POLY(N-ISOPROPYLACRYLAMIDE) HYDROGELS Ⅰ. SYNTHESIS, CHARACTERIZATION AND KINETIC BEHAVIOR. [J]. Acta Polymerica Sinica (3):354-357(2002) DOI：

摘要

以不同粒径的CaCO3粒子为成孔剂

合成了快速响应的温敏性聚 (N 异丙基丙烯酰胺 ) (PNIPA)水凝胶 .利用扫描电镜观察到水凝胶具有特殊的孔状结构

得到水凝胶的孔径大小为几十微米左右 .动力学研究表明

该水凝胶在温敏膨胀或收缩时

具有快速的响应速率

在 10min内的失水率可达 90% .比较了干凝胶和40℃下失水后的凝胶两种不同状态下水凝胶的膨胀曲线

发现两者的溶胀动力学曲线明显不同

前者的曲线有拐点 .同时发现与失水收缩速率相比

水凝胶具有较慢的吸水膨胀速率 .

Abstract

Fast responsive thermosensitive PNIPA hydrogels were synthesized by using different meshes of CaCO3 particles as pore-foaming agent．From the observation by a scanning electron microscope

it was found that these gels consisted of a porous structure．The gels possess pores in the size range 10～100μm．Such porous hydrogels swelled or shrank much faster in response to the change of temperature than conventional hydrogels．More than 90％ of water could be expelled from the porous hydrogels within 10 min when the temperature of the hydrogels was raised to 40℃. The reswelling curve of the xeogel was compared with the reswelling curve of the hydrogel shrunk to equilibrium state at 40℃

which showed a significant difference and an inflexion was found in the former．In comparing with the shrinking-rate

the swelling-rate of the porous hydrogels is relatively slower．

关键词

N异丙基丙烯酰胺孔状结构快速响应动力学水凝胶

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浙江科技学院环境与资源学院

浙江大学高分子科学与工程学系高分子功能构造与合成教育部重点实验室

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