Novel reversible thermoresponsive nanogel based on poly(ionic liquid)s prepared via RAFT crosslinking copolymerization
Novel reversible thermoresponsive nanogel based on poly(ionic liquid)s prepared via RAFT crosslinking copolymerization
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DOI：
10.1002/pola.27789
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
Y. Zuo;Na Guo;Zhenqian Jiao;Pengfei Song;Xiaojun Liu;Rongmin Wang;Y. Xiong
中科院分区：
文献类型：
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作者：
Y. Zuo;Na Guo;Zhenqian Jiao;Pengfei Song;Xiaojun Liu;Rongmin Wang;Y. Xiong
在这项研究中，一个简单的战略，通过可逆的加成-断裂转移（RAFT）交联共聚的离子液体为基础的单体的制备温度和pH值响应的纳米凝胶被证明。在RAFT聚合中使用含羧基的链转移剂（CTA）是制备高度温敏纳米凝胶的关键。实验结果表明，所制备的纳米凝胶的临界凝胶化温度可以通过调节单体和CTA的投料比来调节。变温傅里叶变换红外光谱测量和控制实验表明，CTA的羧基之间的氢键相互作用是负责聚（离子液体）（PIL）基纳米凝胶的温度响应行为。此外，PIL基纳米凝胶也被发现是pH敏感的，并可以进一步修饰聚（N-异丙基丙烯酰胺）（PNIPAAm）通过表面接枝聚合。PNIPAAm接枝的纳米凝胶水溶液可以在温度变化时可逆地转化为大凝胶。© 2015 Wiley Periodicals，Inc. J.波利姆科学，A部分：聚合物化学2015
In this study, a facile strategy for the preparation of thermo- and pH-responsive nanogels through reversible addition–fragmentation transfer (RAFT) crosslinking copolymerization of ionic liquid-based monomers is demonstrated. The use of chain transfer agents (CTAs) containing carboxyl group in the RAFT polymerizations is the key to producing highly thermoresponsive nanogels. Experimental results demonstrate that the critical gelation temperature of the as-prepared nanogels can be tuned by adjusting the feed ratio of monomer and CTA. Variable temperature Fourier transform infrared measurements and control experiments indicate that hydrogen-bonding interactions between the carboxyl groups of CTAs are responsible for the thermoresponsive behaviors of poly(ionic liquid) (PIL)-based nanogels. Furthermore, PIL-based nanogels are also found to be pH-sensitive, and can be further decorated by poly(N-isopropylacrylamide) (PNIPAAm) via surface grafting polymerization. PNIPAAm-grafted nanogel aqueous solutions can be reversibly transformed into macrogels upon a change in temperature. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2015