The influence of PEG macromonomers on the size and properties of thermosensitive aqueous microgels
The influence of PEG macromonomers on the size and properties of thermosensitive aqueous microgels
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DOI：
10.1007/s00396-008-1972-1
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发表时间：
2009-03
影响因子：
2.4
通讯作者：
A. Pich;S. Berger;O. Ornatsky;V. Baranov;M. Winnik
中科院分区：
文献类型：
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作者：
A. Pich;S. Berger;O. Ornatsky;V. Baranov;M. Winnik
我们描述了基于聚（N-乙烯基己内酰胺）含有接枝聚（乙二醇）（PEG）链的水微凝胶的制备和热响应。这些微凝胶是由乙烯基己内酰胺和甲基丙烯酸乙酰乙酰氧基乙酯在甲氧基封端的聚（乙二醇）甲基丙烯酸酯大分子单体的存在下通过自由基共聚而合成的。我们表明，PEG大分子单体的量或PEG链的长度的变化提供了在60-220 nm的范围内的微凝胶直径的有效控制。接枝PEG链的存在改善了微凝胶的胶体稳定性。将PEG大分子单体掺入微凝胶结构中降低了溶胀度，并诱导体积相变向更高温度的转变。
We describe the preparation and thermal response of aqueous microgels based on poly(N-vinyl caprolactam) containing grafted poly(ethylene glycol) (PEG) chains. These microgels were synthesized by free radical copolymerization of vinyl caprolactam and acetoacetoxyethyl methacrylate in the presence of methoxy-capped poly(ethylene glycol)methacrylate macromonomers. We show that variation of the amount of PEG macromonomer or the length of the PEG chain provides effective control of the microgel diameter in the range 60–220 nm. The presence of the grafted PEG chains improves the colloidal stability of the microgels. The incorporation of the PEG macromonomers into microgel structure decreases the swelling degree and induces a shift of the volume phase transition to higher temperatures.