Ultrasonic Polymerization of N-Isopropylacrylamide below and above Critical Temperature
Ultrasonic Polymerization of N-Isopropylacrylamide below and above Critical Temperature
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DOI：
10.1143/jjap.49.07he07
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发表时间：
2010-01-01
影响因子：
1.5
通讯作者：
Minagawa, Keiji
中科院分区：
文献类型：
--
作者：
Yanagida, Hirotaka;Umeki, Erika;Minagawa, Keiji
聚（N-异丙基丙烯酰胺）是一种众所周知的热敏聚合物，其在32 ℃下表现出相变。在这里，超声波聚合的单体，N-异丙基丙烯酰胺，在水溶液中被报道为一种新的反应。将N-异丙基丙烯酰胺水溶液超声照射约30分钟产生聚合物。在不同温度和单体浓度下测量聚合物的产率和分子量（M-w）。在15 ℃（低于临界温度）下，反应产率在1小时后没有增加。然而，在33 ℃（高于临界温度）下，即使在超声处理后6小时，聚合仍在继续，产生的产率是在15 ℃下获得的产率的两倍。在33 ℃下获得的聚合物的M-w为5 × 10（4）g/mol，约为15 ℃下的5倍。(C)2010日本应用物理学会
Poly(N-isopropylacrylamide) is a well-known thermosensitive polymer exhibiting a phase transition at 32 degrees C. Here, ultrasonic polymerization of the monomer, N-isopropylacrylamide, in an aqueous solution is reported as a novel reaction. Ultrasound irradiation of an N-isopropylacrylamide aqueous solution for approximately 30 min produced the polymer. The yield and molecular weight (M-w) of the polymer were measured for various temperatures and monomer concentrations. At 15 degrees C (below the critical temperature), the reaction yield did not increase after 1 h. At 33 degrees C (above the critical temperature), however, polymerization continued even 6 h after sonication, producing twice the yield obtained at 15 degrees C. The M-w of the polymer obtained at 33 degrees C was 5 x 10(4) g/mol, approximately five times that at 15 degrees C. (C) 2010 The Japan Society of Applied Physics