Effect of alkyl substituents structures and added ions on the phase transition of polymers and gels prepared from methyl 2‐alkylamidoacrylates
Effect of alkyl substituents structures and added ions on the phase transition of polymers and gels prepared from methyl 2‐alkylamidoacrylates
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烷基取代基结构和添加离子对2-烷基酰胺基丙烯酸甲酯制备的聚合物和凝胶相变的影响
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
Masami Tanaka
中科院分区：
文献类型：
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作者：
Takeshi Mori;M. Hamada;Toru Kobayashi;H. Okamura;K. Minagawa;S. Masuda;Masami Tanaka
研究了烷基结构的改变和离子的加入对新型温敏聚合物系列聚（2-烷基酰胺基丙烯酸甲酯）溶液的影响。热敏聚合物的潜在优点是其独特的α，α-二取代结构导致其功能化简单和转变温度控制。聚2-丙酰胺基丙烯酸甲酯（PMPA）和聚2-异丁酰胺基丙烯酸甲酯（PMIBA）是温敏聚合物，聚2-乙酰氨基丙烯酸甲酯和聚2-正丁酰胺基丙烯酸甲酯分别是完全水溶性和不溶性的。PMIBA溶液在相变过程中表现出吸热现象，而PMPA溶液则没有吸热现象。两种聚合物之间的差异是由疏水基团的大小引起的。通过与N，N′-亚甲基双丙烯酰胺共聚制备了MPA凝胶，该凝胶的温度诱导体积变化是连续的。无机离子对PMPA溶液和凝胶的盐析作用均服从Hofmeister系列。无机离子（I-和SCN-）和有机离子（nPr 4 N+和nBu 4 N+），表现出盐溶效应，直接与PMPA链相互作用。这些离子拓宽了PMPA溶液的相变温度范围。这种相变协同性的降低是由于离子与聚合物的相互作用导致协同畴的尺寸减小所致。© 2005 Wiley Periodicals，Inc.聚合物科学杂志A部分：聚合物化学43：4942-4952，2005
The effects of structure alteration of alkyl groups and addition of ions to solutions of new thermosensitive polymer series of poly(methyl 2-alkylamidoacrylate)s were investigated. Potential advantages of the thermosensitive polymers are their simplicity of functionalization and transition temperature control that result from their unique α,α-disubstituited structures. Poly(methyl 2-propionamidoacrylate) (PMPA) and poly(methyl 2-isobutyracrylate) (PMIBA) were thermosensitive polymers, and poly(methyl 2-acetamidoacrylate) and poly(methyl 2-n-butyramidoacrylate) were completely water-soluble and -insoluble, respectively. The PMIBA solution showed endotherm during the phase transition, while endotherm was not detected for PMPA. The difference between the two polymers resulted from the size of the hydrophobic groups. MPA gel was prepared by copolymerization with N,N′-methylenebis(acrylamide) and temperature-induced volume change of the gel was continuous. The salting-out effect of inorganic ions on PMPA solution and MPA gel followed the Hofmeister series. The inorganic (I− and SCN−) and organic ions (nPr4N+ and nBu4N+), which showed the salting-in effect, were indicated to directly interact with PMPA chains. These ions widened the temperature range of the phase transition of the PMPA solutions. This reduced cooperativity of the phase transition was caused by size decrease of cooperative domains, which resulted from the interaction of the ions with the polymer. © 2005 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 43: 4942–4952, 2005
影响因子：
15
作者：
Hribar, B;Southall, NT;Dill, KA
通讯作者：
Dill, KA