A novel thermosensitive polymer, poly(methyl 2-propionamidoacrylate), with geminal substituents
A novel thermosensitive polymer, poly(methyl 2-propionamidoacrylate), with geminal substituents
复制标题
一种新型热敏聚合物，具有孪位取代基的聚（2-丙酰胺基丙烯酸甲酯）
DOI：
10.1016/s0032-3861(02)00186-6
复制
发表时间：
2002
期刊：
影响因子：
4.6
通讯作者：
Masami Tanaka
中科院分区：
文献类型：
--
作者：
H. Okamura;Takeshi Mori;K. Minagawa;S. Masuda;Masami Tanaka
制备了一种新型热敏聚合物聚2-丙酰丙烯酸甲酯（PMPA），并研究了其在水溶液中的相变行为。PMPA在每个单体单元上都有丙酰胺和甲氧基羰基的双取代基。结果表明，PMPA在50.6℃时显著降低临界溶解温度（LCST）。在聚合物浓度高于40g/l时，PMPA的LCST几乎与聚合物浓度无关，而在聚合物浓度低于40g/l时，LCST随聚合物浓度的增加而降低。研究了不同盐（NaCl、NaBr和Na2SO4）对LCST的影响。随着各盐浓度的增加，PMPA的LCST呈线性降低。这些盐的盐析效果符合Hofmeister系列：Na2SO4>NaCl>NaBr。
A novel thermosensitive polymer, poly(methyl 2-propionamidoacrylate) (PMPA), was prepared and the phase transition behavior in an aqueous solution was studied. PMPA have geminal substituents of propionamide and methoxy carbonyl in each monomer unit. It was found that PMPA shows the lower critical solution temperature (LCST) at 50.6°C sharply. The LCST of PMPA was almost independent of the polymer concentration above 40g/l, while, below 40g/l, it decreased with the increasing polymer concentration. The effect of salt addition (NaCl, NaBr, and Na2SO4) on the LCST was also studied. The LCST of PMPA linearly decreased with the increasing concentration of each salt. The salting-out effect of these salts was in line with the Hofmeister series: Na2SO4>NaCl>NaBr.