含叔胺基功能性单体的聚合研究——ⅩⅤⅠ.含吗啉基聚丙烯酸酯类及其水凝胶的温度敏感性

我们曾报道过含吗啉基丙烯酰类单体在过氧化物或芳酮存在下的热聚合及光聚合,以及做为氧化-还原引发体系组分引发烯类单体聚合的研究。利用这类单体与过硫酸盐所构成的引发体系可以获得分子量达千万的聚丙烯酰胺。实验中还发现某些含吗啉基的丙烯酸酯类聚合物的水溶液及其水凝胶具有温度敏感性。本文合成了以下四种含吗啉基丙烯酸酯类单体:

STUDIES ON THE POLYMERIZATION OF FUNCTIONAL MONOMERS CONTAINING AMINO-GROUP XVI. Thermo-Sensitive Character of Polyacrylates Having Morpholono-Moiety and Their Hydrogels

Some acrylates having morpholino-moiety were synthesized and polymerized either in bulk or equeous solution by the initiation of AIBN or potassium persulfate. Studies on the change of transparency at various temperature revealed that, both Poly(morpholinoethyl methacrylate) P(MPEMA) and its slightly crosslinked hydrogel displayed remarkably thermosensitive character, and the thermo-sensitivity relied heavily upon temperature, pH value of medium and the degree of crosslinking. Such change of transparency was attributed to the microphase sepera-tion of polymers or hydrogels.