热敏多聚物及其单体的合成

SYNTHESIS OF A THERMALLY SELGITIVE POLYMER AND ITS MONOMERS

合成一种热敏性水凝胶及两个重要单体，Ｎ－正丙基丙烯酰胺（ＮＮＰＡ）和Ｎ－异丙基丙烯酰胺（ＮＩＰＡ）．测定单体的物理化学性质、元素组成和红外（ＩＲ）光谱。ＮＮＰＡ和ＮＩＰＡ的合成产率分别为６Ｏ％和７２％，测定聚Ｎ－异基丙烯酰胺（ＰＮＩＰＡ）水凝胶的溶胀性能，其溶胀和消溶胀过程是可逆和对温度敏感的。ＰＮＩＰＡ热敏水凝胶的临界相变温度（或称低临界溶解温度ＬＣＳＴ）为３３～３５℃，平衡溶胀比为２５～３０倍。

A kind of thermally sensitivehydrogels and two important monomers,N-n-propyl acrylamide(NNPA)and N-isopopyl acrylamide(NIPA),were synthesized.A 60%yield of NNPA and a 72% yield of NIPA wene obtained The two monomeric compounds were studied by elementalanalysis and their physicochemical properties The equilibrium swlling characteristics of the poly- N- isopropylacrylamide(PNIPA)hydrogel were determined,Its swelling and deswelling processes arethermally reversible,This thermally reversible gel has a phase transitiontemperature or a lower critical solution temperature(LCST)at the range of 33℃ to 35℃,Its swelling ratios around LCST are between 25to 30 times.