作　　者： ; ;

机构地区： 华南理工大学材料科学与工程学院材料科学研究所

出　　处： 《华南理工大学学报（自然科学版）》 1994年第6期8-13,共6页

摘　　要： 为了探讨聚（Ｎ－异丙基丙烯酰胺）的凝聚态结构，在水和丙酮／苯两种介质中采用自由基聚合合成了聚（Ｎ－异丙基丙烯酰胺）简称ＰＮＩＰＡ。ＧＰＣ表明两种ＰＮＩＰＡ的分子量均为单一分布，Ｍｗ分别为１２９０００和５５９００（以聚苯乙烯为标样）。ＦＴ—ＩＲ证明酰胺基没有被水解。Ｘ射线和ＤＳＣ表明，核聚合物的凝聚态结构中由于异丙基和氢键的共同作用，聚合物基本呈无定形态，Ｔｇ为４０７Ｋ，热降解温度达３９５Ｋ，分析Ｘ射线和ＩＲ的结果发现，ＰＮＩＰＡ分子链排列有一定的序度，建议采用仲晶模型来描述。另外，聚合物中氢键的强弱及Ｘ射线衍射强度还与制样方法有关。 The poly (N-isopropyl acrylamide) (PNIPA) samples were prepared byfree radical polymerhation in water and in acetone/benzene respectively. The GPCshows that both polymer samples .obtained from the above two media have singledistribution peak with molecular weight, M. of 129 000 and 55 900 respectively (usingpolystyrene as the standard). FT-IR confirmed by the amide groups did not hydrolyzeduring the polymerhation. X-ray diffraction and DSC reveal that due to both effectsof hydrophobic isopropyl groups and hydrogen bonds at amide group, the polymer isin the amorphous state (Tg≈ 407K). The results of X-ray diffraction and IRsuggest that the moleCular chainS of PNIPA would condense with someWhat orderstate suitable to be fit by the paracrystalline model. Besides, the strength of hydrogenbond and diffraction pattern are correlated somewhat with the sample-preparingmethod.

关 键 词： 高聚物 凝聚态 聚丙烯酰胺

领　　域： [理学] [理学] [化学工程]