中文摘要：

采用自由基溶液聚合法合成聚（N,N-二乙基丙烯酰胺-co-N-丙烯酸琥珀酰亚胺）（P（DEAM-co-NAS））共聚比为7.9∶1、3.5∶1、2.5∶1、2∶1、1.5∶1的五组共聚物.利用傅里叶变换红外（FTIR）光谱和核磁共振（1HNMR）谱对P（DEAM-co-NAS）结构进行表征.共聚物组成和介质性质对P（DEAM-co-NAS）水溶液温敏性有显著影响.结果表明：随着NAS含量增加,共聚物水溶液的低临界溶解温度（LCST）逐渐升高,温敏性降低;盐的引入使P（DEAM-co-NAS）水溶液的LCST降低,所引入盐的阴离子价数越高,影响程度越大;有机酸的引入使P（DEAM-co-NAS）水溶液的LCST降低;NaOH、乙二胺、丁二胺的引入使P（DEAM-co-NAS）水溶液的LCST升高,二胺对P（DEAM-co-NAS）水溶液温敏性影响程度要大于NaOH.

英文摘要：

Poly（N,N-diethylacrylamide-co-N-acryloxysuccinimide） （P（DEAM-co-NAS）） was synthesized by free radical solution polymerization and copolymerization ratios of 7.9∶1, 3.5∶1, 2.5∶1, 2∶1, 1.5∶1 were used. The copolymer structures were characterized by Fourier transform infrared （FTIR） spectrometry and nuclear magnetic resonance （1H NMR）. The copolymer compositions and the properties of the medium environment largely influence the temperature sensitivities of the P（DEAM-co-NAS） aqueous solutions. The lower critical solution temperature （LCST） of the P（DEAM-co-NAS） aqueous solution increased with an increase in the NAS content. The addition of salts resulted in a linear decrease in the LCST of the P（DEAM-co-NAS） aqueous solution and this depended on the anion valence of the salts. The addition of organic acids can reduce the LCST of the P（DEAM-co-NAS） aqueous solution. Moreover, the addition of NaOH, ethylenediamine, and putrescine leads to an increase in the LCST of the P（DEAM-co-NAS） aqueous solution. The effects of ethylenediamine and putrescine on the LCST of the P（DEAM-co-NAS） aqueous solution were greater than that of NaOH.