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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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P(NIPAM-co-NVP)共聚物分子链水溶液中的可逆聚集研究
DOI: 10.3724/SP.J.1105.2011.10234, PP. 766-771
Keywords: 聚(N-异丙基丙烯酰胺-co-N-乙烯基吡咯烷酮),可逆聚集,弹性光散射,荧光光谱
Abstract:
用溶液聚合方法合成了线型聚(N-异丙基丙烯酰胺-co-N-乙烯基吡咯烷酮)共聚物,通过弹性光散射(elasticlightscattering,ELS)、荧光光谱与动态光散射研究了共聚物水溶液分子链可逆聚集的温度和时间依赖性.研究表明,升温时,ELS强度增加,分子链聚集;降温时,ELS强度降低,聚集的分子链解离.荧光光谱研究表明,分子链在升温时发生了疏水缔合相互作用,从而使得分子链聚集体荧光强度增加,降温时分子链发生解离,使荧光强度减弱.动态光散射测得升温时聚合物的平均流体力学半径在最低临界溶解温度(LCST)时急剧增大,而后减小,降温过程的变化与升温相反.此外,从弹性光散射容易得出,共聚物因含有亲水性NVP而使其LCST高于PNIPAM均聚物.可见,通过弹性光散射、荧光光谱和动态光散射得到的共聚物分子链在水溶液中的可逆聚集行为是一致的.
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