聚乙烯吡咯烷酮与十二烷基甜菜碱相互作用的NMR研究
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摘要
通过~1H NMR化学位移法测定十二烷基甜菜碱(C_(12)BE)与不同浓度的聚乙烯吡咯烷酮(PVP)混合体系的临界聚集浓度(cac)与聚集饱和浓度(C2)值;通过弛豫时间研究了PVP对C_(12)BE分子运动的影响。结果表明;随PVP的含量增加,cac与C2值增大,C_(12)BE分子运动受限越严重。从而推断PVP与C_(12)BE发生了一定的相互作用导致C_(12)BE的分子运动性发生改变,其主要驱动力为静电效应。
The critical aggregation concentration(cac) and the adsorption reached saturated concentration(C2) values of Dodecyl Dimethyl Betaine(C_(12)BE) with different concentration of Polyvinylpyrrolidone(PVP) had been studied by ~1H NMR.The measurements of relaxation time showed that different content of PVP had different influences on the motion of C_(12)BE molecular.The more content of PVP is,the more limited of C_(12)BE molecular motion is.It can be seen that the change of the C_(12)BE molecular motion because of the interaction between PVP and C_(12)BE,and the electrostatic interaction was considered to be the leading driving force.
The critical aggregation concentration(cac) and the adsorption reached saturated concentration(C2) values of Dodecyl Dimethyl Betaine(C_(12)BE) with different concentration of Polyvinylpyrrolidone(PVP) had been studied by ~1H NMR.The measurements of relaxation time showed that different content of PVP had different influences on the motion of C_(12)BE molecular.The more content of PVP is,the more limited of C_(12)BE molecular motion is.It can be seen that the change of the C_(12)BE molecular motion because of the interaction between PVP and C_(12)BE,and the electrostatic interaction was considered to be the leading driving force.
引文
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