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首页> 外文期刊>Journal of Applied Polymer Science >NMR study of poly(vinylpyrrolidone)/poly(ethylene oxide) blends
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NMR study of poly(vinylpyrrolidone)/poly(ethylene oxide) blends

机译：聚乙烯基吡咯烷酮/聚环氧乙烷混合物的NMR研究

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Development of polymeric blends has become very important for polymer industries because they have been shown to be successful and versatile alternatives to obtain new polymers. In this work binary blends formed by poly(vinylpyrrolidone) (PVP) and poly(ethylene oxide) (PEO) were studied by solution and solid-state NMR to determine their physical interaction, homogeneity, and compatibility for use as membranes to separate water/alcohol. The NMR results allowed us to acquire information on the microstructure and molecular dynamic behavior of polymer blends. From the NMR solution it was possible to evaluate the microstructure: PVP presented a preferential syndiotactic distribution sequence and PEO presented two regions, one crystalline and the other amorphous. Considering the solid-state NMR results it was possible to evaluate the molecular dynamics and all binary blends, showing that PEO behaves as a plasticizer; some intermolecular interaction was also observed. An important point was to evaluate the microstructure of the carbonyl PVP using cross polarization/magicangle spinning (CP/MAS) and CP/MAS/dipolar decoupling that was not observed before. (C) 2002 Wiley Periodicals, Inc. [References: 9]
机译：聚合物共混物的开发对于聚合物行业而言已变得非常重要，因为已证明它们是成功获得新聚合物的通用替代品。在这项工作中，通过溶液和固态NMR研究了由聚乙烯吡咯烷酮（PVP）和聚环氧乙烷（PEO）形成的二元共混物，以确定它们的物理相互作用，均质性和相容性，用作膜分离水/醇。 NMR结果使我们可以获得有关聚合物共混物的微观结构和分子动力学行为的信息。从NMR溶液中可以评估其微观结构：PVP表现出优先的间同分布序列，而PEO表现出两个区域，一个区域为晶体，另一个区域为非晶。考虑到固态NMR结果，可以评估分子动力学和所有二元共混物，表明PEO表现为增塑剂。还观察到一些分子间的相互作用。重要的一点是使用交叉极化/磁纺（CP / MAS）和CP / MAS /偶极解耦来评估羰基PVP的微观结构，这是之前所未见的。 （C）2002 Wiley Periodicals，Inc. [参考：9]

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