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首页> 外文期刊>Journal of Applied Polymer Science >ESR STUDIES OF CHEMICALLY MODIFIED AND PHOTOCROSSLINKED POLY(VINYL ALCOHOL) GELS
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ESR STUDIES OF CHEMICALLY MODIFIED AND PHOTOCROSSLINKED POLY(VINYL ALCOHOL) GELS

机译：化学改性和光交联的聚乙烯醇的ESR研究

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摘要

The hydrophilicity of poly(vinyl alcohol) (PVA) was lowered by acetalization with propionic aldehyde. After UV irradiation of pendent styrylpyridinium groups, these prepolymers form networks of different hydrophobicity depending on the degree of acetalization. PVA. films containing different amounts of propionic acetals were doped with 4-hydroxy-2,2,6,6-tetramethylpiperidine-1-oxyl. Then, the ESR spectra of the spin probe entrapped in the polymeric network were monitored while allowing different solvents to diffuse into the polymer. The rate of spin probe mobilization depends on the hydrophilicity/hydrophobicity of both the polymer network and the solvent. However, the modified polymers, even the more hydrophobic ones, are hydrophilic in comparison to ''really'' hydrophobic polymers. This is probably caused by the character of the parent polymer (PVA), unreacted hydroxy groups. Simulations of the ESR spectra have shown that in polymers with a higher degree of acetalization domains of different hydrophobicity are built in which the spin probes have a different mobility. (C) 1995 John Wiley & Sons, Inc. [References: 17]
机译：通过用丙醛缩醛化，聚乙烯醇（PVA）的亲水性降低。在对悬垂的苯乙烯基吡啶鎓基团进行紫外线照射后，这些预聚物根据缩醛化程度形成不同疏水性的网络。 PVA。用4-羟基-2,2,6,6-四甲基哌啶-1-氧基掺杂含有不同量丙醛缩醛的薄膜。然后，监测截留在聚合物网络中的自旋探针的ESR光谱，同时允许不同的溶剂扩散到聚合物中。旋转探针动员的速率取决于聚合物网络和溶剂的亲水性/疏水性。然而，与“真正”疏水聚合物相比，改性聚合物，甚至是疏水性更高的聚合物，都是亲水的。这可能是由于未反应的羟基母体聚合物（PVA）的特性引起的。 ESR光谱的模拟表明，在具有不同疏水性的较高缩醛化结构域的聚合物中，自旋探针具有不同的迁移率。 （C）1995 John Wiley＆Sons，Inc. [参考：17]

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