In order to improve the heat stability of poly(vinyl alcohol) (PVA) hydrogel, acetalized PVA was irradiated with electron beam irradiation. The acetalization was strongly affected by PVA water content. There is an optimum water content of 20-30% for acetalization of PVA. The PVA gave maximum tensile strength at a dose of 100 kGy before or after acetalization. The PVA hydrogel maintained tensile strength of 10 MPa, even after 90 min boiling (98 degrees C) in water or autoclave sterilization (121 degrees C). It was confirmed that irradiation after, or before, acetalization is effective for enhancing heat resistance of a PVA hydrogel. The hydrogel is transparent, soft, has high tensile strength, and high hot water resistance. (C) 1995 John Wiley and Sons, Inc. [References: 14]
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机译：为了提高聚乙烯醇（PVA）水凝胶的热稳定性，对乙缩醛化的PVA进行电子束照射。缩醛化受到PVA水分的强烈影响。聚乙烯醇缩醛化的最佳含水量为20-30％。在缩醛化之前或之后，PVA以100 kGy的剂量提供最大的拉伸强度。即使在水中沸腾90分钟（98摄氏度）或高压灭菌（121摄氏度）后，PVA水凝胶仍保持10 MPa的拉伸强度。已经证实，在缩醛化之后或之前进行辐照对于增强PVA水凝胶的耐热性是有效的。水凝胶是透明的，柔软的，具有高的拉伸强度和高的耐热水性。 （C）1995 John Wiley and Sons，Inc. [参考：14]
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