通过热塑加工方法制备了聚乙烯醇/聚乙烯吡咯烷酮(PVA/PVP)共混材料,采用差示扫描量热分析、热重分析、傅里叶红外光谱、高压毛细管流变仪等研究了PVA与PVP间的氢键作用、共混材料的热行为和流变性能.结果表明,PVP可与PVA及改性剂形成氢键复合,增加体系氢键类型,能进一步屏蔽PVA羟基,延缓其脱除反应,提高其初始热分解温度,有利于PVA的热塑加工.随PVP含量增加,共混体系熔融温度先略升高,后降低,获得86.4℃热塑加工窗口;熔体表观黏度和剪切敏感性均先增大后减小,PVP质量分数为20％时达最大;而粘流活化能降低,表明共混体系对温度的敏感性降低,PVA加工稳定性提高.适量PVP可促进PVA的结晶,提高材料拉伸强度;PVP质量分数为10％时,材料拉伸强度最大,为43MPa.
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