化工进展2025，Vol.44Issue(3)：1588-1598,11.DOI:10.16085/j.issn.1000-6613.2024-0457
不同聚合度对聚乙烯醇成膜过程、膜结构和膜性能的影响
Effects of different polymerization degrees on the formation,structure and property of polyvinyl alcohol films
摘要
Abstract
There is structural heterogeneity in polyvinyl alcohol(PVA)films prepared by solvent evaporation.In this study,PVA with molecular weights(Mw)of 27000,47000,75000 and 98000 were used for experiments.It was focused on the process of formation,structure and properties of PVA films,and the influence of polymerization degree(DP)on the rheological properties,structural homogeneity,hygroscopic and water-resistant properties of the PVA films,as well as its mechanical properties and optical properties were investigated.The results showed that with the increase of DP,the required concentration for liquid-solid transformation of PVA aqueous solution decreased and the structural heterogeneity of PVA films in the longitudinal section also decreased.Besides,the contact angle of PVA film increased with the increase of DP,which was attributed to the decrease of surface roughness.PVA-1(Mw≈27000),the lowest DP,had the highest sensitivity to moisture and the worst water resistance.Both the DP and the moisture content indicated the significant impact on the mechanical properties of PVA film.When the moisture content reached to 5%,the yield point just disappeared,resulting in the obvious stress whitening phenomenon during the tensile process.It was attributed to the water in the PVA film which was treated as a stress concentration point during loading,resulting in micropores formation.关键词
聚乙烯醇/流变性能/结构异质性/力学性能/耐水性能Key words
polyvinyl alcohol/rheological property/structural heterogeneity/mechanical property/water resistance分类
通用工业技术引用本文复制引用
杜静静,蒋军,徐信武,邵鲁鹏,徐朝阳,梅长彤..不同聚合度对聚乙烯醇成膜过程、膜结构和膜性能的影响[J].化工进展,2025,44(3):1588-1598,11.基金项目
国家自然科学基金(31901248) （31901248）
制浆造纸科学与技术教育部重点实验室开放基金(KF202211). （KF202211）
