关键词: 共混膜, 聚乙烯醇, 木质素磺酸钠, 性能表征

Abstract:

With reproducible sodium lignosulfonate（LS）and poly〖DK〗(vinyl alcohol〖DK〗)(PVA)as primary materials, as well as borax and gelatin, a series of blend films were prepared by the film casting method.The process conditions for preparing the blend films with good waterresistance and mechanical properties were determined by singlefactor and orthogonal experiments.Water resistance, SEM, FTIR, TGA, DSC and XRD analysis of blend films were performed to examine the contribution of LS, gelatin and borax to the properties of the blend films.The results indicated that the properties mainly were affected by the mass ratio of LS to borax and reaction time.By adding 2.0% borax, tensile strength was highly improved compared with pure PVA film(43.98 MPa vs 15.2 MPa).SEM studies showed that LS content affected the dispersion of LS/PVA films, while a proper amount of gelatin improved the compatibility between LS and PVA matrix.FTIR analysis revealed the formation of a strong intermolecular hydrogen bonding between LS carbonyl and PVA hydroxyl.According to TGA analysis, the LS/PVA blend films were more thermally stable than single component films.Compared to pure PVA films, the apparent decrease in crystallinity caused by the incorporation between LS and PVA was observed by FTIR, DSC and XRD.

Key words: 共混膜, 聚乙烯醇, 木质素磺酸钠, 性能表征