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

摘要：

以木质素磺酸钠（LS）和聚乙烯醇(PVA)为主要原料，添加适量硼砂、明胶在水溶液中溶解共混，流延成膜。通过单因素和正交实验优选了LS/PVA共混膜制备的条件，对共混膜进行了耐水性、形貌、红外、热重、X射线衍射及差示扫描量热分析。结果表明：影响共混膜性能的主要因素有LS含量、硼砂含量以及反应时间，当硼砂含量为2.0%时，共混膜的拉伸强度最大达到43.98 MPa，比纯PVA膜的拉伸强度提高了189%； 形貌分析表明LS含量影响共混膜两相分散性，适量的明胶能改善LS与PVA 的相容性。热重分析表明共混膜具有比LS和PVA 更高的热稳定性；红外光谱、DSC分析及X射线衍射分析表明LS的加入减小了PVA膜的结晶性.

关键词: 共混膜, 聚乙烯醇, 木质素磺酸钠, 性能表征