聚乙烯醇/木聚糖复合膜的柠檬酸性质。
Properties of polyvinyl alcohol/xylan composite films with citric acid.
机构信息
State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, China.
State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, China.
出版信息
Carbohydr Polym. 2014 Mar 15;103:94-9. doi: 10.1016/j.carbpol.2013.12.030. Epub 2013 Dec 17.
Composite films of xylan and polyvinyl alcohol were produced with citric acid as a new plasticizer or a cross-linking agent. The effects of citric acid content and polyvinyl alcohol/xylan weight ratio on the mechanical properties, thermal stability, solubility, degree of swelling and water vapor permeability of the composite films were investigated. The intermolecular interactions and morphology of composite films were characterized by FTIR spectroscopy and SEM. The results indicated that polyvinyl alcohol/xylan composite films had good compatibility. With an increase in citric acid content from 10% to 50%, the tensile strength reduced from 35.1 to 11.6 MPa. However, the elongation at break increased sharply from 15.1% to 249.5%. The values of water vapor permeability ranged from 2.35 to 2.95 × 10(-7)g/(mm(2)h). Interactions between xylan and polyvinyl alcohol in the presence of citric acid become stronger, which were caused by hydrogen bond and ester bond formation among the components during film forming.
采用柠檬酸作为新型增塑剂或交联剂制备了木聚糖/聚乙烯醇复合膜。考察了柠檬酸含量和聚乙烯醇/木聚糖质量比对复合膜力学性能、热稳定性、溶解度、溶胀度和水蒸气透过性能的影响。通过傅立叶变换红外光谱（FTIR）和扫描电子显微镜（SEM）对复合膜的分子间相互作用和形态进行了表征。结果表明，聚乙烯醇/木聚糖复合膜具有良好的相容性。随着柠檬酸含量从 10%增加到 50%，拉伸强度从 35.1MPa 降低到 11.6MPa，而断裂伸长率从 15.1%急剧增加到 249.5%。水蒸气透过率值在 2.35×10(-7)~2.95×10(-7)g/（mm(2)h）之间。在柠檬酸存在下，木聚糖与聚乙烯醇之间的相互作用增强，这是由于在成膜过程中各组分之间形成了氢键和酯键。
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