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Properties of polyvinyl alcohol/xylan composite films with citric acid

Wang, Shuaiyang, Ren, Junli, Li, Weiying, Sun, Runcang, Liu, Shijie
Carbohydrate polymers 2014 v.103 pp. 94-99
Fourier transform infrared spectroscopy, citric acid, composite materials, cross-linking reagents, films (materials), hydrogen bonding, permeability, plasticizers, polyvinyl alcohol, scanning electron microscopy, solubility, tensile strength, thermal stability, water vapor, xylan
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 11.6MPa. However, the elongation at break increased sharply from 15.1% to 249.5%. The values of water vapor permeability ranged from 2.35 to 2.95×10−7g/(mm2h). 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.