title: Properties of polyvinyl alcohol/xylan composite films with citric acid.
abstract: 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.
authors: State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, China.
authors: Shuaiyang
authors: S
authors: Wang
authors: State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, China. Electronic address: renjunli@scut.edu.cn.
authors: Junli
authors: J
authors: Ren
authors: State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, China.
authors: Weiying
authors: W
authors: Li
authors: State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, China; Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing, China.
authors: Runcang
authors: R
authors: Sun
authors: State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, China; Department of Paper and Bioprocess Engineering, State University of New York-College of Environmental Science and Forestry, 1 Forestry Drive, Syracuse, NY 13210, USA. Electronic address: sliu@esf.edu.
authors: Shijie
authors: S
authors: Liu
mesh_terms: D019343:Citric Acid / Q000737:chemistry*; D003432:Cross-Linking Reagents / Q000138:chemical synthesis / Q000737:chemistry*; D010968:Plasticizers / Q000138:chemical synthesis / Q000737:chemistry*; D011142:Polyvinyl Alcohol / Q000737:chemistry*; D014990:Xylans / Q000737:chemistry*
chemical_list: D003432:Cross-Linking Reagents; D010968:Plasticizers; D014990:Xylans; D019343:Citric Acid; D011142:Polyvinyl Alcohol
keywords: Citric acid; Composite films; Cross-linking agent; Plasticizer; Polyvinyl alcohol; Xylan