title: The plasticizing mechanism and effect of calcium chloride on starch/poly(vinyl alcohol) films.
abstract: Starch/poly(vinyl alcohol) (PVA) films were prepared with calcium chloride (CaCl(2)) as the plasticizer. The micro morphology of pure starch/PVA film and CaCl(2) plasticized starch/PVA film was observed by scanning electron microscope. The interaction between CaCl(2) and starch/PVA molecules was investigated by Fourier transform infrared spectroscopy. The influence of CaCl(2) on the crystalline, thermal and mechanical properties of starch/PVA films was studied by X-ray diffraction, differential scanning calorimetry, thermogravimetric analysis, and tensile testing, respectively. The results indicated that CaCl(2) could interact with starch and PVA molecules and then effectively destroy the crystals of starch and PVA. Starch/PVA films plasticized with CaCl(2) became soft and ductile, with lower tensile strength and higher elongation at break compared with pure starch/PVA film. The water content of starch/PVA film would increase with the addition of CaCl(2). This is an important cause of the plasticization of CaCl(2) on starch/PVA film.
authors.affiliation: State Key Laboratory of Polymer Materials Engineering, Chengdu 610065, China.
authors.forename: Xiancai
authors.initials: X
authors.lastname: Jiang
authors.forename: Ting
authors.initials: T
authors.lastname: Jiang
authors.forename: Lingling
authors.initials: L
authors.lastname: Gan
authors.forename: Xiaofei
authors.initials: X
authors.lastname: Zhang
authors.forename: Hua
authors.initials: H
authors.lastname: Dai
authors.forename: Xi
authors.initials: X
authors.lastname: Zhang
mesh_terms: D002122:Calcium Chloride / Q000494:pharmacology*; D002152:Calorimetry, Differential Scanning; D008855:Microscopy, Electron, Scanning; D010968:Plasticizers / Q000737:chemistry* / Q000378:metabolism; D011142:Polyvinyl Alcohol / Q000737:chemistry* / Q000378:metabolism; D017550:Spectroscopy, Fourier Transform Infrared; D013213:Starch / Q000737:chemistry* / Q000378:metabolism; D013718:Tensile Strength / Q000187:drug effects*; D013818:Thermogravimetry; D014961:X-Ray Diffraction
chemical_list: D010968:Plasticizers; D011142:Polyvinyl Alcohol; D013213:Starch; D002122:Calcium Chloride