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bce ›› 2018, Vol. 52 ›› Issue (2): 18-22.doi: 10.3969/j.issn.1673-5854.2018.02.004

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Preparation and Characterization of Pea Starch/Polylactic Acid Double Layer Film

ZHOU Xiaoming, SHENG Jie, LIU Xu, YANG Rendang   

  1. South China University of Technology, State Key Laboratory of Pulp and Paper Engineering, Guangzhou 510640, China
  • Received:2017-09-21 Online:2018-03-30 Published:2018-04-03

Abstract: The pea starch/polylactic acid(PS/PLA) double layer film was prepared by solution casting method with pea starch(PS) and polylactic acid(PLA) as raw materials. The mechanical properties, hydrophobicity and water vapor barrier properties of the films were studied by testing the water absorption, solubility, water vapor transmission performance, tensile properties and surface morphology of double layer films. The results showed that with the increase of the proportion of polylactic acid layer, the water absorption, solubility and water vapor permeability of double layer film decreased, the tensile strength and tensile modulus increased, the elongation decreased gradually, which indicated that the water vapor barrier effect was obvious, the toughness increased and the strength reduced. When the mass ratio of PLA and PS was 50:50, the tensile strength, tensile modulus, elongation at break of PS/PLA double layer were (13.47±0.75)MPa, (0.848±0.002)GPa, and (16.11±0.16)%, respectively; and the water vapor transmission coefficient was 0.27×10-10 g·cm/(cm2·s·Pa).

Key words: casting method, double layer film, polylactic acid, pea starch

CLC Number: