Preparation and Properties of Biodegradable Multilayer Films Based on Soy Protein Isolate and Poly(lactide)

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• 作者：Jong-Whan Rhim ; Kmar A. Mohanty ; Sher P. Singh ; and Perry K. W. Ng
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2006
• 出版时间：April 26, 2006
• 年：2006
• 卷：45
• 期：9
• 页码：3059 - 3066
• 全文大小：125K
• 年卷期：v.45,no.9(April 26, 2006)
• ISSN：1520-5045

文摘

Multilayer film composed of a soy protein isolate (SPI) inner layer and poly(lactide) (PLA) outer layers wereprepared by a simple solvent casting method in order to exploit the advantageous properties of both filmmaterials. Tensile strength and elongation at break of the multilayer film were 17.0 ± 0.3 MPa and 176.9 ±27.9%, respectively. Especially the tensile strength of the multilayer film increased more than 5-fold comparedwith that of the SPI film. The mechanical properties of the multilayer film were comparable to those oflow-density polyethylene (LDPE) or high-density polyethylene (HDPE) films. The lamination of PLA layerson SPI film also resulted in desirable gas barrier properties of the film with both low water vapor permeability(WVP) of PLA and low oxygen permeability (OP) of SPI. The WVP of the multilayer film [(6.66 ± 0.27)× 10^-14 kg·m/m²·s·Pa] decreased 40-fold compared with that of the SPI film, and the OP of the multilayerfilm [(2.40 ± 0.24) × 10^-18 m³·m/m²·s·Pa] decreased more than 26-fold compared with that of the PLAfilm. In addition, the multilayer film had adequate water resistance over short periods. All of these propertyimprovements may be attributed to the strong adhesion between both polymers used, i.e., SPI and PLA.