【摘要】 将环氧改性聚酰胺(EPA)与热塑性玉米淀粉复合后采用浇铸法制备出新型增强生物降解复合膜,研究了EPA对复合膜结晶性能、交联程度、力学性能以及生物降解性能的影响。结果表明,玉米淀粉与EPA、烷基烯酮二聚体及丙三醇复合后,结晶程度明显下降。当EPA质量分数为21 62%时,复合膜的交联度高达45 77%,且复合膜残留物中非EPA成分的质量分数也达到24 15%;复合膜的干态拉伸强度和断裂伸长率分别可以高于12 0MPa和45 0%,湿态拉伸强度和断裂伸长率则分别可以达到5 40MPa和30 0%以上。EPA的添加降低了复合膜的生物降解性能。更多还原

【Abstract】 The novel enhanced biodegradable composite films of thermoplastic cornstarch and epoxide-modifying polyamide (EPA) are prepared by solution casting,and the influences of EPA on crystallization,cross-linking degree,mechanical properties and biodegradable property of the films are studied. Results show that the crystallization of composite films is decreased obviously.The cross-linking degree and the non-EPA content in the residue of the film, in which the EPA mass ratio is 21.62% ,reaches 45.77% and 24.15% ,respectively.The tensile strength and breaking elongation of the dry composite film are more than 12.0 MPa and 45.0% ,respectively,while the tensile strength and breaking elongation of the wet composite film are more than 5.40 MPa and 30.0% respectively. The epoxide-modifying polyamide can improve the mechanical properties, especially the wet tensile strength of the films evidently, and decrease the biodegradable property of the composite films.更多还原