疏水增强型淀粉/PVA生物降解膜的性能

以烷基烯酮二聚体为疏水化组分，环氧改性聚酰胺为增强交联组分制备了疏水增强型淀粉/聚乙烯醇膜。动态接触角和吸水率测试表明，烷基烯酮二聚体能大幅度提高膜的疏水性能，较佳的烷基烯酮二聚体含量为3.30%，疏水增强型淀粉/聚乙烯醇膜接触角可达90°，吸水率低至15.44%。环氧改性聚酰胺能明显改善膜的拉伸强度，但环氧改性聚酰胺含量过高对断裂伸长率不利。X-射线衍射表明烷基烯酮二聚体的内增塑作用和环氧改性聚酰胺的交联特性可增加膜的相容性。生物降解测试显示，疏水增强型淀粉/聚乙烯醇膜具有一定的生物降解性，但环氧改性聚酰胺使膜的生物降解性能下降。

Properties of hydrophobic enhanced biodegradable starch / PVA films

The hydrophobic enhanced biodegradable films of corn-starch, polyvinyl alcohol, epoxide-modifying polyamide(EPA), and alkyl ketene dimer (AKD) were prepared by solution casting. The dynamic contact angle and water absorption analysis show that the hydrophobility of the SP film is increased by the addition of AKD. When the content of AKD is 3.30%, the contact angle and water absorption rate of the film reaches 90° and 15.44%, respectively. EPA can improve the tensile strength obviously, while it is disadvantageous to the breaking elongation of the SP film when the content of EPA is exorbitant. X-ray diffraction indicates the compatibility between the film components is increased by the internal plasticizing effect of AKD and the crosslinking of EPA. Testing biodegradation activity shows that both St.aureus and E.coli have some biodegrading abilities on the SP films. However, the biodegradation ability of the SP films reduces with increasing of EPA content.