改性蒙脱土/PVA/淀粉复合膜的制备及其抗菌性能

Preparation and Antibacterial Property of Modified Montmorillonite/PVA/Starch Composite Film

采用高温灼烧法制备纳米氧化铜蒙脱土(MMT-CuO),然后用十四烷基二甲基苄基氯化铵(1427)进行蒙脱土的阳离子改性。以聚乙烯醇(PVA)、红薯淀粉为基材,甘油为塑化剂,蒙脱土为抑菌剂和强化剂,制备改性蒙脱土/PVA/淀粉复合膜。结果表明,随着未改性蒙脱土的含量增加,复合膜的抗拉强度也逐渐增加,添加量为8%时,膜的抗拉强度为(7.132±0.201)MPa,断裂伸长率为(145.747±5.039)%;季铵盐改性MMT-CuO的添加量的增大,膜的拉伸强度变化不显著,但是断裂伸长率、水溶性和水蒸气透过性均降低,改善了膜的水溶性和水蒸气透过性;改性蒙脱土可以提高膜的抗菌性,尤其对金黄色葡萄球菌,这种复合改性蒙脱土在抗菌包装上具有潜在应用价值。

Montmorillonite-copper oxide(MMT-Cu O)nanocomposites were obtained by high-temperature calcinations,and then MMT-Cu O was modified by tetradecyldimethylbenzylammonium chloride(1427).The modified montmorillonite/PVA/starch composite film was prepared by casting method using polyvinyl alcohol(PVA)and sweet potato starch as substrate,glycerol as plasticize and modified montmorillonite as reinforcing and antibacterial agent.The results showed that the tensile strength increased with more addition of non-modified montmorillonite.When the addition content was 8%,the tensile strength of the film was(7.132±0.201)MPa,and the elongation at break was(145.747±5.039)%.But there was no significant difference on the tensile strength after the addition of the 1427 modified MMT-Cu O,the elongation at break of the composite film,the water solubility and water vapor permeability of the composite film were reduced.The film added with modified montmorillonite shown a good antibacterial property,significant in S.aureus.It could be concluded that the composite modified MMT had a potential application in antibacterial package.