配比与紫外老化对PLA/PBAT包装膜性能及其中增塑剂乙酰柠檬酸三丁酯迁移的影响

制备聚乳酸/聚己二酸-对苯二甲酸丁二酯(PLA/PBAT)复合食品包装薄膜,探究了配比和紫外老化时间对其性能及其中增塑剂乙酰柠檬酸三丁酯(ATBC)迁移的影响。制备了10:90、20:80、30:70三种不同配比的PLA/PBAT复合薄膜,经过72、150、300 h紫外老化时间后,对薄膜的拉伸强度、阻隔性、可见光透过率、结晶度等性能进行测试。借助GC-MS建立增塑剂ATBC的检测方法,探究不同配比及紫外老化时间对薄膜中ATBC迁移的影响。结果显示3种配比对力学性能、透光率无明显影响,30:70配比薄膜的阻隔性及结晶度最优,ATBC迁移率最低,氧气透过率和水蒸气透过率分别为894 mL/(m²·d·0.1 MPa)和520 g/(m²·day),结晶度为5.99%,ATBC的迁移率为25%;紫外老化以后会破坏薄膜内部结构,同时使表面生成致密层,降低力学性能的同时阻碍了其中ATBC的迁移。

Effect of Proportion and Ultraviolet Aging on Performance and the ATBC Migration of PLA/PBAT Composites Film

PLA/PBAT composite films were prepared to explore their properties,and the influence of proportioning and ultraviolet aging time on migration of plasticizer Acetyl Tributyl Citrate(ATBC)from the composite films was studied.10∶ 90,2080,30∶70 three different proportions of PLA/PBAT composite film were prepared to test the strength,barrier property, crystalline,visible light transmittance performance of the film after ultra violet aging for 72,150,300 h.Using GC-MS based detection methods of ATBC,the influence of different proportion and ultraviolet aging time on ATBC migration was explored. Results showed that the tensile strength and light transmittance had no influence by proportion.The 30∶ 70(PLA/PBAT)film had the best barrier property and crystalline,and the lowest migration rate of ATBC.Oxygen transmission rate and water vapor transmission rate were 894cc/(m^2·d·0.1 MPa) and 520 g/(m^2·day),respectively.The crystallinity was 5.99%,and the migration rate of ATBC was 25%.After UV aging,the internal structure of the film would be destroyed,and at the same time,a dense layer would be formed on the surface,which would reduce the mechanical properties and hinder the transfer of ATBC.