蛭石/PBAT复合薄膜的制备与性能

使用蛭石（VMT）作为填料，以可生物降解的聚对苯二甲酸-己二酸丁二醇酯（PBAT）作为基体，采用熔融-吹塑法制备出蛭石/聚对苯二甲酸-己二酸丁二醇酯（VMT/PBAT）复合薄膜，并通过添加聚苯乙烯马来酸酐共聚物（SMA）作为相容剂制备了VMT/PBAT/SMA复合薄膜。对纯PBAT薄膜、VMT/PBAT和VMT/PBAT/SMA复合薄膜的热性能、流变性能、水蒸汽阻隔性能、断面微观结构和力学性能进行了测试。结果表明，相比纯PBAT薄膜，蛭石的填充使VMT/PBAT复合薄膜的热稳定性降低，相容剂SMA的添加增强了VMT/PBAT/SMA复合薄膜的热稳定性；蛭石的添加使复合薄膜的结晶度降低了约2%。水蒸汽透过量测试表明，两种复合薄膜水蒸汽阻隔性能符合国家标准；VMT的添加使VMT/PBAT复合薄膜的拉伸强度和断裂伸长率降低，而添加相容剂SMA使VMT/PBAT/SMA复合薄膜的拉伸强度和断裂伸长率相比VMT/PBAT复合薄膜提高约10 %。

Preparation and properties of vermiculite /PBAT composite films

Using vermiculite (VMT) as filler and biodegradable polyterephthalate-butanediol ester (PBAT) as matrix, vermiculite/polyterephthalate-butanediol ester (VMT/PBAT) composite films were prepared by melt-blow molding method. VMT/PBAT/SMA composite films were prepared by adding polystyrene maleic anhydride copolymer (SMA) as compatibilizer. The thermal properties, rheological properties, water vapor barrier properties, micro-structure and mechanical properties of pure PBAT films, VMT/PBAT and VMT/PBAT/SMA composite films were tested. The results show that, compared with pure PBAT films, vermiculite filling reduces the thermal stability of VMT/PBAT composite films, and the addition of SMA compatibilizing agent enhances the thermal stability of VMT/PBAT/SMA composite films. The addition of vermiculite reduces the crystallinity of the composite film by about 2%. The water vapor permeability test shows that the water vapor barrier performance of the two composite films conforms to the national standard. The addition of VMT reduced the tensile strength and elongation at break of VMT/PBAT composite film, while the addition of compatibilizer SMA increased the tensile strength and elongation at break of VMT/PBAT composite film by about 10% compared with that of VMT/PBAT composite film.