聚对苯二甲酸-己二酸丁二醇酯/改性玄武岩纤维复合材料的制备及性能

Preparation and properties of Biodegradable PBAT/modified basalt fiber composites

摘要:

通过醇-水溶液法制备了γ-氨基丙基三乙氧基硅烷(KH550)改性的玄武岩纤维(MBF),后作为填料与聚对苯二甲酸-己二酸丁二醇酯(PBAT)熔融共混制备了一系列不同MBF含量的PBAT/MBF复合材料；对PBAT/MBF复合材料的微观形貌、热性能、热稳定性、力学性能和阻隔性能进行了研究。结果表明,低含量的MBF可以均匀分散在PBAT基体中起到异相成核作用,显著改善PBAT的结晶性能。当MBF含量达到5 %时,PBAT/MBF复合材料的断裂伸长率可以达到790 %,较纯PBAT提高了90%。MBF的添加还显著提升了PBAT的阻隔性能,PBAT/MBF-5%的氧气和水蒸气透过系数达到4.45×10-14 cm3·cm/(cm2·s·Pa)和2.78×10-13 g·cm/(cm2·s·Pa),相较于纯PBAT分别下降了18 %和20%。
关键词:玄武岩纤维；聚对苯二甲酸-己二酸丁二醇酯；复合材料；结晶性能；力学性能；阻隔性能
中图分类号:TB332???? 文献标识码:? A??? 文章编号:

Abstract:

γ-aminopropyl triethoxysilane (KH550)-modified basalt fibers (MBF) were prepared by the alcohol-water solution method, then a series of PBAT/MBF composites with different MBF contents were prepared by melt blending with poly(butylene adipate-co-terephthalate) (PBAT) as filler. The microscopic morphology, thermal properties, thermal stability, mechanical properties and barrier properties of the PBAT/MBF composites were investigated. The results show that the low content of MBF can be uniformly dispersed in the PBAT matrix to play the role of heterogeneous nucleation, which significantly improves the crystallization properties of PBAT. When the content of MBF reaches up to 5 %, the elongation at break of PBAT/MBF composites increases to 790 %, which is 90 % higher than that of pure PBAT. The addition of MBF also significantly improves the barrier properties of PBAT. Oxygen and water vapor permeability of PBAT/MBF-5% reaches up to 4.45×10-14cm3·cm/(cm2·s·Pa) and 2.78×10-13g·cm/(cm2·s·Pa), which decreased by 18 % and 20 %, respectively, compared with pure PBAT.