PBAT/PPC可生物降解薄膜的性能及其自然老化行为

Properties and Natural Weathering Behavior of PBAT/PPC Biodegradable Films

为提升聚己二酸‒对苯二甲酸丁二酯(PBAT)共混物的水蒸气阻隔性和耐候性能,通过熔融共混和吹塑方法制备了不同配比的PBAT/聚碳酸亚丙酯(PPC)共混物薄膜,研究了材料组成对共混物薄膜水蒸气阻隔性、力学性能、热性能、微观形貌、透光率等影响,并对其进行了自然老化表征。结果表明,PPC的加入提高了PBAT基薄膜的水蒸气阻隔性,但力学性能和热稳定性有所下降,加入质量分数为20%的PPC可使薄膜的水蒸气透过系数下降54.5%;自然老化试验表明,PPC能够提升PBAT基薄膜的耐候性。

In order to improve the water vapor barrier and weather resistance of poly(butylene adipate-co-terephthalate)(PBAT),PBAT/poly(propylene carbonate)(PPC)films were prepared by extrusion blending and blowing film.The effects of composition ratios on water vapor barrier properties,mechanical properties,thermal properties,microstructure,and light transmittance of the films were investigated,and all blend films were subjected to natural weathering test.The results show that the addition of PPC improves the water vapor barrier of PBAT-based films,and reduces the mechanical properties and thermal stability of films.Adding 20%PPC could reduce the water vapor permeability of the films by 54.5%.The natural weathering test indicates that PPC can improve the weather resistance of PBAT-based films.