Abstract

To prolong the service lives of wood fiber (WF)/poly(lactic acid) (PLA) composites, composites with different contents of bis (2,6-diisopropylphenyl) carbodiimide (BDICDI) were prepared. The composites were buried in natural soil for 150 days to evaluate the stabilizing effect of BDICDI on the WF/PLA composites. It was also used to evaluate the properties changes of WF/PLA composites under extreme conditions. The changes in the chemical structures, molecular weights and thermal properties of the WF/PLA composites during soil burial and the stabilization mechanism of BDICDI on the composites were studied. The results showed that the addition of BDICDI reacted with both the formed acid and the water absorbed by the WF/PLA composites, which inhibited the breaking of ester bonds in the WF/PLA composites. After 120 days of soil burial, the tensile strengths of the WF/PLA/1 wt% BDICDI composites were 1.31 times to those of the WF/PLA composites. This research provided theoretical support to prolong the service lives of WF/PLA composites and expanded the application scope of WF/PLA composites.

Graphic Abstract

摘要

为了延长木纤维（WF）/聚乳酸（PLA）复合材料的使用寿命，制备了不同含量的双（2，6-二异丙基苯基）碳二亚胺（BDICDI）复合材料。将复合材料埋入自然土壤中150天，以评估BDICDI对WF / PLA复合材料的稳定作用。它也用于评估WF / PLA复合材料在极端条件下的性能变化。研究了土葬过程中WF / PLA复合材料的化学结构，分子量和热性能的变化以及BDICDI在复合材料上的稳定机理。结果表明，BDICDI的加入与所形成的酸和WF / PLA复合材料吸收的水反应，从而抑制了WF / PLA复合材料中酯键的断裂。经过120天的土葬，WF / PLA / 1重量％BDICDI复合材料的拉伸强度是WF / PLA复合材料的拉伸强度的1.31倍。该研究为延长WF / PLA复合材料的使用寿命提供了理论依据，并扩大了WF / PLA复合材料的应用范围。

图形摘要