Polylactic acid (PLA), one of the most likely green and environmentally friendly materials, is an alternative to petroleum-based plastic. It still remains a challenge to increase the degradation rate and decrease the cost of PLA without compromised mechanical properties. Low cost PLA/wood flour (WF) composite was elaborately designed and fabricated with improved interface compatibility through the introducing of polymethyl methacrylate (PMMA). The result indicated that compared with that of neat PLA, the tensile strength and bending strength of PLA/WF/PMMA (8:2) (80 wt% of the PLA, 20 wt% of WF and PMMA (8:2)) were increase by 4.60% and 26.54% respectively. Through the hydrolysis experiments combined with the SEM analysis, the main reason for the improvement of the mechanical properties of composite materials was that PMMA makes continuous three-phase composition, and interface compatibility of PLA and WF with overly different polarity was modified. Meanwhile, the hydrolysis rate of PLA/WF/PMMA was much faster than that of PLA. Finally, there was a more significant discovery that the addition of PMMA changed material degradation mechanism, and it was why to efficiently accelerate the degradation rate of the material. This will provide a new inspiration for PLA degradation research, and a fresh perspective is to be given other materials.

聚乳酸（PLA）是最有可能的绿色和环保材料之一，是石油基塑料的替代品。在不损害机械性能的情况下，提高降解速率和降低PLA成本仍然是一个挑战。通过引入聚甲基丙烯酸甲酯（PMMA）精心设计和制造了低成本的PLA /木粉（WF）复合材料，具有改善的界面相容性。结果表明，与纯PLA相比，PLA / WF / PMMA（8：2）的拉伸强度和弯曲强度（PLA的80 wt％，WF和PMMA的20 wt％（8：2））为分别增长4.60％和26.54％。通过水解实验和SEM分析，改善复合材料力学性能的主要原因是，PMMA可以形成连续的三相成分，并修饰了极性相差太大的PLA和WF的界面相容性。同时，PLA / WF / PMMA的水解速率比PLA快得多。最后，有一个更重要的发现是，添加PMMA改变了材料的降解机理，这就是为什么要有效地加快材料的降解速率的原因。这将为PLA降解研究提供新的灵感，并为其他材料提供新的视角。有一个更重要的发现是，添加PMMA改变了材料的降解机理，这就是为什么要有效地加快材料的降解速率的原因。这将为PLA降解研究提供新的灵感，并为其他材料提供新的视角。有一个更重要的发现是，添加PMMA改变了材料的降解机理，这就是为什么要有效地加快材料的降解速率的原因。这将为PLA降解研究提供新的灵感，并为其他材料提供新的视角。