To improve the interfacial adhesion and mechanical performance of biocomposite, titanate coupling agent CS-201 and silane coupling agent KH550 as the mixed coupling agents, poly(3-hydroxybutyrate-co-4-hydroxybutyrate) (P34HB) biocomposite reinforced wood fibers modified with mixed coupling agents were prepared via hot pressing process. The mixed coupling agents showed a good synergistic effect on improving the interfacial compatibility of of biocomposite. From SEM, it could be seen that the interfacial compatibility between wood fibers and P34HB were effectively enhanced by the mixed coupling agents. By FTIR spectroscopy, new chemical bonds could be observed between P34HB and wood fibers as a result of adding the mixed coupling agents. The thermal stability of the biocomposite was increased by adding the mixed coupling agents. DMA indicated that the temperature was negatively correlated with the storage modulus E' of the biocomposite. Compared to untreated biocomposite, the biocomposite treated with the mixed coupling agents displayed excellent mechanical properties (a 56 % and 200 % improvement in tensile strength and elastic modulus respectively). In addition, the synergistic enhancement effect was most significant when the content of the mixed coupling agent was 1%.

为了提高生物复合材料的界面粘合力和机械性能，将钛酸酯偶联剂CS-201和硅烷偶联剂KH550作为混合偶联剂，将聚（3-羟基丁酸酯-co-4-羟基丁酸酯）（P34HB）生物复合增强木纤维进行混合改性偶联剂是通过热压工艺制备的。混合偶联剂在改善生物复合材料的界面相容性方面显示出良好的协同作用。从SEM可知，混合偶联剂有效地增强了木纤维与P34HB之间的界面相容性。通过FTIR光谱，由于添加了混合偶联剂，可以在P34HB和木纤维之间观察到新的化学键。通过添加混合的偶联剂，可以提高生物复合材料的热稳定性。DMA表明温度与生物复合材料的储能模量E'负相关。与未处理的生物复合材料相比，用混合偶联剂处理的生物复合材料具有出色的机械性能（拉伸强度和弹性模量分别提高了56％和200％）。另外，当混合偶联剂的含量为1％时，协同增强效果最显着。