用高速混合-平板热压法制备了70%木纤维含量的木纤维-聚乳酸(WF-PLA)复合材料,研究了不同聚乳酸(PLA)对WF-PLA复合材料的耐水性、弯曲强度和弯曲模量、PLA分子量及热性能的影响.结果表明,PLA与木纤维复合后,弯曲模量明显增加,复合材料中PLA分子量和熔融温度明显下降;PLA性能对WF-PLA复合材料性能影响显著,WF-PLA复合材料中PLA分子量随PLA原料分子量下降而下降,高分子量PLA制备的WF-PLA复合材料耐水性更好,弯曲强度和弯曲模量更高;在PLA改性时,应避免引起PLA分子量下降.
The poly(lactic acid)-wood fiber (WF-PLA) composites with 70 % WF were prepared by high super mixing-flat hot press. Water resistance, flexural strength and modulus, molecular weight and thermal properties of different WF-PLA composites were tested and compared. The results indicate that when PLA combined with WF, flexural modulus improves, but molecular weight and T_m of PLA decrease. PLA has a significant effect on the properties of WF-PLA composites. The molecular weight of PLA in WF-PLA composites decreases with molecular weight of PLA raw materials decreases. The water resistance, flexural strength and modulus of WF-PLA composites are better when prepared with higher molecular weight PLA. PLA molecular weight decreasing should be avoided when PLA is modified in WF-PLA composites.
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