PLA/稻壳粉复合材料界面改性方法及性能研究

以聚乳酸(PLA)和稻壳粉为原料,添加不同含量壳聚糖、硅烷偶联剂和氢氧化钠(NaOH)作为改性剂,通过压膜成型法制备了PLA/稻壳粉复合材料,并对复合材料的力学性能和吸水性进行了测试表征,同时对复合材料进行了X射线衍射仪(XRD)分析.结果表明,当壳聚糖含量为4 g时,复合材料的洛氏硬度较高,其冲击强度、弯曲强度、拉伸...

Study on Interface Modification Methods and Properties of PLA/Rice Husk Powder Composites

PLA/rice husk powder wood plastic composites were prepared by a compression molding method with chitosan， silane?coupling agent and sodium hydroxide as modifiers. Their mechanical properties and water absorption of the composites were characterized， and their crystalline structures were analyzed with XRD. The results indicated that the composites exhibited a higher Rockwell hardness at a chitosan mass of 4 g， and their impact strength， bending strength， tensile strength， and water absorption increased by 22 %， 77 %， 48 %， and 40 % respectively. When the content of silane coupling agent was 2 g， their impact strength， bending strength and tensile strength increased by 32 %， 78 % and 61 %， respectively， but their water absorption decreased by 7 %. When the rice husk powders were treated with 6 g sodium hydroxide， the composites did not show a significant enhancement in mechanical properties， and their water absorption increased by 15 %. In summary， silane coupling agent has a good comprehensive modification effect on the composites， chitosan can better improve the mechanical properties of the composites， and NaOH is an excellent hydrophilic modifier.