摘要
以杨木纤维和聚乳酸为原料,通过硅烷偶联剂KH-550对杨木纤维提前进行表面改性,随后通过熔融共混工艺将改性后的杨木纤维与聚乳酸进行混合,制备出了木纤维-聚乳酸复合材料。研究了KH-550处理时间对杨木纤维的物相结构、微观形貌、光谱性能和水接触角的影响,并分析了KH-550处理时间对木纤维-聚乳酸复合材料微观形貌、力学性能和耐水性能的影响。结果表明,随着KH-550处理时间的增加,木纤维的结晶度得到了提高,表面出现了大量凸起,水接触角逐渐增大,润湿性降低。当KH-550处理时间为9 h时,硅烷偶联剂与木纤维表面的反应逐渐达到了饱和状态,木纤维表面的粗糙度趋于稳定。随着KH-550处理时间的增加,木纤维-聚乳酸复合材料的冲击强度、静曲强度和弹性模量均先增大后降低,吸水率和吸水厚度膨胀率均先快速增大后逐渐趋于平缓。当KH-550处理时间为9 h时,复合材料的冲击强度、静曲强度和弹性模量达到最大值,分别为8.5,31.5 MPa和40.3 GPa;该试样的吸水率和吸水厚度膨胀率在75 h时达到饱和状态,分别为最低值12.7%和6.9%,耐水性能最强。
Using poplar fiber and polylactic acid as raw materials,surface modification of poplar fiber was carried out in advance through silane coupling agent KH-550,and then the modified poplar fiber was mixed with polylactic acid through melt blending process to prepare wood fiber-polylactic acid composite material.The effect of KH-550 treatment time on the phase structure,microstructure,spectral properties,and water contact angle of poplar fibers was studied,and the influence of KH-550 treatment time on the microstructure,mechanical properties,and water resistance of wood fiber-polylactic acid composite materials was analyzed.The results showed that with the increase of KH-550 treatment time,the crystallinity of wood fibers was improved,a large number of protrusions appeared on the surface,the water contact angle gradually increased,and the wettability decreased.When the KH-550 treatment time was 9 h,the reaction between the silane coupling agent and the surface of the wood fiber gradually reached saturation,and the roughness of the wood fiber surface tended to stabilize.With the increased of KH-550 treatment time,the impact strength,static flexural strength,and elastic modulus of the wood fiber-polylactic acid composite material first increased and then decreased,while the water absorption rate and water absorption thickness expansion rate first rapidly increased and then gradually stabilized.When the processing time of KH-550 was 9 h,the impact strength,static flexural strength,and elastic modulus of the composite material reached their maximum values of 8.5,31.5 MPa and 40.3 GPa,respectively.The water absorption rate and water absorption thickness expansion rate of the sample reached saturation at 75 h,with the lowest values of 12.7%and 6.9%,respectively,indicating the strongest water resistance.
作者
朱黎明
范丽敏
兰珊
杨芳
邹献武
ZHU Liming;FAN Limin;LAN Shan;YANG Fang;ZOU Xianwu(Research Institute of Wood Industry,Chinese Academy of Forestry,Beijing 100091,China;College of Environment and Safety Engineering,Qingdao University of Science and Technology,Qingdao 266000,China)
出处
《功能材料》
北大核心
2025年第5期5173-5179,共7页
Journal of Functional Materials
基金
国家重点研发计划项目(2022YFD2200704)。
关键词
杨木纤维
聚乳酸
复合材料
力学性能
耐水性能
poplar fiber
polylactic acid
composite material
mechanical properties
water resistance performance
