烷基烯酮二聚体改性木粉/聚丙烯复合材料的流变性能研究  

Effect of Alkyl Ketene Dimer Treatment on the Rheological Properties of Wood Fiber/Polypropylene Composite Materials

作　　者：徐俊杰 韦晨锋 朱莽 郝笑龙[1,2] 赵悦英 韩玉杰 化明志[3] 欧荣贤 XU Junjie;WEI Chenfeng;ZHU Mang;HAO Xiaolong;ZHAO Yueying;HAN Yujie;HUA Mingzhi;OU Rongxian(Institute of Biomass Engineering,Key Laboratory of Energy Plants Resource and Utilization(Ministry of Agriculture and Rural Affairs),South China Agricultural University,Guangzhou 510642,China;Key Laboratory for Biobased Materials and Energy of Ministry of Education,College of Materials and Energy,South China Agricultural University,Guangzhou 510642,China;Shandong Yiju New Material Technology Co.,Ltd.,Jining 277600,China;Wood Value Promotion and Sustainable Development Center,Beijing 100036,China)

机构地区：[1]华南农业大学生物质工程研究院农业农村部能源植物资源与利用重点实验室,广东广州510642 [2]生物基材料与能源教育部重点实验室(华南农业大学材料与能源学院),广东广州510642 [3]山东宜居新材料科技有限公司,山东济宁277600 [4]木材节约发展中心,北京100036

出　　处：《纤维素科学与技术》2023年第4期49-57,I0003,共10页Journal of Cellulose Science and Technology

基　　金：国家自然科学基金(32071698);广东省重点领域研发计划项目(2020B0202010008);广东省自然科学基金项目(2023A1515012640)。

摘　　要：为提升木塑复合材料(WPC)的流变性能,本研究探讨了经不同用量的烷基烯酮二聚体(AKD)改性后的木粉对WPC的加工流变性能和结构流变性能的影响。实验结果表明,随着AKD与木粉的质量比由0∶100增加至12∶100,WPC熔体的平衡转矩、剪切热和挤出压力分别最多下降21.05%、15.27%和30.93%;当扫描频率为0.05 rad/s时,WPC熔体的储能模量、损耗模量和复数黏度随AKD用量增加而分别最多下降27.76%、25.82%和26.87%;动态频率扫描的结果表明,AKD的改性作用减弱了WF与聚丙烯(PP)之间以及WF之间的相互作用力;Han图和Cole-Cole图的结果揭示了WPC具有多尺度长弛豫机制的类固体流变性质,而WF与PP之间不相容的流变学特征随AKD用量的增加逐渐减弱;断面微观形貌显示AKD用量增加导致WPC界面结合的减弱,并伴随着力学性能的下降。本研究为WPC的高效加工和流变性能研究提供了实践依据和技术借鉴。To improve the rheological properties of wood-plastic composites(WPC),this study systematically delved into the influence of wood fiber(WF),subjected to diverse contents of alkyl ketene dimer(AKD)modification,on the processing and structural rheological characteristics of WPC.The experimental findings underscored a notable trend:as the mass ratio ofAKD to WF increased from 0:100 to 12:100,the equilibrium torque,shear heat,and extrusion pressure of the WPC melt exhibited a discernible decrease,marking reductions of up to 21.05%,15.27%,and 30.93%,respectively.At a scanning frequency of 0.05 rad·s⁻¹,the storage modulus,loss modulus,and complex viscosity of the WPC melt registered significant decreases of up to 27.76%,25.82%,and 26.87%,respectively,in correlation with the ascending AKD content.Dynamic frequency scanning elucidated that AKD modification played a crucial role in weakening the interaction both between WF and polypropylene(PP)and within the WF particles themselves.Moreover,The Han plot and Cole-Cole plot indicated that the WPC melts displayed solid-like rheological behavior with a multi-scale long-time relaxation mechanism.The rheological characteristics associated with the incompatibility between WF and PP gradually diminished with increasing AKD content.Microscopic morphology of the cross-section further substantiated these observations,revealing that the heightened AKD content led to a weakening of the WPC interfacial adhesion,consequently resulting in a decline in mechanical properties.In conclusion,this study not only provided a practical foundation but also served as a valuable technical reference for the efficient processing and comprehensive understanding of the rheological properties of WPC.

关 键 词：木塑复合材料 流变性能 AKD改性 表面自由能 界面结合 

分 类 号：TB332[一般工业技术—材料科学与工程]