马来酸酐和二乙烯基苯共接枝对聚丙烯木塑等温结晶动力学的影响  

Isothermal crystallization kinetics of maleic anhydride and divinyl benzene co-grafted PP-based wood-plastic composites

作　　者：易顺民 刘婉玉 王清文 李长鑫 许世华 YI Shunmin;LIU Wanyu;WANG Qingwen;LI Changxin;XU Shihua(Guangxi Key Laboratory of Advanced Structural Materials and Carbon Neutralization,School of Materials and Environment,Guangxi Minzu University,Nanning 530105,China;Guangxi Academy of Science,Nanning 530007,China;College of Materials and Energy,South China Agricultural University,Guangzhou 510642,China;College of Art and Design,Wuyi University,Jiangmen 529020,China)

机构地区：[1]广西民族大学材料与环境学院广西先进结构材料与碳中和重点实验室,南宁530105 [2]广西科学院,南宁530007 [3]华南农业大学材料与能源学院,广州510642 [4]五邑大学艺术设计学院,江门529020

出　　处：《林业工程学报》2023年第2期109-116,共8页Journal of Forestry Engineering

基　　金：广西自然科学基金(2021GXNSFBA196056);广西民族大学引进人才科研启动项目(2020KJQD11);五邑大学博士科研启动项目(BSQD1902)。

摘　　要：通过马来酸酐(MAH)和二乙烯基苯(DVB)原位熔融共接枝改性聚丙烯(PP)基体,并直接与木粉熔融共混制备木塑复合材料。利用偏光显微镜(POM)和差示扫描量热仪(DSC),分别研究原位接枝改性对PP基体和木塑复合材料结晶形态及等温结晶行为的影响。结果表明:PP基体分子链上接枝的MAH基团提高了晶核的形成速率,PP晶核尺寸减小;添加DVB与MAH共接枝改性PP后,PP基体的结晶速率进一步提高,晶核尺寸进一步减小。加入木粉后,木粉的异相成核作用提高了PP基体的结晶速率,结晶速率常数K和半结晶时间t0.5增大;MAH原位接枝改性后,木粉与PP基体之间的界面相容性提高,但MAH接枝PP/木粉复合材料中PP基体结晶速率较未共混MAH接枝PP基体降低;加入DVB与MAH共接枝改性后,复合材料中PP基体的结晶速率较未共混的共接枝PP基体进一步提高。通过Arrhenius方程和Hoffman-Weeks外推法计算结果表明,在共接枝改性体系,少量支链结构的引入降低了复合材料中PP基体结晶所需的活化能,PP基体的快速结晶有利于复合材料的快速成型,但复合材料中PP晶体的热稳定性变差。As an ecologically and environmentally friendly material with outstanding comprehensive performance and significant ecological and economic benefits, wood-plastic composites can be developed to realize the efficient utilization of waste plastics and agricultural and forestry residues. Polypropylene(PP) matrix modified by in situ melting co-grafting of maleic anhydride(MAH) and divinyl benzene(DVB) was compounded with wood-particle to prepare wood-plastic composites. The grafted MAH greatly improved the interfacial interaction between PP and wood particle. The effects of the matrix modification on the crystal morphology and isothermal crystallization behavior of the PP matrix and the wood-plastic composites were investigated by the polarizing microscope(POM) and differential scanning calorimeter(DSC). The results showed that the grafted MAH group promoted the rate of crystal nucleus formation, while the size of crystal nucleus decreased compared to the unmodified PP. After adding DVB and MAH to modify PP, the crystallization rate of the MAH/DVB co-grafted PP matrix was further increased and the size of crystal nucleus was further reduced, compared to the MAH grafted PP. In the unmodified composites systems, the heterogeneous nucleation of wood particles accelerated the crystallization rate of the PP matrix, the crystallization rate constants K and the half-crystallization time t0.5increased. In the MAH grafting modification system, after grafting MAH onto PP, the effective interfacial bonding between the MAH grafted PP and wood particle resulted in a decrease in the crystallization rate of the PP matrix in wood particle/MAH-grafted-PP composites, compared to the MAH grafted PP. Further adding DVB, the PP matrix was modified with MAH and DVB, and the crystallization rate of the PP matrix in WPC composites increased, compared to the MAH co-grafted PP. The results of Arrhenius equation and Hoffman-Weeks extrapolation showed that, under the isothermal crystallization condition of the compatible system, the interface b

关 键 词：木塑复合材料 马来酸酐 二乙烯基苯 等温结晶 结晶动力学 

分 类 号：S781.7[农业科学—木材科学与技术]