热氧老化对木橡塑三元复合材料力学性能及耐热性能的影响  

Effect of heat oxygen aging on mechanical properties and heat resistance of wood rubber plastic ternary composites

作　　者：王伟东[1,2] 李奇 赵雪松[3] 张阁昊 WANG Wei-dong;LI Qi;ZHAO Xue-song;ZHANG Ge-hao(College of Material Science and Art Design,Inner Mongolia Agricultural University,Huhhot 010018,China;Inner Mongolia Key Laboratory of Desert Shrub Fibrosis and Energy Proceeding,Huhhot 010018,China;College of Mechanical and Electrical Engineering,Inner Mongolia Agricultural University,Huhhot 010018,China)

机构地区：[1]内蒙古农业大学材料科学与艺术设计学院,呼和浩特010018 [2]内蒙古自治区沙生灌木纤维化及能源化重点实验室,呼和浩特010018 [3]内蒙古农业大学机电工程学院,呼和浩特010018

出　　处：《材料工程》2021年第8期139-144,共6页Journal of Materials Engineering

基　　金：国家自然科学基金项目(31660177)。

摘　　要：合理利用废旧橡塑,可以避免其环境污染,同时也可改良复合材料性能。本研究采用再生高密度聚乙烯(PE-HD)、沙柳木粉和废旧轮胎粉等原材料,通过模压成型制备木橡塑三元复合材料(WRPC)。探究不同热氧老化时间作用下WRPC力学性能及耐热性能的变化规律,采用FTIR和SEM分析其老化机理和表面形貌。研究结果表明:热氧老化降低了WRPC的力学性能,老化100 h后,静曲强度、弹性模量、拉伸强度和冲击强度保持率分别为93.40%,84.74%,79.75%和82.63%;储能模量和损耗模量保持率分别为84.34%和89.18%,材料刚性和阻尼性能降低;维卡软化温度和热变形温度先上升后下降,材料抵抗外力变形的能力减弱。FTIR和SEM分析可知,老化过程中WRPC发生了氧化反应,羰基指数先上升后下降,WRPC表面出现了裂纹和孔洞。Reasonable use of waste rubber and plastic can avoid environmental pollution and improve composite materials performance.Recycled high density polyethylene(PE-HD),salix wood powder and waste tire powder were used as raw materials to prepare wood rubber plastic ternary composite materials(WRPC)by compression molding.The change rules of mechanical properties and heat resistance of WRPC were investigated under different heat oxygen aging time,and aging mechanism and surface topography were analyzed by FTIR and SEM.The study results indicate that heat oxygen aging reduces the mechanical properties of WRPC.After aging for 100 h,the retention rates of static flexural strength,elastic modulus,tensile strength and impact strength are 93.40%,84.74%,79.75%and 82.63%.The retention rates of storage modulus and loss modulus are 84.34%and 89.18%.Material rigidity and damping performance are all decreased.The vicat softening temperature and heat distortion temperature show an upward trend and then a downward trend.The ability of materials to resist external deformation is reduced.According to FTIR and SEM analysis,the oxidation reaction occurs on the surface of WRPC during aging.The carbonyl index shows an upward trend and then a downward trend.Cracks and holes appear on the surface of WRPC.

关 键 词：热氧老化 三元复合材料 性能 氧化反应 孔洞 

分 类 号：TQ325.1[化学工程—合成树脂塑料工业]