含硫偶联剂对木粉/橡胶-塑料三元复合材料力学性能及耐热性能的影响

《复合材料学报》优先在线发表论文。

摘  要：以再生高密度聚乙烯（HDPE），沙柳木粉和废轮胎胶粉为原材料，含硫偶联剂Si69为界面相容剂，采用模压法制备木粉/橡胶—塑料三元复合材料。考察Si69对木粉/橡胶—塑料三元复合材料力学性能及耐热性能的影响，并采用FTIR和SEM分析Si69改性前后废轮胎胶粉的表面特性及木粉/橡胶—塑料三元复合材料的微观断面形貌。研究结果表明：Si69与废轮胎胶粉发生了化学反应。当Si69添加5wt%时，木粉/橡胶—塑料三元复合材料的界面结合较佳，力学性能及耐热性能较优，其中弯曲强度，弯曲模量，拉伸强度较未添加时分别提高了13.85%，7.24%，6.63%；维卡软化温度和热变形温度较未添加时分别提高了6.95℃和8.70℃，Si69可在一定程度上提高木粉/橡胶—塑料三元材料的耐热性能。Si69添加7wt%时，木粉/橡胶—塑料三元复合材料的缺口冲击强度可达到3.99 kJ·m-2。

关键词：Si69；界面相容剂；复合材料；力学性能；耐热性能

Abstract: The regenerated high-density polyethylene, salix wood powder and waste tire rubber powder were used as the raw materials, and sulfur-containing coupling agent Si69 as the interface compatibilizer, wood powder/rubberr-plastic ternary composites were prepared by molding method. The influences of Si69 on the mechanical properties and heat resistance of wood powder/rubber-plastic ternary composites were investigated, the waste tire rubber powder surface characteristics before and after Si69 modification and the microstructure of wood powder/rubber-plastic ternary composites were analyzed by FTIR and SEM. The research results show that Si69 has a chemical reaction with waste tire rubber powder. When the contents of Si69 are 5wt%, the interfacial compatibility of wood powder/rubber-plastic ternary composites is better, mechanical properties and heat resistance are good, the flexural strength, flexural modulus and tensile strength are increased by 13.85%, 7.24%, 6.63%, respectively, which compared with no adding; The vicat softening temperature and heat deformation temperature of wood powder/rubber-plastic composites are increased by 6.95℃ and 8.70℃, respectively. heat resistance of wood powder/rubber-plastic composites is improved by Si69 to some extent. When the contents of Si69 are 7wt%, the notched impact strength of wood powder/rubber-plastic ternary composites can reach 3.99 kJ·m-2.

Keywords: Si69; interface compatibilizer; composites; mechanical properties; heat resistance

作者：王伟东等，内蒙古农业大学材料科学与艺术设计学院，内蒙古 呼和浩特

通讯作者：李奇，内蒙古农业大学材料科学与艺术设计学院，内蒙古 呼和浩特

全文详见中国知网学术期刊优先数字出版。