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

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。结果表明:Si69与废轮胎胶粉发生了化学反应。当Si69添加量为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Si69的木粉/橡胶-塑料三元复合材料分别提高了13.85%、7.24%和6.63%；维卡软化温度和热变形温度较未添加Si69的木粉/橡胶-塑料三元复合材料分别提高了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添加量为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 k·Jm-2。 

Effect of sulfur-containing coupling agent on mechanical properties and heat resistance of wood powder/rubber-plastic ternary composites

The regenerated high-density polyethylene(HDPE), 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/rubber-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 results show that Si69 has a chemical reaction with waste tire rubber powder. When the contents of Si69 is 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 Si69; 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 is 7wt%, the notched impact strength of wood powder/rubber-plastic ternary composites can reach 3.99 k·Jm^-2.