摘要：为提高废旧聚丙烯 (WPP) -高梁秸秆粉 (SS) 复合材料的冲击强度和阻燃性能, 以硅烷KH550-钛酸酯TCA201复合偶联剂改性SS (MSS) , 并在WPP-MSS中加入POE-g-MAH进行增强增韧;通过FTIR、XRD、TG对改性前后的SS进行表征, 并考察SS、复合偶联剂及POE-g-MAH用量对复合材料性能的影响;借助热重-红外联用研究WPP-MSS-POE-g-MAH复合材料的热解特性。结果表明:经质量分数为2%的KH550-TCA201复合偶联剂改性后, 复合材料达难燃级别, 冲击强度提高49%;当m (WPP) ∶m (MSS) ∶m (POE-g-MAH) =100∶30∶8时, 复合材料的冲击强度增幅达135.6%;复合材料的热解气在280℃以后释放, 主要为烷烃、烯烃、CO₂等, 同时还有少量醛、酮类气体。

关键词：木塑复合材料；表面改性；热解

Abstract：In order to improve the impact strength and flame retardance of waste polypropylene (WPP) -sorghum straw powder (SS) composites, the SS was modified by Silane KH550-Titanate TCA201 composite coupling agent and then POE-g-MAH was added into the WPP-MSS composites. The SS before and after modification were characterized by FTIR, XRD and TG.The effects of SS, composite coupling agent and POE-g-MAH on the properties of the composites were investigated. The pyrolysis characteristics of WPP-MSS-POE-g-MAH were studied by means of TG-FTIR at nitrogen atmosphere. The results show that after modification by 2% KH550-TCA201, the WPP-MSS composites is nonflammable and the impact strength of the composites is increased by 49%. When mass ratio of WPP to MSS, and to POE-g-MAH are 100, 30 and 8, the impact strength of the composites is increased by 135.6%. The pyrolysis gas of the composite material is released after 280 ℃, mainly for alkanes, olefins, CO₂, etc., whereas a small amount of aldehydes and ketones are produced in the pyrolysis process.

Keywords: wood-plastics composites；surface modification；pyrolysis