芳纶浆粕(AP)具有优异的力学性能和耐热性能,但是其在聚合物基体中的有效分散一直是研究的难点问题。以磷酸酸化和硅烷偶联剂接枝技术手段改性芳纶浆粕。采用开炼机混炼法制备芳纶浆粕/丁腈橡胶(AP/NBR)复合材料。研究了表面修饰方法对复合材料力学性能和摩擦磨损性能的影响。结果表明:磷酸酸化处理能显著提升浆粕的纤维化程度和表面粗糙度。在硅烷偶联剂接枝改性后,芳纶浆粕会重新形成聚集体。酸化改性芳纶浆粕(a-AP)能有效提高复合材料的弹性模量。硅烷偶联剂改性芳纶浆粕(g-AP)制备的丁腈橡胶复合材料综合性能更为优异。这是由于芳纶浆粕的表面修饰能有效提升复合材料的界面粘结强度。
Aramid pulp (AP) has excellent mechanical properties and heat resistance,but its effective dispersion in polymer matrix has always been a difficult problem.In this paper,aramid pulp was modified by phosphoric acid acidification and silane coupling agent grafting techniques.Aramid pulp/nitrile rubber (AP/NBR) composites were prepared by open mill mixing method.The effects of surface modification methods on the mechanical and tribological properties of composites were studied.The experimental results showed that phosphoric acid treatment significantly improved the degree of fibrillation and surface roughness of the pulp.After grafting modification with silane coupling agent,aramid pulp formed aggregates again.Acid-modified aramid pulp (a-AP) could effectively improve the elastic modulus of the composites.The comprehensive properties of the nitrile rubber composites prepared with silane coupling agent-modified aramid pulp (g-AP) were more excellent,which was because the surface modification of aramid pulp effectively improved the interfacial bonding strength of the composites.
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基金资助
国家自然科学基金(51803155);北京航科精机科技有限公司委托横向项目(H01031);武汉工程大学校基金项目(21QD38)
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