纳米氮化硅的表面修饰及分散稳定性研究  

Research on surface modification and dispersion stability of nano silicon nitride

作　　者：张宏艳[1] 程国君[1] 丁国新[1] 

机构地区：[1]安徽理工大学材料科学与工程学院,淮南232001

出　　处：《化工新型材料》2017年第6期67-69,共3页New Chemical Materials

基　　金：国家自然科学基金资助项目(51273001)

摘　　要：用γ-甲基丙烯酰氧基丙基三甲氧基硅烷(KH-570)对纳米氮化硅(Si_3N_4)粒子进行表面修饰,采用开炼混合和硫化工艺制得Si_3N_4/丁苯橡胶(SBR)纳米复合体系,通过红外光谱(FT-IR)、接触角仪、透射电镜(TEM)和橡胶加工分析仪(RPA)对改性前后纳米Si_3N_4粒子及纳米Si_3N_4/SBR复合体系在有机体系中的分散稳定性和力学性能进行分析。结果表明:KH-570分子链成功接枝在纳米Si_3N_4表面并急剧降低了纳米粒子的表面能,有效阻止纳米颗粒团聚,提高了纳米粒子在有机体系中的分散稳定性,改善了纳米复合材料的界面粘结,增强了复合材料的力学性能。制得的改性纳米Si_3N_4/SBR表面能为35.521J/m^2,比未改性纳米Si_3N_4的表面憎水性提高了3倍以上,储能模量达到600kPa,有效提高了纳米Si_3N_4/SBR复合材料的性能。In order to discuss the dispersion stability of Si_3N_4 nanoparticles in organic system,γ-methacryloxypropyl trimethoxy silane（KH-570）was used as modifier to modify the surface of nano-Si_3N_4.Then Si_3N_4/SBR composites were prepared by mixing blend and vulcanization technology.The structural changes of modified nanoparticles were characterized using fourier transform infrared spectroscopy（FT-IR）and contact angle measuring instrument.The dispersion stability and mechanical relaxation behaviors of nano-Si_3N_4 before and after modification by KH-570 in organic system were analyzed by sedimentation stability experiment,transmission electron microscopy（TEM）and rubber process analyzer（RPA）.Results showed that molecular chain of organic coupling agent（KH-570）was successfully grafted the surface of nano-Si_3N_4 and the surface energy of nanoparticles was sharply decreased.Thereby,which can hinder the aggregation of nanoparticles and increased the dispersion stability of nanoparticles in organic system.Simultaneously,the combination of organic KH-570 molecular chain and nanoparticles improved the interfacial bonding and increased mechanical properties of nanocomposites.The surface energy of Si_3N_4/SBR was 35.521J/m^2,more than the unmodified surface hydrophobic property of nano Si_3N_4 of three times.Storage modulus could be reach 600 kPa,effectively improved the performance of Si_3N_4/SBR.

关 键 词：SI3N4 硅烷偶联剂 表面改性 分散稳定性 

分 类 号：TB34[一般工业技术—材料科学与工程] TQ127.2[化学工程—无机化工]