摘要
使用新型偶联剂KEL和VTH以及传统偶联剂KH560分别对Al_(2)O_(3)进行改性,以改性Al_(2)O_(3)为导热填料,液体硅橡胶(LSR)为基体,制备了3种改性Al_(2)O_(3)/LSR复合材料,通过傅里叶变换红外光谱仪、X射线衍射仪、热重分析仪、电子万能试验机等分别对改性复合材料的官能团、化学结构、热稳定性及力学性能进行表征和测试。结果表明:偶联剂KEL和VTH在改善Al_(2)O_(3)分散性和界面相容性方面表现出色,有效提升了复合材料的综合性能;当VTH用量为0.6g时,VTH改性Al_(2)O_(3)制备的Al_(2)O_(3)/LSR复合材料断裂伸长率提升至298.0%,体系黏度降至6288mPa·s,黏度降低了45.3%,导热系数为0.424W/(m·K);与偶联剂KEL和KH560相比,VTH改性效果更好。
New coupling agents KEL and VTH and traditional coupling agent KH560 were used to modify Al_(2)O_(3),respectively,and then three kinds of modified Al_(2)O_(3)/LSR composites were prepared with modified Al_(2)O_(3)as the thermally conductive filler and liquid silicone rubber(LSR)as the matrix.The modified Al_(2)O_(3)/LSR composites were characterized and tested for functional groups,chemical structure,thermal stability,and mechanical properties by Fourier transform infrared spectroscopy(FT-IR),X-ray diffractometer(XRD),thermogravimetric analyzer(TGA),and electronic universal testing machine(EUTM),respectively.The results showed that the coupling agents KEL and VTH performed well in improving the dispersion and interfacial compatibility of Al_(2)O_(3),which effectively enhanced the comprehensive performance of the composites.When 0.6g of VTH was added,for the Al_(2)O_(3)/LSR composites prepared by VTH-modified Al_(2)O_(3),the elongation at break of the composites was enhanced to 298.0%,the viscosity of the system was decreased to 6288mPa·s,the viscosity was reduced by 45.3%,and the thermal conductivity was 0.424 W/(m·K).Compared with the coupling agents KEL and KH560,the modification effect of VTH was better.
作者
窦鹏
卢泽东
朱庆
李方利
余传柏
Dou Peng;Lu Zedong;Zhu Qing;Li Fangli;Yu Chuanbai(School of Materials Science and Engineering,Guilin University of Technology,Guilin 541000)
出处
《化工新型材料》
北大核心
2025年第11期99-103,共5页
New Chemical Materials
基金
广西重点研发计划项目(桂科AB23026127)。
关键词
氧化铝
表面改性
导热系数
液体硅橡胶
aluminum oxide
surface modification
thermal conductivity
liquid silicone rubber
