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摘要
使用新型偶联剂KEL和VTH以及传统偶联剂KH560分别对Al2O3进行改性,以改性Al2O3为导热填料,液体硅橡胶(LSR)为基体,制备了3种改性Al2O3/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Al2O3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Al2O3制备的Al2O3/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。
Abstract
New coupling agents KEL and VTH and traditional coupling agent KH560 were used to modify Al2O3,respectively,and then three kinds of modified Al2O3/LSR composites were prepared with modified Al2O3 as the thermally conductive filler and liquid silicone rubber (LSR) as the matrix.The modified Al2O3/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 Al2O3,which effectively enhanced the comprehensive performance of the composites.When 0.6g of VTH was added,for the Al2O3/LSR composites prepared by VTH-modified Al2O3,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 0.424W/(m·K).Compared with the coupling agents KEL and KH560,the modification effect of VTH was better.
关键词
氧化铝
/
表面改性
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导热系数
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液体硅橡胶
Key words
aluminum oxide
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surface modification
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thermal conductivity
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liquid silicone rubber
Al2O3表面改性对液体硅橡胶复合材料综合性能的影响[J].
化工新型材料, 2025, 53(11): 99-103 DOI:10.19817/j.cnki.issn1006-3536.2025.11.004
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基金资助
广西重点研发计划项目(桂科AB23026127)
