纳米TiO2、ZrO2对苯基硅橡胶性能的影响研究
毕业论文关键词：LED封装；纳米粒子；苯基硅橡胶；纳米复合材料
Research on Different Contents of PhenylSilicone Rubber Modified with Nanoparticles (TiO2\ZrO2)
Abstract This article is mainly for a modification of Silicone Rubber nanocomposite materialused as encapsulant for LED packaging, by means of adding Nano-TiO2, ZrO2 surface-modified with silane coupling agent. Then, the mechanical properties, optical properties, dielectric properties, thermal conductivity of silicone rubber nanocomposites were systematically studied. The research results showed that refractive index of the silicone rubber nanocomposites increased with particles content. When the nano TiO2 and ZrO2 content were 3wt%, the prepared nanocomposite kept good refractive index, which was 1.573 and 1.571 respectively.Thedielectric constant ofsilicone rubber nanocomposite withsurface-modified particles particles increases with particles content more than the nanocomposite without surface-modified particles. When nano-ZrO2 and TiO2 content were 3wt%, the prepared nanocomposite kept the highest volume resistivity.The volume resistivity of silicone rubber composites adding with modified ZrO2 and TiO2increased from 2.6×1013Ω•cm to 17.97×1013,26×1013Ω•cm respectively.Thermal conductivity of the phenyl silicone rubber nanocomposites increased firstly and then decreases. when the nano-ZrO2 content were 0.01wt%,and nano-TiO2 content were 0.6 wt%, the prepared nanocomposite presented best thermal conductivity, which were 0.199,and 0.215 W•m-1•K-1 respectively.
Keywords: LED packaging;Nanoparticles; Phenyl silicone rubber; Nanocomposite
目录
1绪论1
1.1LED简介.1
1.1.1LED封装介绍1
1.1.2LED封装材料的研究意义3
1.1.3LED封装材料的性能要求3
1.2LED封装用材料的研究进展.4
1.2.1环氧树脂.4
1.2.2有机硅改性环氧树脂.4
1.2.3有机硅材料.5
1.3纳米粒子有硅复合材料的研究进展.6
1.3.1TiO2、ZrO2纳米粒子的性质.6
1.3.2无机纳米粒子的表面修饰.6
1.3.3无机纳米粒子在硅橡胶中的应用.8
1.3.4有机硅橡胶/无机纳米复合材料的制备方法8
1.4课题研究的目的和意义.9
1.4.1研究目的.9
1.4.2研究意义.9
2实验部分10
2.1实验用主要原料.10
2.2实验用仪器设备.10
2.3实验过程11
2.3.1纳米粒子TiO2和ZrO2的表面修饰11