荧光有机硅导热弹性体的制备与性能

Preparation and Performance of Fluorescent Silicone Thermal Conductive Elastomers

以9-乙烯基蒽与端甲基侧氢硅油为原料,在铂金催化剂作用下,通过硅氢加成反应合成了3种荧光硅油(AH1,AH2和AH3),利用核磁共振和傅里叶变换红外光谱表征荧光硅油的化学结构,并利用荧光分光光度计和紫外-可见吸收分光光度计测试其光学性能。将合成的荧光侧氢硅油作为交联剂与乙烯基硅油在高温下进行交联固化,得到加成型荧光有机硅弹性体(FPDMS),探究了荧光基团的引入对有机硅弹性体硬度、交联网络、力学性能和热稳定性的影响。结果表明,荧光弹性体具有较低的硬度(13.9~33.4H00)、较小的交联密度、优异的热稳定性和力学性能,与无荧光原料弹性体相比,荧光有机硅弹性体拉伸强度提高了0.59~2.27倍。在导热材料的渗油测试中,荧光弹性体可对渗出物质荧光示踪,可实时监测其扩散情况;此外,还对渗出物质的扩散距离-时间曲线进行了拟合,定量评价渗油速率,以期保护电子器件的正常使用,为渗油研究提供了新思路。

Fluorescent silicone oils(AH1,AH2 and AH3)were synthesized using hydrosilylation with 9-vinyl anthracene and methyl-terminated silicone oil as raw material,and platinum as Karstedt catalyst.The chemical structure of the fluorescent silicone oils was characterized by NMR and FT-IR,and its optical properties were characterized by fluorescence spectrophotometer and ultraviolet visible absorption spectrophotometer.The additional fluorescent silicon elastomers(FPDMS)were prepared using fluorescent silicon oil as cross-linker,and vinyl-terminated silicone oil as base polymer through crosslinking curing reaction at high temperature.The effects of fluorescent silicon groups on the silicon elastomer,including its hardness,crosslinking network,mechanical properties,and thermal stability,were analyzed.Results show that the fluorescent elastomers have the lower hardness(13.9~33.4 H00),lower crosslinking density,better thermal stability and better mechanical properties.Compared with the raw material elastomer,the tensile strength of the fluorescent silicone elastomer is increased by 0.59~2.27 times.In the oil bleeding test of elastomers,fluorescent silicon elastomers can fluorescently trace the exudation of substances and monitor its exudation in real time.Meanwhile,the diffusion range-time curve of the exudate was fitted to quantitatively evaluate the oil permeation rate in order to protect the normal use of electronic devices.