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采用化学改性方法将自制的纳米ZnO颗粒接枝到含氢聚硅氧烷(PMHS)分子链上,以该接枝聚合物(ZnO–PMHS)和端乙烯基聚硅氧烷为反应物,在铂催化作用下合成了一种可用于电子封装的透明有机硅纳米ZnO复合涂层。研究了纳米ZnO含量对涂层力学性能和光学性能的影响,通过扫描电镜、傅里叶变换红外光谱和热重分析,对纳米ZnO改性前后的涂层进行了表征。研究表明,ZnO纳米颗粒通过化学接枝连接到聚合物分子链上;ZnO纳米颗粒的接枝反应改变了复合涂层的折光指数,当纳米ZnO含量为0.06%时,复合涂层在640 nm处的透光率达到80%以上,对300 nm以下的紫外光的屏蔽效率达到90%以上;与未含纳米ZnO的涂层相比,有机硅纳米ZnO复合涂层的耐紫外老化能力提高了5倍,初始热分解温度提高25%,热分解残留质量提高15%,表现出优异的耐热和耐紫外老化性能,满足电子产品的封装要求。
The self-made nano-ZnO particles were grafted onto the molecular chain of hydrogen-containing polysiloxane (PMHS) by chemical modification. Using the graft polymer (ZnO-PMHS) and terminal vinyl polysiloxane as reactants, A transparent organic silicon nano-ZnO composite coating for electronic packaging was synthesized by platinum catalysis. The effects of nano-ZnO content on the mechanical properties and optical properties of the coatings were investigated. The coatings before and after nano-ZnO were characterized by scanning electron microscopy, Fourier transform infrared spectroscopy and thermogravimetric analysis. The results show that the ZnO nanoparticles are chemically grafted to the polymer chains. The grafting reaction of ZnO nanoparticles changes the refractive index of the composite coating. When the nano-ZnO content is 0.06%, the composite coating at 640 nm Of the light transmittance of more than 80% of the UV below 300 nm shielding efficiency of more than 90%; compared with the coating without nano-ZnO, organic silicon nano-ZnO composite coating UV aging resistance increased by 5 Times, the initial thermal decomposition temperature increased by 25%, pyrolysis residue quality increased by 15%, showing excellent heat and UV aging resistance to meet the packaging requirements of electronic products.