| Summary: | 碩士 === 中國文化大學 === 化學工程與材料工程學系奈米材料碩士班 === 105 === The aim of this study is to develop a high performance and high light transparent titanium oxide (TiO2) / Epoxy resin(Epoxy) nanocomposite for light-emitting diode(LED) encapsulant. Determinev properties about physical properties, mechanical properties, electrical properties, optical properties, thermalproperties, characterization, morphology and reliability. This kind of epoxy resin has high transparency, good weatherability, high temperature resistance, crack resistance, excellent electrical characteristics and low exothermic reaction, the main raw material for LED encapsulant.
Anatase TiO2 nanoparticles were used as high refractive index filler to fabricate excellent UV resistance, high mechanical properties and high refractive index epoxy nanocomposites.
In this study, using 3-Aminopropyltrimethoxysilane(APTMS) grafted nano titanium surface modification by a sol-gel method and TiO2 and APTMS-m-TiO2 were mixed into epoxy resin (Epoxy) by in-situ polymerization. After mixing, the epoxy resin nanocomposite was injected into the mold, baked at 100℃ for 1 hour, and then baked at 120℃ for 4 hours to prepare a transparent modified titanium dioxide(TiO2) / epoxy resin(Epoxy) nanocomposite.
For Epoxy Add prepared TiO2 and MPS-m-TiO2 nanocomposites with a different number of grams of composition (per 100 grams of resin contained in the composition of the number of grams). Explore the different components of the number of grams of TiO2 and MPS-m-TiO2 nanometer morphology of Epoxy composites(SEM), physical properties (density and contact angle), mechanical properties (hardness, abrasion index, flexural strength, impact strength and adhesive strengh), thermal properties (TGA, CTE, HDT and VST), the optical properties (transmittance, refractive index), reliability of the performance and impact.
The experimental results that, through test of TGA, FT-IR, XRD and XPS can prove the success of silane coupling agent grafted via.And at particle size analysis, also can prove APTMS-m-TiO2 is bigger than TiO2.
The TiO2 and APTMS-TiO2 were added to the Epoxy nanocomposite parts, a test of physical properties (density and porosity) effectively increasing, in mechanical properties test results, hardness and abrasion index are rising, while the impact of strength is fall；thermal properties, heat resistance improving effect is more significant. In optical properties test, refractive index is rising.
The above results indicate that adding TiO2 is beneficial to promote each characteristic of Epoxy nanocomposite。APTMS-m-TiO2 is better than TiO2 on Epoxy nanocomposite, it shows that APTMS-m-TiO2 diversion is better.
It can be proved that in a long period of high temperature and UV light that add transmittance of TiO2 the loss of rate .It shows that add TiO2 is conducive to enhance both of the heat resistant of materials and the UV exposure,TPTMS-m-TiO2 / Epoxy nanocomposite is better than TiO2 / Epoxy nanocomposite effect more remarkable.
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