| Summary: | 碩士 === 國立中央大學 === 化學工程與材料工程研究所 === 90 ===
This project is base on sol-gel process, which is using inorganic SiO2 to produce hybrid is blended from Epoxy and SiO2 together. Also test the hybrid’s heat-resistant property by using the TGA process.
To beginning with the inorganic system (SiO2) that is use Tetraethoxysilane, water, and Ethanol under different acidity and alkalinity catalysts and proceeded with hydrolysis-condensation reaction and the product which is called precursor. Also blended precursor and organic system (epoxy) then proceeded with curing reaction. According to the reaction then will produce the epoxy resin and SiO2 organic/inorganic mixtures. This method is called sol-gel polymerization.
Additional in the organic system, which is focus on effect of the inorganic SiO2’s epoxy varnish to the accelerating agent (2-MI). In the meantime, to proceed analyzed the epoxy varnish under the inorganic SiO2 the effect of reaction temperature by using isothermal DSC method.
In conclusion, there have three main conditions in organic-inorganic hybrids process.
1.Using silane coupling agent can provide good covalence between organic and inorganic also it has change amount of the silane coupling agent from 1% to 100%. This is discussing is it help to rise up the heat-resistant property of the organic/inorganic hybrid.
2.Increasing amount of inorganic SiO2 in hybrid from 1% to 10%. This is to discussing is it help to rise up the heat-resistant property of the organic/inorganic hybrid.
3.By using different silane coupling agents, individually, itself carry two KBE-402 (γ-glycidoxypropyl-methyldiethoxysilane) and three KBM-403 (γ-glycidoxypropyl-trimethoxysilane) to proceeded hydrolysis reaction, this is to discussing difference of the heat-resistant property between organic/inorganic hybrids.
The conclusion has shown, the method of precursor under acid catalyst can produce better heat-resistant property of the epoxy / SiO2 hybrid to compare with base catalyst. In the meantime, use the method of precursor to produce hybrid has better heat-resistant property than direct blend method products.
However, the epoxy varnish caused add inorganic SiO2 has resulted the maximum of exothermic peak has been increase from 166℃ to 197℃. At the same time it has been change the accelerating agent quantities the resulted has exhibited the position of maximum of exothermic peak didn’t obviously change, also exhibited hybrid doesn’t change the position of maximum of exothermic peak caused to increase accelerating agent. But after inorganic SiO2’s epoxy varnish has been add 1.17% accelerating agent and through the isothermal test and curing reaction, it can resulted when reaction temperatures in 170℃ has been processed one hour latter can produce great hybrid with heat-resistant property.
Additional, by add silane coupling agent’s hybrid into inorganic system which is made from epoxy / SiO2, it has been to heat weight less analysis (TGA) and found the heat weight less rate has decrease. It is show that silane-coupling agent between organic and inorganic has provided part of covalent bond. Therefore it also can promote hybrid’s heat-resistant property. In the meantime, also it can found out after add 2.5% silane coupling agent; it can rise up hybrid’s heat-resistant property.
Besides, resulted from DSC and TGA test, the quantity of the inorganic SiO2 has increase in hybrid it can help to transfer temperature from hybrid glass and promote the heat-resistant property. In addition from FTIR has shown in inside the organic-inorganic hybrids has two elements which is SiO2 and epoxy.
In conclusion, this graph shows it has move on high temperature by using different silane-coupling agent to produce hybrid and through the TGA method, it is shown there all can achieved the efficiency of heat-resistant property, by add two kinds of silane-coupling agent.
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