| Summary: | 碩士 === 國立成功大學 === 化學系碩博士班 === 98 === Since doctor Agaskar developed a high yield method on synthesis of polyhedral oligomeric silsesquioxane (POSS) in 1991, its special structure and changeable functional groups attracted widespread interest. The subject of this research focuses on the reactions between POSS and three selected organic molecules with different functional groups and on the porosity of the resultant products.
The organic molecules we use to react with POSS are n-propanol with the hydroxyl group, 1-octene with the carbon-carbon double bond, and allyl alcohol with both the hydroxyl group and the carbon-carbon double bond. POSS reacts with n-propanol and allyl alcohol at ambient conditions. N-propanol has a better reactivity with POSS. We propose that the OH groups of n-propanol molecules nucleophilically attack the Si atoms of POSS, which bear partially positive charge, forming Si-OC3H7 and Si-OH. After 2-hr reaction, Q3 and Q4 bonding types for Si atoms are produced. The wt.% of OC3H7 in the resultant products is less than 10%. This product also contains micro- and meso-pores without calcination. Allyl alcohol can also react with POSS. But interestingly the double bonds can couple between different allyl alcohol molecules. The organic content is higher after 2-hr reaction. Micro- and meso-pores are generated after calcination for the reaction product. 1-Octene does not react with POSS at ambient conditions. We attempted to use microwave-assisted method to promote the hydrosilylation reaction between the double bond of 1-octene and the Si-H bond of POSS. Unfortunately the reaction did not occur.
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