Surface Free Energy, Thermal Properties, and Self-Assembly in Solution State of Poly(4-vinyl phenol) Tethered to Polyhedral Oligomeric Silsequioxane
| Autor: | Chou, Hsin-Yi, 周幸儀 |
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| Rok vydání: | 2009 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 97 Polyhedral oligomeric silsequioxanes-polyacetoxystyrene (POSS-PAS), a novel inorganic-organic polymer, was synthesized through nitroxide-mediated radical polymerization (NMRP) by using a novel macroinitiator, POSS-2,2,6,6-tetramethylpiperidinooxy (POSS-TEMPO). An amphiphilic block copolymer, POSS-PVPh, was obtained from the hydrolysis of POSS-PAS copolymer. In this dissertation, we focus on the surface free energy, self-assembly in solution and thermal property of POSS-PVPh copolymer. We find that the POSS nanoparticle decrease the surface free energy of POSS-PVPh thin film when it populate on surface and POSS-PVPh polymer thin films possessed extreme low surface free energy after thermal treatment. The miscibility and specific interaction behavior of POSS-PVPh/PMMA was another important subject in this dissertation. From FTIR results, the POSS-PVPh/PMMA blends possess a lower fraction of hydrogen-bonded carbonyl groups relative to those of PVPh/PMMA blends due to the hinder effect of POSS moiety. However, POSS-PVPh/PMMA blends possess higher Tg than that of the PVPh/PMMA blends at the same composition. This phenomenon suggests that the POSS nanoparticle hinder the large-scale segmental motions of the polymer chains and results in higher Tg. For phase behavior in solution, POSS-PVPh copolymer would aggregate in THF/toluene or acetonitrile and self-assembled to well-defined nanostructure. Through changing the composition of THF/toluene mix solution or the length of PVPh segment, the novel morphologies of POSS-PVPh could be observed. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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