Synthesis and Characterization of Tricyclodecane-based Modified PMMA and Epoxy Composites
| Autor: | TSAI, CHIH-WEI, 蔡志偉 |
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| Rok vydání: | 2017 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 105 In this study, the starting monomer adamantane and dicyclopentadiene are the five-carbon olefin materials, isolated from petroleum refinement exhibit highly utilization potential and broad applications. The aim of this study, an efficient route for the synthesis of derivatives of adamantane and dicyclopentadiene and was designed to prepare serials of tricycloalkyl-containing methacrylate polymers and epoxy resins. The effects of structure-property relationships of the tricycloalkyl-containing methacrylate polymers and epoxy resins types and contents obtained were extensively investigated in detail by determining the chemical structures, microstructure morphology, thermal stability, thermo-mechanical, mechanical properties, dielectric and optical characteristics by FT-IR, NMR, GPC, XRD, SEM, AFM, DSC, TGA, DMA, TMA, UV-vis, water absorption and dielectric constant and compared with those of commercially available PMMA and diglycidyl ether of bisphenol-A epoxy EP904. The obtained results indicate that the microscopic and structural properties reflect the fine homogenous dispersion and better ordering and enhanced crystallinity by incorporation of modified tricycloalkyl into methacrylate polymer and epoxy resins matrix. As expected, the incorporation of tricycloalkyl substituents as the pendant group on the methacrylate polymer or into the chain of the epoxy resin showed great contributing in enhancement of the thermal combined with high transparency in the UV-visible region and long-term thermal resistance stabilities, and mechanical properties as well as the lower CTE, water absorption and dielectric constant. These results indicate that both the microstructure and physical properties strongly significant changes depend on the bulky, hydrophobic, and thermally stable tricycloalkyl of strained ring geometry, and the steric hindrance of tricycloalkyl moieties causes inefficient chain packing, which induces free volume and decreases the activity of the main chain and limited the movement of polymer chains in PMMA and epoxy structure. Therefore, developed high-performance transparent polymers with high heat resistance, high glass transition temperature (Tg), low dielectric constant, and excellent mechanical properties have attracted considerable academic and industrial attention due to their properties for their possible applications in various high-technology fields such as microelectronic, optoelectronic, communication technology, aerospace, biomedical science and national defense industry. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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