| Summary: | 碩士 === 國立嘉義大學 === 應用化學系研究所 === 99 === A new class of Poly(2,6-dimethyl-1,4-phenylene oxide)s (PPO) containing different amine、ether pendant groups were synthesized and characterized. In the research, we explored the physical、chemical properties and possible applications of products. The amine-substituted PPOs were prepared through bromination of PPO in chlorobenzene followed by treatment with dibutylamine、dimethylamine、butylamine、aniline and polyol, respectively to yield the amine-substituted and ether- substituted PPOs. These polymers were studied by nuclear magnetic resonance spectroscopy (NMR), Fourier Transform Infrared Spectrometer (FT-IR), differential scanning calorimetry (DSC), thermogravimetric analyzer (TGA), gel permeation chromatography (GPC), and parallel-plate capacitor.
The glass transition temperature (Tg value) varied with different types of amine substituents. DMA-PPO exhibited the highest Tg value as compared to other analogous and the Tg value increased proportionally to the molar ratios of functional group. The DBA-PPO, on the other hand, exhibited the lowest Tg value which decreased proportionally as the substitution ratios increased. All the thermal decomposition temperature (Td5%) decreased after the replacement of amine functional groups.
The amine-functionalized PPO was dissolved in THF and then made into film for the dielectric constant and dielectric loss measurements. The dielectric constant Dk ranged from 2.20 to 2.63 and the dissipation factor Df ranged from 0.00 to 0.018 which were much lower than that of conventional glass epoxy copper clad laminate (Dk around 4.7-4.8 with Tg at 130℃). Thus, the amine-functionalized PPOs can be considered for potential applications of low dielectric materials in the future.
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