低介電Benzoxazine共聚物及聚酯之關係

黃信樫

doi:10.6845/NCHU.2011.00147

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低介電Benzoxazine共聚物及聚酯之關係

Development of Low-Dielectric Benzoxazine Copolymers and Poly(phenylene oxide)

黃信樫 , Masters　　Advisor：林慶炫　　

繁體中文 DOI： 10.6845/NCHU.2011.00147

氰酸酯；芳香族親核性取代反應； Benzoxazine ； PPO

Abstract │ Reference (23) │ Altmetrics

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We synthesize compound(1~2) via three-step synthetic method using typical aromatic diamines – DDM,ODA and via traditional method synthesize compound(3-6). The structures of the monomers were confirmed by 1H-NMR, 13C-NMR, 1H-1H 2D NMR and 1H-13C 2D NMR spectra. The high crosslining polymer was prepared co-curing with compounds(1~6) and BADCY. The spectraland analytical data supported the possibilities of further polymerization through the insertion of the phenolic -OH of polybenzoxazine to cyanate group to form the intermediate iminocarbonate, which further induce curing of cyanate ester to form polycyanurate. For copolymers, the iminocarbonate linkages, resulting from the reaction of phenolic OH of polybenzoxazine and high polar Functional Group OCN group, were able to reduce dielectric constant. The thermal properties of (3-6) can be enhanced via the copolymerization, and the water absorption of BADCY was reduced via the copolymerization.
Polyphenylene oxide(PPO) possesses excellent electrical properties (low-dielectric constant) and thermal resistant , however owing to high molecular weight, its reactivity and process ability are very low for electronic applications. The nucleophilic aromatic substitution reaction (SNAr) has been known as a very effective one for the formationof aromatic ether groups and utilized in the synthesis of many organic and polymeric compounds. A properly activated nitro group is also displaced readily, but it produces a reactive nitrite ion as a byproduct which causes side reactions at elevated temperature. However,trifluoromethyl groups act as an effective activating group for the nucleophilic nitro displacement reaction at relatively high temperature due to the inertness of perfluoroalkyl groups to the nitrite ions. Another advantage of the CF3 activating group is that the incorporation of fluorines into the polymer chain provides some desirable properties such as low dielectric constant, low moisture absorption, and good solubility.

Reference ( 23 ) 〈TOP〉

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