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Synthesis and Characterization of Dimethyladamantyl Unit-Containing Semi-Alicyclic Polybenzoxazole 三枝, 靖夫 Saegusa, Yasuo 高澤, 秀生 Takazawa, Hideo 森川, 浩 Morikawa, Hiroshi Dimethyladamantyl unit semi-alicyclic polybenzoxazole silylation method high thermal stability low dielectric constant application/pdf 3,5-Dimethyladamantyl unit-containing semi-alicyclic poly(o-hydroxy amide), precursor polymer of the polybenzoxazole, of high molecular weight was synthesized by the low-temperature solution polycondensation of 5,7-dimethyladamantane-1,3-dicarbonyl chloride with N,N',O,O'-tetrakis(trimethylsilyl)-substituted 4,4'-diamino-3,3'-dihydroxybiphenyl. Subsequent thermal cyclodehydration of the precursor polymer at 300°C successfully afforded the polybenzoxazole with high molecular weight. The poly(o-hydroxy amide) dissolved in polar aprotic solvents, whereas the polybenzoxazole was insoluble in any organic medium tested. The polybenzoxazole was stable up to around 400°C under nitrogen and had a low dielectric constant of 2.866. The mechanical properties of the polybenzoxazole film were excellent, its tensile strength, elongation at break, and tensile modulus were 110 MPa, 6%, and 3.3 GPa, respectively. 神奈川工科大学 2009-03-20 eng departmental bulletin paper VoR https://doi.org/10.34411/00001028 http://hdl.handle.net/10368/21389 https://kait.repo.nii.ac.jp/records/1035 10.34411/00001028 AN10074179 09161902 神奈川工科大学研究報告.B,理工学編 33 21 25 https://kait.repo.nii.ac.jp/record/1035/files/kkb-033-005.pdf application/pdf 705.9 kB 2012-02-28