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|標題:||Fluorinated benzoxazines and the structure-property relationship of resulting polybenzoxazines||作者:||Lin, C.H.
|關鍵字:||dielectric properties;glass transition;structure-property relations;thermosets;amine-based polybenzoxazines;high-performance thermosets;thermal-properties;epoxy-resin;polyimides;maleimide;polymers;monomers;polymerization;phthalonitrile||Project:||Journal of Polymer Science Part a-Polymer Chemistry||期刊/報告no：:||Journal of Polymer Science Part a-Polymer Chemistry, Volume 46, Issue 15, Page(s) 4970-4983.||摘要:||
Three fluorinated benzoxazines (14-16), which cannot be synthesized by the traditional one-step approaches, were synthesized by a three-step procedure using fluorinated aromatic diamines (2-4) as starting materials. The structures of the monomers were confirmed by (1)H NMR, IR, and high-resolution mass spectra. The low dielectric thermosets, P(14-16), were prepared by ring-opening of (14-16). IR analysis was utilized to monitor the ring-opening reaction of (14-16) and to propose the structures of P(14-16). The thermal and dielectric properties of P(14-16) were studied and compared with a nonfluorinated polybenzoxazine P(13), which is derived form the ring-opening of 2,2-bis(4-aminophenoxy)phenyl)propane (1). Besides, the structure-property relationship of the P(13-16) is discussed. According to T(g) measurement, the ortho-positioned CF(3) substituents impart greater steric hindrance for ring-opening of benzoxazines than CF(3) substituents of hexafluoropropane. Incorporating a biphenol F-based benzoxazine, (F-a), into fluorinated benzoxazines (15-16) can dilute the effect of ortho-positioned CF(3) substituents on steric hindrance, leading to a higher crosslinking density and consequently a higher Tg.
|Appears in Collections:||化學工程學系所|
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