Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/41224
標題: Fluorinated benzoxazines and the structure-property relationship of resulting polybenzoxazines
作者: Lin, C.H.
林慶炫
Chang, S.L.
Lee, H.H.
Chang, H.C.
Hwang, K.Y.
Tu, A.P.
Su, W.C.
張厚謙
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
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.
URI: http://hdl.handle.net/11455/41224
ISSN: 0887-624X
文章連結: http://dx.doi.org/10.1002/pola.22823
Appears in Collections:化學工程學系所

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