Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/41194
標題: Low dielectric thermoset. IV. Synthesis and properties of a dipentene-containing cyanate ester and its copolymerization with bisphenol A dicyanate ester
作者: Lin, C.H.
林慶炫
Hsiao, C.N.
Li, C.H.
Wang, C.S.
關鍵字: dipentene
cyanate ester
BADCY
dielectric constant
dissipation
factor
moisture absorption
ester/bismaleimide blends
molecular-weight
polyimides
behavior
resins
epoxy
期刊/報告no:: Journal of Polymer Science Part a-Polymer Chemistry, Volume 42, Issue 16, Page(s) 3986-3995.
摘要: A 2,6-dimethylphenol-dipentene dicyanate ester (DPCY) was synthesized from the reaction of 2,6-dimethylphenol-dipentene adduct and cyanogen bromide. The proposed structure was confirmed by Fourier transform infrared (FTIR), elemental analysis, mass, and nuclear magnetic resonance (NMR) spectra. DPCY was then cured by itself or cured with bisphenol A dicyanate ester (BADCY). Thermal properties of cured epoxy resins were studied using differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), dielectric analysis (DEA), and thermogravimetric analysis (TGA). These data are compared with those of BADCY. The cured DPCY exhibits a lower dielectric constant (2.61 at 1 MHz), dissipation factor (29.3 mU at 1 MHz), thermal stability (5% degradation temperature and char yield are 429 degreesC and 17.64%, respectively), glass transition temperature (246 degreesC by TMA and 258 T by DMA), coefficient of thermal expansion (33.6 ppm before Tg and 134.1 ppm after Tg), and moisture absorption (0.95% at 48 h) than those of BADCY, but higher moduli (5.12 GPa at 150 degreesC and 4.60 GPa at 150 degreesC) than those of the bisphenol A system. The properties of cured cocyanate esters lie between cured BADCY and DPCY, except for moduli. Moduli of some cocyanate esters are even higher than those of cured BADCY and DPCY. A positive deviation from the Fox equation was observed for cocyanate esters. (C) 2004 Wiley Periodicals, Inc.
URI: http://hdl.handle.net/11455/41194
ISSN: 0887-624X
文章連結: http://dx.doi.org/10.1002/pola.20226
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