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Preparation, curing properties, and phase morphology of epoxy‐novolac resin/multiepoxy‐terminated low‐molecular‐weight poly(phenylene oxide) blend
Author(s) -
Wang Huan,
Mo Jingzhao,
Shentu Baoqing,
Weng Zhixue
Publication year - 2014
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.23810
Subject(s) - curing (chemistry) , materials science , differential scanning calorimetry , phenylene , thermal stability , epoxy , oxide , polymer chemistry , epichlorohydrin , fourier transform infrared spectroscopy , chemical engineering , composite material , polymer , metallurgy , physics , engineering , thermodynamics
The multiepoxy‐terminated low‐molecular‐weight poly (phenylene oxide) (PPOE) was synthesized by modifying the terminal hydroxyl group of poly(2,6‐dimethyl‐1,4‐phenylene oxide) (PPO) with epoxy‐novolac resin (EPN). The curing kinetics, phase morphology, and thermal stability of the cured EPN/PPOE blends were investigated and compared to the unmodified EPN/PPO and EPN/EPPO (epichlorohydrin‐modified PPO) blends. As revealed by the Fourier transform infrared and differential scanning calorimetry analyses, PPOE took part in the curing reaction and formed a crosslinked structure with EPN. The curing rate of EPN/PPOE blends first increased and then decreased with the increase of PPOE fraction. PPOE had both catalytic and steric hindrance effects on the curing reaction. EPN/PPOE blends showed faster curing rate and higher degree of curing than the corresponding EPN/PPO and EPN/EPPO blends. The reactive blending improved the dispersion of PPOE in EPN matrix and the thermal stability of the blend. POLYM. ENG. SCI., 54:2595–2604, 2014. © 2013 Society of Plastics Engineers