Reactive & Functional Polymers, Vol.68, No.8, 1185-1193, 2008
Low dielectric epoxy resins from dicyclopentadiene-containing poly(phenylene oxide) novolac cured with dicyclopentadiene containing epoxy
Dicyclopentadiene-containing low molecular weight poly(phenylene oxide) (PPO) novolac (DCPD-PPO) was prepared by redistributing regular PPO with dicyclopentadiene phenol novolac (DCPDNO). using benzoyl peroxide (BPO) as an initiator in toluene. The synthesized dicyclopentadiene-containing redistributed-PPO novolac (DCPD-PPO) with terminal phenolic hydroxyl group and low molecular weight was used in the modification of dicyclopentadiene containing epoxy (DCPD-epoxy)/4,4'-diamino-diphenylmethane (DDM) network system. The thermal and dielectric properties of the cured DCPD-PPO/DCPD-epoxy system were compared with those of bisphenol A containing DCPD-PPO/BPA-epoxy or BPA-PPO/DCPD-epoxy systems. In addition to, a higher glass transition temperature and thermal stability, the cured DCPD-PPO/DCPD-epoxy resins exhibit lower dielectric constant, dissipation factor, coefficient of thermal expansion and moisture absorption than those of bisphenol A based redistributed-PPO/epoxy. (C) 2008 Elsevier Ltd. All rights reserved.
Keywords:dicyclopentadiene;dielectric constant;poly(phenylene oxide);redistribution;thermal properties