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1,2-Bis(vinylphenyl)ethane (BVPE) could be cured without curing agents at relatively low temperatures (ϳ 180°) in a nitrogen atmosphere. Cured BVPE (CBVPE) resin showed exceptionally low dielectric constant (⑀ ϭ 2.50 at 10 GHz) and low dielectric loss tangent (tan ␦ ϭ 0.0012 at 10 GHz), and had excellent thermal resistance. Its 5 wt % weight-loss temperature was 425°C in a nitrogen atmosphere and glass transition temperature was over 400°C. Poly(phenylene oxide) (PPO) was used to improve the toughness of CBVPE resin. PPO was an effective modifier to toughen CBVPE resin: when using 30 wt % of the modifier, the tensile strength and elongation of the modified CBVPE resin were 75 MPa and 26%, respectively. The modified CBVPE resin also showed excellent dielectric properties (⑀ ϭ 2.45 at 10 GHz, tan ␦ ϭ 0.0015 at 10 GHz).

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