Polystyrene(PS)/polyphenyl ether(PPO)blends were prepared by melt blending method.By controlling the processing temperature,PPO exists in the blend in the form of rigid particles,forming a stable"island"structure.By us-ing supercritical carbon dioxide as blowing agent,the PS open cell foam with high porosity was obtained.The effect of PPO contents on the rheological properties and thermodynamic behavior of PS,and the effect of stable"island"structure on the formation of PS/PPO foam were studied.The cell size,foaming rate,opening rate and foam compression proper ties of PS/PPO foam products were analyzed.The results showed that when the foaming temperature was 158 ℃,the pressure was 20 MPa and the PPO content was 10％,the PS open-cell foam with foaming ratio of 37.5 times and open-ing ratio of 96.9％could be prepared.
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