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Preparation,Structure,and Properties of Flexible Polyurethane Foams Filled with Fumed Silica

Preparation,Structure,and Properties of Flexible Polyurethane Foams Filled with Fumed Silica
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摘要 Flexible polyurethane （PU） foams with different load-ing mass fraction （0%-2.0%） of fumed silica were synthesized by free-rising foaming method. The addition of 1.4% fumed silica makes the cells diffuse more uniform in the PU foam and the temperature of degradation occurring with a maximum weight loss rate is about 7℃ higher than that of pure PU foam. Most signifi-cantly,the sound absorption peaks of the filled PU foams shift to the low frequency region （from 997 Hz to 711 Hz） with increasing fumed silica content （0%-2.0%）. The average sound absorption coefficients of filled PU foams increase except the content of 0.35% fumed silica. The experimental results show that flexible PU foams filled with fumed silica have excellent sound absorption characteristics in low-frequency regions. Flexible polyurethane （PU） foams with different load-ing mass fraction （0%-2.0%） of fumed silica were synthesized by free-rising foaming method. The addition of 1.4% fumed silica makes the cells diffuse more uniform in the PU foam and the temperature of degradation occurring with a maximum weight loss rate is about 7℃ higher than that of pure PU foam. Most signifi-cantly,the sound absorption peaks of the filled PU foams shift to the low frequency region （from 997 Hz to 711 Hz） with increasing fumed silica content （0%-2.0%）. The average sound absorption coefficients of filled PU foams increase except the content of 0.35% fumed silica. The experimental results show that flexible PU foams filled with fumed silica have excellent sound absorption characteristics in low-frequency regions.
作者 LIU Ting MAO Liangliang LIU Fuwei JIANG Wuzhou HE Zhaobo FANG Pengfei
机构地区 School of Physics and Technology
出处 《Wuhan University Journal of Natural Sciences》 CAS 2011年第1期29-32,共4页 武汉大学学报（自然科学英文版）
基金 Supported by National Science Fund for Talent Training in Basic Science ( J0830310) the Fundamental Research Funds for the Central Universities (017)
关键词 polyurethane foam fumed silica sound absorption coefficients sound absorption peak polyurethane foam fumed silica sound absorption coefficients sound absorption peak
分类号 O422.4 [理学—声学] TB324 [一般工业技术—材料科学与工程]
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参考文献12

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Wuhan University Journal of Natural Sciences
2011年 第1期

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