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Cyclic Compression of Rigid PU/ER Interpenetrating Polymer Networks Foams
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HUA Xingyan1,ZHAO Peizhong2,ZHU Jinhua3,WANG Yuansheng3
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(1. Branch 94, The People’s Liberation Army Unit 91550，Dalian 116023, Liaoning, China; 2. Qingdao Branch, Naval Academy of Aeronautical Engineering, Qingdao 266041, Shandong, China; 3. College of Science, Naval University of Engineering, Wuhan 430033, Hubei, China)
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Abstract A series of rigid polyurethane (PU)/epoxy resin (ER) IPN foams were prepared. Changes of the chemical structure and morphology of IPN foams were investigated by FTIR spectroscopy and SEM. The FTIR show that there exist some chemical bonds between PU and ER component. The cell shapes of all the IPN foams are almost uniform. The cyclic compression behaviors of the IPN foams were tested. The results indicate that the stress at any given strain and the dissipated energy both decrease with the number of cycles. The stress and dissipated energy both increase with the ER content. The loading and unloading response can be fully described by modified Ogden’s model. The accumulated dissipated energy can be expressed by Weibull equation.
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Received: 31 August 2009
Published: 30 November 2010
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