【摘 要】
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The CaSO4 whisker/polyurethane elastomer composites with high strength and high toughness are fabricated.The CaSO4 whisker reinforcing and toughening mechanisms
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The CaSO4 whisker/polyurethane elastomer composites with high strength and high toughness are fabricated.The CaSO4 whisker reinforcing and toughening mechanisms for polyurethane elastomer are studied.The observation of the fracture surface by SEM and TEM shows that CaSO4 whisker reinforcing mechanism for polyurethane elastomer is mainly load transfering,while its toughening mechanism involves crack deflection and whisker pullout.The effects of dispersity of CaSO4 whisker and the interfacial bonding state on reinforcement and toughness are discussed.The results indicate that composites with 5%～10% CaSO4 whisker exhibit the best mechanical properties among the materials tested.Good bonding interface is formed between whisker and matrix after the surface of CaSO4 whisker being treated by silane coupling agent(KH-550).Better interfacial bonding state contributes to strength and toughness being fairly improved.
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