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首页> 外文会议>Advances in Mechanical Behaviour, Plasticity and Damage: Proceedings of EUROMAT 2000 >A comparison of the Deformation and Fracture Mechanisms in Rubber Toughened Poly(methyl methacrylate) and in Poly(urethane) / Poly(methyl methacrylate) Interpenetrating Polymer Networks
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A comparison of the Deformation and Fracture Mechanisms in Rubber Toughened Poly(methyl methacrylate) and in Poly(urethane) / Poly(methyl methacrylate) Interpenetrating Polymer Networks

机译：橡胶增韧聚甲基丙烯酸甲酯和聚氨酯/聚甲基丙烯酸甲酯互穿聚合物网络中变形和断裂机理的比较

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摘要

The tensile and fracture properties of rubber toughened poly(methylmethacrylate) (rtPMMA) modified by spherical core-shell particles, and poly(urethane)/poly(methyl methacrylate) (PU/PMMA) interpenetrating polymer networks (IPN) are investigated at different strain rates. The deformation and fracture mechanisms are studied by transmission electron microscopy (TEM). The results of the tensile tests show that deformation in both rtPMMA and IPN involves cavitation. The amount of cavitation increases with the strain rate in both kinds of material. This leads to similar mechanical properties in each case, and shows that a spherical particle morphology is not prerequisite for cavitation. A phenomenological model of the micromechanisms of deformation in core-shell particle modified PMMA is proposed.
机译：研究了球形核-壳颗粒改性的橡胶增韧聚甲基丙烯酸甲酯（rtPMMA）和互穿聚合物网络（IPN）的聚氨酯/聚甲基丙烯酸甲酯（PU / PMMA）的拉伸和断裂性能。费率。通过透射电子显微镜（TEM）研究了变形和断裂机理。拉伸试验的结果表明，rtPMMA和IPN的变形都涉及气蚀现象。在两种材料中，空化量都随应变率而增加。在每种情况下，这都会导致相似的机械性能，并且表明球形颗粒的形态并不是空化的先决条件。建立了核壳颗粒改性PMMA变形微观机制的现象学模型。

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