硼化端羟基聚硅氧烷(PBDMS)是一种具有剪切增稠特性的抗冲击智能材料,抗冲击智能材料在低应变速率下呈流动态,当受到冲击时材料会表现出固体状态从而消耗大量能量,因此材料具备抗冲击性能。采用SiO2颗粒填充PBDMS制备PBDMS-SiO2复合材料,用其改性硅胶得到PBDMS改性双组分硅胶。研究了改性前后硅胶的动态抗冲击性能及SiO2含量对材料性能影响。动态热机械分析结果表明,随着SiO2含量的增加,改性双组分硅胶的吸能减震效果及弹性变强。通过Hopkinson压杆实验测试材料在不同应变速率下的真实应力/应变,结果表明PBDMS改性双组分硅胶抗冲击性能增强且在较高应变速率下具有更高的强度。激光扫描共聚焦显微镜分析表明,PBDMS-SiO2以粒子形式存在于改性硅胶当中。PBDMS可以提高双组分硅胶的抗冲击性能,SiO2可以提高改性双组分硅胶的弹性及缓冲减震效果。
Hydroxyl terminated polysiloxane (PBDMS) is a kind of anti-impact smart material with shear thickening behavior.In normal state,it is dynamic;when impacted,the material becomes solid state and consumes much energy.This property makes PBDMS become a good impact resistance material.The modification of two component silica gel was mainly described by adding PBDMS with different proportion of silica particles in it.The relationship between dynamic impact resistance of modified silica gel and the blend volume of silica particles in it was analyzed.Dynamic mechanical analysis (DMA) shown that with the increase of silica particles,the energy absorption effect and elasticity of silica gel became stronger.The real stress-strain relationships under dynamic compression were obtained by modified Hopkinson bar testing.The strength of silica gel increased with increasing strain rate,which implied a higher impact resistance of the silica gel with the addition of PBDMS-SiO2 at higher loading rate.The results of laser scanning confocal microscopy showed that PBDMS-SiO2 existed in the modified silica gel as particles.PBDMS can improve the impact resistance of the two-component silica gel,and SiO2 can improve the elasticity and cushioning effect of the modified two-component silica gel.
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基金资助
国家自然科学基金资助项目(51202189);陕西省自然科学基金(2011JQ6005);陕西省教育厅科技研究计划(11JK0825)
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