纳米二氧化钛对质子辐照下MQ增强硅橡胶热性能的影响

采用空间综合辐照模拟设备研究了纳米二氧化钛对100keV和150keV能量质子辐照下MQ增强加成型硅橡胶损伤及热性能的影响.试验结果表明,质子辐照后,未添加纳米粒子的硅橡胶表面颜色明显加深,同时出现不同程度的老化裂纹,裂纹数量随辐照能量和剂量的增加而增加;辐照后硅橡胶的质损率增加,耐热性能下降;辐照后硅橡胶在玻璃态和玻璃转变区的温度区间内收缩率降低,而在高弹态的温度区间内膨胀率增加.添加纳米二氧化钛的硅橡胶与未改性硅橡胶相比,经过相同能量、剂量的质子辐照后,表面颜色加深和表面裂纹损伤的程度减小;质损率增加、耐热性能下降以及收缩膨胀率变化的程度均降低,表现出明显的抗辐照性能.

Effect of Nano-titanium Dioxide on Thermal Performance of Silicone Rubber Reinforced by MQ Resin Under Proton Radiation

The effect of nano-titanium dioxide on thermal performance of silicone rubber reinforcea with MQ resin under the proton radiation with the energy of 100keV and 150keV by space combined radiation system was studied. The results showed that the color of surface of silicon rubber without adding nano-particle was deepened, the aging crackle was produced on the surface of rubber after irradiation and the quantity of the crackle increased with the increase of irradiation energy and dosage. The mass loss ratio of silicon rubber increased and thermal stability reduced after irradiation. The shrinkage of silicone rubber reduced in the temperature range of vitreous state and vitrification transition region and the expansivity of silicon rubber increased in the temperature range of high-elasticity state after proton radiation. Compared with silicone rubber without adding nano-titanium dioxide, the degree of color deepening, surface crackle damaging, mass loss ratio increasing, thermal performance reducing and ratio of shrinkage and expansivity changing of silicone rubber modified with nano-titanium dioxide reduced after the proton irradiation of the same energy and fluence, which showed obvious irradiation resistance performance.