【摘要】 采用自制的特种炸药利用爆轰法合成粒径为50 nm的纳米CeO₂。将纳米CeO₂以一定比例与环氧树脂（EP）混合,采用浇铸的方法制备纳米CeO₂改性的EP薄膜。利用设计的紫外老化试验箱对制备的薄膜进行了21 d加速老化试验,对比测试纯EP和改性EP老化前后薄膜的质量和力学性能变化规律。结果表明:纳米CeO₂对紫外线表现出较强的屏蔽作用。当纳米CeO₂在EP中的质量分数为0.8%时,改性EP薄膜对波长为254 nm的紫外吸光度最大,EP薄膜的力学性能有所提高。相比纯EP薄膜,添加纳米CeO₂后在紫外线条件下的使用寿命增加62%,对抗拉强度的保持率提高35%。更多还原

【Abstract】 CeO₂ nanoparticles with size of 50 nm were produced by detonation method using self-made special explosive.In order to study shielding effect to the ultraviolet,nano CeO₂ and epoxy resin（EP） were mixed in a certain proportion to prepare a modified epoxy resin thin film by casting method.The prepared films were accelerated aging for 21 d in ultraviolet inside a home-made test chamber to compare with no aging case,attempting to obtain the improvement of performance and mechanical properties of modified epoxy resin film.The results show that the modified nano ceria-epoxy resin film has strong shielding effect to ultraviolet.The absorbance of modified epoxy resin film to 254 nm UV wavelength is maximum when the mass fraction of nano CeO₂ is 0.8%.Meanwhile,the mechanical property of the films has been improved.Compared with the pure epoxy resin,the service life of modified epoxy resin extends by 60%and the tensile strength retention rate increases by 35%.更多还原