原位分散紫外光固化SiO_2纳米复合材料的性质

紫外光固化技术是以紫外光为辐射光源使体系快速固化的技术 ,具有易散热、快速固化成型、百分之百转化率、固化材料质量高等诸多优点 ,可用来制备各种功能材料 1～ 3] .Adrian等4] 在紫外光可固化材料中利用分散法填充各种传统填料 ,提高了固化材料的力学性能 .本文将 Si O2 纳米粒子分散在环氧丙烯酸酯齐聚体等构成的紫外光可固化溶液中 ,制得了 Si O2纳米复合材料 .试验表明 :原位分散紫外光固化合成纳米复合材料具有快速固化、容易成型、基体可选等优点 ,所得 Si O2 纳米复合材料具有良好的力学和光学性能 .试剂与仪器 :双酚 A环氧…

Properties of Silica/polymer Nanocomposites Prepared via in situ Ultraviolet Curing in Dispersion

The silica/polymer nanocomposites were obtained via in situ ultraviolet light irra diation of the dispersion system containing epoxylacrylate, aminoacrylate, 1,6 hexanediol diacry late , sensitizer 1173 and 20 nm silica particles. The results showed that the hardness, tensile strength and modulus of the nanocomposites were increased with increasing silica content. The silica nanocomposite with 2 5%(wt) of silica had pencil hardness of grade 6, tensile strength of 50 MPa and modulus of 1640 MPa. The initial thermal decomposition temperature of the nanocomposite was increased considerably at <400 K and decreased at >600 K . The thermal decomposition loss was 83 4% at near 800 K. The nanocomposites showed a strong ultraviolet absorbency in region of 200~400 nm and the absorbency at 400~ 800 nm increased with increasing silica content. the transmittance at 400 nm was 25% and fluorescence at 700 nm was observed when the composite was excited with 365 nm wave.