合成纳米TiO2／不饱和聚酯树脂（TiO2／UPR）的研究

Study of Synthesizing the Nanometer TiO2/ Unsaturated Polyester Resin(Nano-TiO2/UPR)

摘要:

将纳米TiO2粉加入到不饱和聚酯中进行同时增韧增强改性时，发现用简支梁冲击强度表征纳米TiO2／UPR的韧性时，树脂有明显的脆韧转变现象，脆-韧转变点为TiO2含量是6％。纳米TiO2／UPR弯曲强度和冲击强度较UPR分别提高了55％和46％。利用扫描电子显微镜观测纳米TiO2/UPR的冲击断口形貌时，发现在脆-韧转变点左右的纳米TiO2／UPR的微观形态发生了从脆性断裂到韧性断裂的形貌特征。

Abstract:

Th e Nanometer TiO 2 powder was put into the unsaturated p olyester resin for the simultaneous mo dification of strength-ening and flexibilizing.The impact strength was used to characterize th e ductility of the nano-TiO 2/UPR.It was found that the resin had the apparent brittleness-ductility t ransition phenomenon,a nd the content of TiO 2 at the brittleness-ductility transition point,was 6wt%.The bending stre ngth and impact strength of the nano-TiO 2/UPR were increased by 55%and 46%respectively compared with those of UPR.The micro observation of the impact fracture i ndicaties that,the fracture pattern of the nano-TiO 2/UPR changes from typical brittleness to typical toughness fracture near th e critical point.