有机改性金红石型纳米TiO_2对聚乙醇酸抗光老化性能的研究  

Study on photo-oxidative resistance of polyglycolic acid modified with organic nano-rutile-TiO_2

作　　者：崔爱军[1] 辛健[1] 蔡煜明 薛士瀚 朱晨浩 韦梅俊 陈群[1] 

机构地区：[1]常州大学绿色催化材料与技术重点实验室江苏省先进催化与绿色制造协同创新中心,江苏常州213164

出　　处：《化工进展》2018年第1期195-200,共6页Chemical Industry and Engineering Progress

基　　金：江苏产学研前瞻项目(BY2014037-17)

摘　　要：用硅烷偶联剂(A-172)对金红石型纳米TiO_2进行有机表面改性,采用红外光谱(FTIR)、透射电镜(TEM)对改性结果进行了表征。红外光谱表明,A-172以化学键的方式结合在纳米TiO_2表面;透射电镜照片表明,改性后的纳米TiO_2表现出较强疏水性。将改性后的纳米TiO_2作为紫外线屏蔽剂添加到聚乙醇酸(PGA)中,分别制备了TiO_2质量分数为0.5%、1%、1.5%和2%的复合材料,并采用氙灯气候试验机对纯PGA和PGA/纳米TiO_2复合材料进行加速老化对比试验。实验结果表明,改性后的纳米TiO_2在PGA材料中具有良好的分散性,使PGA具有更宽的紫外吸收范围和更强的紫外吸收峰,其中,当添加质量分数为1.5%时改性效果最佳,经过800h加速老化后,复合材料黄色指数只增加4.1,拉伸强度和缺口冲击强度保持率为56.34%和65.15%,分别比纯PGA提高了42.29%和37.21%,重均分子量和数均分子量保持率也分别提高了33.64%和33.99%。The surface of nano-rutile-TiO2 was modified by silane coupling reagent A-172 and the TiO2 were characterized by FTIR and TEM techniques.According to the spectra of FTIR,it can be inferred that the A-172 was bound on the surface of nanosized TiO2.Transmission electron microscopy pictures showed that the hydrophobicity of nanosized TiO2 modified with A-172 was improved.The modified nano-TiO2（0.5%,1%,1.5% and 2%）was added to polyglycolic acid（PGA）as the ultraviolet ray shielding,and a series of PGA composites were prepared.The accelerated aging test of pure PGA and PGA/nano-TiO2 composites was carried out with laboratory xenon arc lamp.The results showed that the modified nano-TiO2 could be well dispersed in PGA so that the PGA had a wider UV absorption range and a stronger UV absorption peak.And the aging resistance of PGA was remarkably improved.The modification effect was optimum when the mass fraction of modified nano-TiO2 was 1.5%,and the yellowness index of modified PGA just increased 4.1.Tensile strength and notched impact strength retention rate were 56.34% and 65.15%,respectively,increased by 42.29% and 37.21%.And weight average molecular weight and number average molecular weight retention were also increased by 33.64% and 33.99%,respectively.

关 键 词：金红石型纳米TIO2 表面 聚乙醇酸 分散 加速老化 

分 类 号：TQ317.6[化学工程—高聚物工业]