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采用乙烯基三叔丁基过氧硅烷偶联剂(AC-70)改性纳米二氧化钛(TiO2)粒子,在纳米TiO2粒子表面引入不饱和双键,然后通过溶液聚合在纳米粒子表面接枝聚丙烯腈(PAN),形成TiO2-g-PAN复合纳米粒子,探究了其最佳合成工艺,采用红外光谱和X射线光电子能谱对其进行了表征;并对改性前后的纳米TiO2粒子进行了亲水亲油性测试、接触角测试、扫描电子显微镜分析及紫外线吸收测试。结果表明,PAN成功接枝到纳米TiO2表面;TiO2-g-PAN复合纳米粒子的最佳合成工艺为:反应温度75℃,反应时间5h,纳米粒子和单体之比为1∶6,引发剂用量为1.0%;纳米TiO2经过改性后表面由亲水性变为亲油性,接触角增大,纳米粒子的团聚现象得到明显改善;纳米TiO2-g-PAN粒子具有优良的紫外线吸收性能。
Nano titanium dioxide (TiO2) particles were modified by vinyltri-t-butylperoxysilane coupling agent (AC-70), unsaturated double bonds were introduced onto the surface of the nano-TiO2 particles, and then the polypropylene Nitrile (PAN) to form TiO2-g-PAN composite nano-particles, to explore the best synthesis process, the use of infrared spectroscopy and X-ray photoelectron spectroscopy was characterized; and before and after modification of the nano-TiO2 particles were pro Water-lipophilic test, contact angle test, scanning electron microscope analysis and UV absorption test. The results showed that PAN was successfully grafted to the surface of nano-TiO2. The optimum synthesis conditions of the nano-particles of TiO2-g-PAN were reaction temperature 75 ℃, reaction time 5h, ratio of nanoparticles to monomer 1: 6, initiator The amount of nano-TiO2 was 1.0%. The surface of nano-TiO2 was changed from hydrophilic to lipophilic and the contact angle increased, the agglomeration of nano-particles was obviously improved. The nano-TiO2-g-PAN particles had excellent UV absorption.