(1. 华东理工大学 特种功能高分子材料及相关技术教育部重点实验室, 上海 200237;
2. 华东理工大学 材料科学与工程学院，上海 200237)
摘 要: 以甲基磺酸(MSA)作为溶剂，采用溶液共混法制备二氧化钛/聚亚苯基苯并二噁唑 (TiO2/PBO)纳米复合材料；研究超声功率和超声时间对纳米TiO2/MSA悬浮液分散性的影响；并通过傅立叶红外光谱(FTIR)、热重分析(TGA)、扫描电镜(SEM)和紫外吸收光谱(UV)方法表征复合材料的结构特性。结果表明：当超声功率为250 W和超声时间为15 min时，纳米粒子在MSA中的分散性最佳；在红外图谱中，当TiO2的质量分数达到5%时， TiO2/PBO纳米复合材料与纯PBO的红外光谱无明显差别，说明纳米TiO2和PBO基体是通过物理作用连接起来的；与纯PBO相比，复合材料具有更优异的耐热性能，表现为热分解温度从PBO的689 ℃依次增高到690 ℃(1% TiO2)、694 ℃(5% TiO2)和698 ℃(10% TiO2)。由于纳米TiO2优异的紫外屏蔽性能，复合材料的吸光度在200~400 nm波段显著增大，因此，复合材料的抗老化性能也得到了极大的提高。
关键字: 纳米二氧化钛；分散性；溶液共混；紫外线屏蔽
solution blending method
（1. Key Laboratory for Specially Functional Polymeric Materials and Related Technology, Ministry of Education,
East China University of Science and Technology, Shanghai 200237, China;
2. School of Materials Science and Engineering, East China University of Science and Technology,
Shanghai 200237, China）
Abstract:TiO2/PBO (poly-p-phenylene benzobiythiazole) nano-composites were prepared by solution blending in MSA solvent. The effects of the ultrasonic power and ultrasonic time on the dispersion of nano TiO2 in MSA were studied. The structure and properties of composites were characterized by FTIR, TGA, SEM and UV. The results show that when the suspension ultrasonic power is 250 W with ultrasonic time of 15 min, the dispersion of nanoparticles in MSA is optimal. In the FTIR spectra, nano-composites display no distinguishable difference from those of the polymer matrix at the nano TiO2 compositions up to 5% (mass fraction), which indicates that nano TiO2 and PBO matrix are connected by physical interaction. TiO2/PBO nano-composites possess a better thermal stability over PBO with a higher thermal degradation temperature (td), which increases from 689 ℃ for PBO to 690 ℃, 694 ℃ and 698 ℃ for TiO2/PBO with nano TiO2 compositions of 1%, 5% and 10%, respectively. The absorbance of composites increases significantly in 200−400 nm wave range due to the excellent ultraviolet shielding function of nano TiO2. Therefore, TiO2/PBO nano-composites exhibit a dramatic enhancement in anti-aging property.
Key words: nano TiO2; dispersion; solution blending; ultraviolet shielding
