(1. 華東理工大學(xué) 特種功能高分子材料及相關(guān)技術(shù)教育部重點(diǎn)實(shí)驗(yàn)室, 上海 200237;
2. 華東理工大學(xué) 材料科學(xué)與工程學(xué)院，上海 200237)
摘 要: 以甲基磺酸(MSA)作為溶劑，采用溶液共混法制備二氧化鈦/聚亞苯基苯并二噁唑 (TiO2/PBO)納米復(fù)合材料；研究超聲功率和超聲時(shí)間對(duì)納米TiO2/MSA懸浮液分散性的影響；并通過傅立葉紅外光譜(FTIR)、熱重分析(TGA)、掃描電鏡(SEM)和紫外吸收光譜(UV)方法表征復(fù)合材料的結(jié)構(gòu)特性。結(jié)果表明：當(dāng)超聲功率為250 W和超聲時(shí)間為15 min時(shí)，納米粒子在MSA中的分散性最佳；在紅外圖譜中，當(dāng)TiO2的質(zhì)量分?jǐn)?shù)達(dá)到5%時(shí)， TiO2/PBO納米復(fù)合材料與純PBO的紅外光譜無明顯差別，說明納米TiO2和PBO基體是通過物理作用連接起來的；與純PBO相比，復(fù)合材料具有更優(yōu)異的耐熱性能，表現(xiàn)為熱分解溫度從PBO的689 ℃依次增高到690 ℃(1% TiO2)、694 ℃(5% TiO2)和698 ℃(10% TiO2)。由于納米TiO2優(yōu)異的紫外屏蔽性能，復(fù)合材料的吸光度在200~400 nm波段顯著增大，因此，復(fù)合材料的抗老化性能也得到了極大的提高。
關(guān)鍵字: 納米二氧化鈦；分散性；溶液共混；紫外線屏蔽
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
