Synthesis of nano-sized TiO₂/poly(AA-co-MMA) composites by heterocoagulation and blending with PET

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• 作者：Jui-Hung Chen ; Chi-An Dai ; Hung-Jen Chen ; Pei-Chi Chien ; Wen-Yen Chiu
• 关键词：TiO₂ ; SiO₂ ; Poly(AA-co-MMA) ; Composite latexes ; PET blends
• 刊名：Journal of Colloid and Interface Science
• 出版年：2007
• 期刊代码：125_00219797
• 类别：ch
• 出版时间：1 April 2007
• 卷：308
• 期：1
• 页码：81-92
• 文件大小：1302 K

摘要

Nano-sized TiO₂ or SiO₂/TiO₂ particles were prepared by hydrolysis and condensation reactions in aqueous media, followed by mixing with poly(AA-co-MMA) latex to form different composites, then blending with poly(ethylene terephthalate), PET. The TGA results of composites indicated that negative charged latexes had greater interaction with TiO₂/ or SiO₂/TiO₂ particles through strong electrostatic forces, while cationic latexes incorporated with TiO₂ or SiO₂/TiO₂ particles by pH induced coagulation, carbonyl group chelation and hydrogen bonding. The soapless latex polymer particles showed lower ability of adsorption to TiO₂ particles due to the decrease of total surface area of these larger particles. If SiO₂/TiO₂ particles were used instead of TiO₂ particles, unexpected high adsorption result was observed. Morphology results observed by SEM showed that PET blended with positive charged composites was more homogeneous than PET blended with negative charged composites. DSC results also indicated that the T_g of PET was increased, melting temperatures (T_m or ) were increased, and the temperature range of crystallization was narrowed after blending with the composites. The presence of composites affected the mobility and packing of PET molecular chains therefore changing the thermal properties of PET.