An Investigation on the Formation Mechanisms and Preparation of Monodispersed Urea-formaldehyde (UF) Polymer/SiO2 Composite Microspheres

Acta Chimica Sinica ›› 2004, Vol. 62 ›› Issue (5): 493-497. Previous Articles Next Articles

单分散脲醛/SiO₂复合微球的制备及其形成机理研究

郭瑞, 余家国, 赵丽, 赵修建

武汉理工大学材料复合新技术国家重点实验室, 武汉, 430070

投稿日期:2003-08-14 修回日期:2003-11-14 发布日期:2014-02-18
通讯作者: 余家国,E-mail:yujiaguo@public.wh.hb.cn E-mail:yujiaguo@public.wh.hb.cn
基金资助:
国家自然科学基金(No.50272049),教育部优秀青年教师资助计划和教育部出国留学回国人员科研基金资助项目.

An Investigation on the Formation Mechanisms and Preparation of Monodispersed Urea-formaldehyde (UF) Polymer/SiO₂ Composite Microspheres

GUO Rui, YU Jia-Guo, ZHAO Li, ZHAO Xiu-Jian

State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070

Received:2003-08-14 Revised:2003-11-14 Published:2014-02-18

Abstract

The urea-formaldehyde (UF) polymer/SiO₂ composite microspheres were prepared by polymerization- induced colloid aggregation (PICA) method. In this method, an aqueous silica colloid solution containing sol particles with mean diameter of 12 nm is mixed with urea and formaldehyde, then urea and formaldehyde polymerize in an acidic sol solution inducing the colloids to aggregate. The effects of formaldehyde/urea molar ratio (R), pH value and volume fraction of ethanol (V_e) on the resulting microspheres have been investigated with scanning electron microscopy (SEM) and optical microscope. The results show that monodispersed UF/SiO₂ composite microspheres with a mean diameter of about 4 μm can be repeatedly obtained under the optimum conditions, which include the pH value of 0.3～0.8, the R range from 1 to 4 and the V_e of 10%～30%. The formation mechanism of composite microspheres is attributed to the fact that the urea and formaldehyde firstly undergo acid-catalyzed polymerization to form oligomers, and then the sol particles are adsorbed on the chain of oligomers by van der Waals force and hydrogen bonding. When the oligomers reach the critical chain length, they separate from solution due to phase separation. Polymer-based UF/SiO₂ composite microspheres are obtained in the solution.

Key words: PICA, urea, formaldehyde, SiO₂ sol, composite microsphere, phase separation

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GUO Rui, YU Jia-Guo, ZHAO Li, ZHAO Xiu-Jian. An Investigation on the Formation Mechanisms and Preparation of Monodispersed Urea-formaldehyde (UF) Polymer/SiO₂ Composite Microspheres[J]. Acta Chimica Sinica, 2004, 62(5): 493-497.

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单分散脲醛/SiO₂复合微球的制备及其形成机理研究

An Investigation on the Formation Mechanisms and Preparation of Monodispersed Urea-formaldehyde (UF) Polymer/SiO₂ Composite Microspheres

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单分散脲醛/SiO2复合微球的制备及其形成机理研究