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| Synthesis and Characterization of Polyfunctional Aziridine/Polyester Microcapsules by W/O/W Multiple Emulsion–solvent Evaporation |
| HU Jianqing, ZHENG Zhixian, ZHU Haijun, TU Weiping, WANG Feng |
| School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640 |
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Cite this article:
HU Jianqing ZHENG Zhixian ZHU Haijun TU Weiping WANG Feng. Synthesis and Characterization of Polyfunctional Aziridine/Polyester Microcapsules by W/O/W Multiple Emulsion–solvent Evaporation. Chin J Mater Res, 2010, 24(6): 619-624.
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Abstract A novel multiple emulsion–solvent evaporation method was successfully adopted to prepare polyfunctional aziridine/polyester cross linking microcapsules, during which various synthesis process parameters were discussed in detail. It was found that too fast a solvent evaporation rate would result in shrink porous microcapsules, and even hardening rate for microcapsule shell could be achieved with solvent evaporating in ca. 2 hours. Polyester with lower surface free energy was found to be beneficial for capsulation, and fully capsulated microcapsules were synthesized at 34.5 mJ/m2. Adding 2.5% of colloid stabiliser could result in even–structured microcapsules with hollow structure. Well–defined microcapsules with even shell thickness were obtained at 50%:50% of shell/ core mass ratio, with a core content of 22%, indicating that morphology and core content of microcapsule strongly depend on shell/ core mass ratio. SEM and FTIR were used to determine morphology and chemical constitution of microcapsules. Hollow–structured microcapsules with even shell thickness could be clearly observed. XAMA–7 core were well capsulated at the centre of microcapsules.
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Received: 15 April 2010
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| Fund: Supported by National Natural Science Foundation of China No. 50903031 and the Fundamental Research Funds for the Central Universities No.2009ZM0046. |
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