Modulation Mechanisms of Polymeric Emulsion Stability and Porous Material Architecture within Ultrasonic Fields

doi:10.6023/A17030100

Acta Chim. Sinica ›› 2017, Vol. 75 ›› Issue (9): 878-883.DOI: 10.6023/A17030100 Previous Articles Next Articles

Article

超声场中高分子乳液稳定性与多孔材料结构的调控机理研究

朱先念, 陈芳, 翟薇, 魏炳波

西北工业大学理学院西安 710129

投稿日期:2017-03-13 发布日期:2017-09-04
通讯作者: 翟薇 E-mail:zhaiwei322@nwpu.edu.cn
基金资助:
国家自然科学基金（Nos.51327901，51571164）、陕西省科技新星项目（No.2016KJXX-85）、陕西省自然科学基金面上项目（No.2016JM2023）以及陕西省科技统筹创新工程重点实验室资助项目.

Modulation Mechanisms of Polymeric Emulsion Stability and Porous Material Architecture within Ultrasonic Fields

Zhu Xiannian, Chen Fang, Zhai Wei, Wei Bingbo

School of Natural and Applied Sciences, Northwestern Polytechnical University, Xi'an 710129

Received:2017-03-13 Published:2017-09-04
Contact: 10.6023/A17030100 E-mail:zhaiwei322@nwpu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Nos. 51327901 and 51571164), Science and Technology New Star Project of Shaanxi Province (No. 2016KJXX-85), Surface of the Shaanxi Province Natural Science Fund Project (No. 2016JM2023), Shaanxi Provincial Key Laboratory of Science and Technology Innovation Project.

1. Modulation Mechanisms of Polymeric Emulsion Stability and Porous Material Architecture within Ultrasonic Fields.PDF(397KB)

Abstract

Ultrasonic emulsification has received great attention recently due to the great potential of tuning the emulsion droplets size compared to the traditional homogeneous mixing method. In this study, a series of polymeric emulsions were prepared by ultrasonic emulsification approaches. The relationships between ultrasonic power, emulsion destabilization mechanism and structure morphology of macroporous polymer material were studied. The water in toluene emulsion was prepared by mixing the polymer POSS-(PMMA)₈ toluene solution (10 mg·mL^-1) and water or Na₂CO₃ aqueous solution (0.1 mol·L^-1) through different ultrasonic powers. The volume ratio of water/toluene was remained as 50:50. The evolution of emulsion droplets diameter distribution over time was analyzed based on optical microscopy data. The initial droplets diameter increased with the increase of ultrasonic power, and all emulsion droplets diameter distributions followed the diauxie curve. By changing the ion concentration in aqueous solution, excellent monodisperse emulsions with droplets diameter around 10 microns were acquired. It was found out that flocculation degree of emulsions prepared with Na₂CO₃ aqueous solution was increased with increasing of ultrasonic power. The relationship between ultrasonic power and emulsion stability was clarified by fitting the emulsion droplets diameter variation as the function of time. When ultrasonic power was below 750 W, Ostwald ripening dominated the instability mechanism of emulsion. Once the ultrasonic power achieved to 1000 W, the instability mechanism of emulsion was attributed to Ostwald ripening and coalescence at the same time. The macroporous polymer materials with adjustable pore diameter were prepared by dipping the glass fiber into salt containing emulsions. In this approach, POSS-(PMMA)₈ not only acted as emulsifier during emulsion preparation, but also treated as the skeleton of porous materials. The droplet-size of emulsions was monitored by changing ultrasonic power, meanwhile the structure and morphology of porous materials could be controlled on the basis of emulsion template.

Key words: ultrasonic field, emulsification, polymeric emulsion, emulsion template, porous material

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Zhu Xiannian, Chen Fang, Zhai Wei, Wei Bingbo. Modulation Mechanisms of Polymeric Emulsion Stability and Porous Material Architecture within Ultrasonic Fields[J]. Acta Chim. Sinica, 2017, 75(9): 878-883.

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超声场中高分子乳液稳定性与多孔材料结构的调控机理研究

Modulation Mechanisms of Polymeric Emulsion Stability and Porous Material Architecture within Ultrasonic Fields

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