Synthesis of Latex Particles with a Complex Structure As an Emulsifier of Pickering High Internal Phase Emulsions

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• 作者：Yun Zhu ; Shengmiao Zhang ; Ye Hua ; Heng Zhang ; Jianding Chen
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：March 26, 2014
• 年：2014
• 卷：53
• 期：12
• 页码：4642-4649
• 全文大小：421K
• 年卷期：v.53,no.12(March 26, 2014)
• ISSN：1520-5045

文摘

A one-pot surfactant-free emulsion polymerization was described to produce uniform copolymer particles with core鈥搒hell structure, single-cavity structure, single-cavity with multiprotrusions in edge structure, or multiprotrusions structure. The structure of the copolymer particles was tailored by simply varying the cross-linker divinylbenzene (DVB) concentration in the emulsion. The formation of the nonspherical shape of the polymer particles was attributed to the presence of local cross-linking domains in the latex particles at low conversion and the phase separation between the hydrophilic polymer rich region and hydrophobic polymer rich region in further polymerization. With the copolymer particles as an emulsifier, Pickering high internal phase emulsions (HIPEs) having an internal phase fraction of 85 vol% were obtained. The use of nonspherical particles not only stabilizes the Pickering emulsions against coalescence but also enhances the roughness of the void wall in the emulsion-templated porous polymers and even endows the porous polymers with high adhesive superhydrophobicity. This provides a simple and new approach to the fabrication of superhydrophobic surfaces.