文献类型：期刊文献

英文题名：Pickering Emulsions Stabilized by Diblock Copolymer Worms Prepared via Reversible Addition-Fragmentation Chain Transfer Aqueous Dispersion Polymerization: How Does the Stimulus Sensitivity Affect the Rate of Demulsification?

作者：Gao, Yong[3];Xiang, Zhe[1,2];Zhao, Xi[3,4];Wang, Guoxiang[4];Qi, Chenze[3]

机构：[1]Xiangtan Univ, Key Lab Adv Funct Polymer Mat Coll Hunan Prov, Key Lab Polymer Mat & Applicat Technol Hunan Prov, Minist Educ,Coll Chem, Xiangtan 411105, Hunan, Peoples R China;[2]Xiangtan Univ, Key Lab Adv Funct Polymer Mat Coll Hunan Prov, Key Lab Polymer Mat & Applicat Technol Hunan Prov, Minist Educ,Key Lab Environm Friendly Chem & Appl, Xiangtan 411105, Hunan, Peoples R China;[3]Shaoxing Univ, Coll Chem & Chem Engn, Key Lab Alternat Technol Fine Chem Proc Zhejiang, Shaoxing 312000, Zhejiang, Peoples R China;[4]Hunan Inst Sci & Technol, Coll Chem & Chem Engn, Yueyang 414006, Hunan, Peoples R China

年份：2021

卷号：37

期号：40

起止页码：11695

外文期刊名：LANGMUIR

收录：SCI-EXPANDED(收录号：WOS:000708699800005)、、WOS

基金：The authors gratefully acknowledge financial supports from the National Natural Science Foundation of China (21971220, 21574112, and 12075154)

语种：英文

外文关键词：Acrylic monomers - Amides - Demulsification - Emulsification - Ethylene glycol - Ostwald ripening - Polymerization - Synthesis (chemical)

外文摘要：Responsive Pickering emulsions exhibit promising application in industry owing to the integration of the high storage stability with on-demand demulsification. In this study, stimuli- responsive Pickering emulsions stabilized by poly[oligo(ethylene glycol) methyl ether methacrylate](15)-b-poly(diacetone acrylamide)(120) (E15D120) worms were indicated, in which E15D120 worms were prepared via reversible addition-fragmentation chain transfer-based aqueous dispersion polymerization using thermo-sensitive POEGMA(15) as both the stabilizer block and macro-chain transfer agent. The factors influencing the morphologies of copolymers during polymerization-induced self assembly have been investigated. A series of different morphological polymer nanoparticles including spheres, worms, and vesicles could be produced through rational synthesis. E15D120 worms demonstrated excellent emulsifying performances and could be used as emulsifiers to form n-dodecane-in-water Pickering emulsions at a low content. The formed n-dodecane-in-water Pickering emulsions revealed a slow demulsification at pH 10 or 70 degrees C or pH 10/70 degrees C combinations, and several hours were needed for the demulsification of Pickering emulsions. However, n-dodecane-in-water Pickering emulsions displayed a rapid demulsification (similar to 10 min) at an elevated temperature, such as 90 degrees C. The different demulsification rates were attributed to different sensitivities of E15D120 worms to external stimuli. Pickering emulsions integrating a rapid responsive demulsification with a slow one would be well satisfactory on different occasions.