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首页> 外文期刊>ACS Omega >Multistimuli-Responsive Emulsifiers Based on Two-Way Amphiphilic Diblock Polymers
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Multistimuli-Responsive Emulsifiers Based on Two-Way Amphiphilic Diblock Polymers

机译：基于两性两亲性二嵌段聚合物的多刺激响应型乳化剂

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Diblock copolymers of poly(tert-butyl methacrylate) (PtBuMA) and poly(2-dimethylaminoethyl methacrylate) (PDMAEMA) of four different block lengths were prepared by sequential two-step reversible addition–fragmentation chain transfer radical polymerization, followed by hydrolysis of the PtBuMA blocks to obtain poly(methacrylic acid)-b-PDMAEMA (PMAA-b-PDMAEMA). The effect of the PDMAEMA block length on the multistimuli-responsive amphiphilic features of both types of diblock copolymers was investigated as CO2-switchable emulsifiers for emulsification/demulsification of n-octane (an oil) in water in response to CO2/N2 bubbling. The amphiphilicity of PtBuMA-b-PDMAEMA was switched on, and the amphiphilicity of PMAA-b-PDMAEMA was switched off by CO2 bubbling at pH 12 and 25 °C to achieve emulsification/demulsification. A longer PDMAEMA block length in PMAA-b-PDMAEMA conferred more sensitive CO2-responsive amphiphilicity but reduced the extent of recovery of emulsification ability on N2 bubbling. This newly developed diblock copolymer system could potentially serve as a “multifunctional surfactant” for CO2-switchable emulsification/demulsification of oil-in-water and water-in-oil mixtures.
机译：聚四甲基丙烯酸叔丁酯（PtBuMA）和聚甲基丙烯酸2-二甲基氨基乙基酯（PDMAEMA）的二嵌段共聚物是通过连续的两步可逆加成-断裂链转移自由基聚合反应，然后水解得到的。 PtBuMA嵌段得到聚（甲基丙烯酸）-b-PDMAEMA（PMAA-b-PDMAEMA）。研究了PDMAEMA嵌段长度对两种类型的双嵌段共聚物的多刺激响应性两亲特性的影响，作为可CO2转换的乳化剂，用于水中正辛烷（一种油）的乳化/破乳，以响应CO2 / N2鼓泡。开启PtBuMA-b-PDMAEMA的两亲性，并通过在pH 12和25°C下鼓入CO2来关闭PMAA-b-PDMAEMA的两亲性，以实现乳化/乳化。 PMAA-b-PDMAEMA中较长的PDMAEMA嵌段长度赋予了更敏感的CO2响应两亲性，但降低了N2起泡时乳化能力的恢复程度。这种新开发的二嵌段共聚物体系可以潜在地用作“多功能表面活性剂”，用于水包油和油包水混合物的CO2可转换的乳化/乳化。

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