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Tuning CO2-induced reversible redispersion or irreversible destabilisation for latex separation.
Journal of Colloid and Interface Science ( IF 9.4 ) Pub Date : 2020-04-02 , DOI: 10.1016/j.jcis.2020.03.121 Meng Mu 1 , Rui Yuan 2 , Ganghong Zhang 2 , Dianguo Wu 2 , Hongping Quan 3 , Peihui Han 4 , Yujun Feng 1
Journal of Colloid and Interface Science ( IF 9.4 ) Pub Date : 2020-04-02 , DOI: 10.1016/j.jcis.2020.03.121 Meng Mu 1 , Rui Yuan 2 , Ganghong Zhang 2 , Dianguo Wu 2 , Hongping Quan 3 , Peihui Han 4 , Yujun Feng 1
Affiliation
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HYPOTHESIS
The CO2-sensitive dispersion/precipitation transition of polymer latexes fabricated based on a responsive emulsifier is a promising way to conveniently acquire bulk polymer materials. Nevertheless, the tedious synthesis procedures for switchable surfactants and the harsh operating requirements for the sensitive latexes constrain the applicability of the approach for latex preparation. Therefore, a new strategy for generating latexes with tunable CO2 responsiveness in a maneuverable way is urgently needed.
EXPERIMENTS
In this work, a CO2-switchable electrostatic interaction is introduced to construct responsive latexes. A series of lightly crosslinked poly(diethylaminoethyl methacrylate-styrene) [P(DEA-St)] latexes with different PDEA contents were fabricated via one-pot emulsion copolymerization, with divinylbenzene and sodium dodecylsulfate (SDS) used as the crosslinker and anionic emulsifier, respectively. The influence of the DEA feeding ratio on the resulting P(DEA-St) colloids was characterized by Fourier transform infrared spectroscopy and scanning electron microscopy. Then, a cyclic CO2/N2 input was introduced to verify the response transitions of polymer latexes.
FINDINGS
Accompanied by the stepwise decrease of DEA feeding ratio, the morphology of the resulting copolymerized nanoparticles changed from an ambiguous bulge to the typical spherical pattern. In addition, the P(DEA-St) latexes treated by cyclic CO2/N2 exhibit four different types of response modes, namely (i) CO2-switchable swelling/deswelling transition, (ii) CO2-reversible dispersion/coagulation transition, (iii) CO2-induced irreversible destabilisation and (iv) CO2-insensitive latexes. The CO2-responsive destabilisation is highly applicable in the separation and transportation fields of commercial latex products, such as poly(methyl methacrylate), poly(n-butyl acrylate) and poly(butyl methacrylate) colloids.
中文翻译：
调整CO2引起的可逆分散或不可逆去稳定，以进行胶乳分离。
假设基于反应性乳化剂制备的聚合物胶乳对CO2敏感的分散/沉淀转变是一种方便的方法，可以方便地获得大块的聚合物材料。然而，可转换表面活性剂的繁琐合成程序和对敏感乳胶的苛刻操作要求限制了该乳胶制备方法的适用性。因此，迫切需要一种以可操纵的方式产生具有可调的CO 2响应性的胶乳的新策略。实验在这项工作中，引入了一种可通过CO2转换的静电相互作用来构建响应性胶乳。通过一锅式乳液共聚制备了一系列不同交联的PDEA含量的轻度交联的聚甲基丙烯酸二乙氨基乙酯-苯乙烯[P（DEA-St）]乳胶，二乙烯基苯和十二烷基硫酸钠（SDS）分别用作交联剂和阴离子乳化剂。通过傅里叶变换红外光谱和扫描电子显微镜表征了DEA进料比对所得P（DEA-St）胶体的影响。然后，引入环状CO2 / N2输入以验证聚合物胶乳的响应转变。发现伴随着DEA进料比的逐步降低，所得共聚的纳米颗粒的形态从不规则的凸起变为典型的球形。此外，经环状CO2 / N2处理的P（DEA-St）胶乳表现出四种不同类型的响应模式，即（i）可CO2转换的溶胀/溶胀转变，（ii）可CO2可逆的分散/凝固转变，（iii）CO2引起的不可逆去稳定作用和（iv）CO2不敏感的胶乳。CO 2响应性去稳定作用非常适用于商业胶乳产品的分离和运输领域，例如聚甲基丙烯酸甲酯，聚丙烯酸正丁酯和聚甲基丙烯酸丁酯胶体。
更新日期：2020-04-03
中文翻译：
调整CO2引起的可逆分散或不可逆去稳定，以进行胶乳分离。
假设基于反应性乳化剂制备的聚合物胶乳对CO2敏感的分散/沉淀转变是一种方便的方法，可以方便地获得大块的聚合物材料。然而，可转换表面活性剂的繁琐合成程序和对敏感乳胶的苛刻操作要求限制了该乳胶制备方法的适用性。因此，迫切需要一种以可操纵的方式产生具有可调的CO 2响应性的胶乳的新策略。实验在这项工作中，引入了一种可通过CO2转换的静电相互作用来构建响应性胶乳。通过一锅式乳液共聚制备了一系列不同交联的PDEA含量的轻度交联的聚甲基丙烯酸二乙氨基乙酯-苯乙烯[P（DEA-St）]乳胶，二乙烯基苯和十二烷基硫酸钠（SDS）分别用作交联剂和阴离子乳化剂。通过傅里叶变换红外光谱和扫描电子显微镜表征了DEA进料比对所得P（DEA-St）胶体的影响。然后，引入环状CO2 / N2输入以验证聚合物胶乳的响应转变。发现伴随着DEA进料比的逐步降低，所得共聚的纳米颗粒的形态从不规则的凸起变为典型的球形。此外，经环状CO2 / N2处理的P（DEA-St）胶乳表现出四种不同类型的响应模式，即（i）可CO2转换的溶胀/溶胀转变，（ii）可CO2可逆的分散/凝固转变，（iii）CO2引起的不可逆去稳定作用和（iv）CO2不敏感的胶乳。CO 2响应性去稳定作用非常适用于商业胶乳产品的分离和运输领域，例如聚甲基丙烯酸甲酯，聚丙烯酸正丁酯和聚甲基丙烯酸丁酯胶体。
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