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Use of a CO2-Switchable Hydrophobic Associating Polymer to Enhance Viscosity-Response

机译:可利用CO2转换的疏水缔合聚合物增强粘度响应

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摘要

A series of copolymers, poly(acrylamide)-co-poly(N, N-dimethylaminoethyl methacrylate)-co-poly(N-cetyl DMAEMA) (abbreviation PDAMCn), was synthesized with different monomer ratios. The resulting copolymer solution shows pronounced viscosity-response property which is CO2-triggered and N-2-enabled. Electrical conductivity experiment shows that tertiary amine group on DMAEMA experiences a protonate and deprotonate transition upon CO2 addition and its removal. In addition, different incorporation rates of DMAEMA leads to two kinds of morphological change in the presence of CO2 and thus induces different rheological behaviors. PDAMCn incorporating longer hydrophobic monomer (C18DM) show more pronounced initial viscosity and higher critical stress required to cause network deformation, which consequently enhances the viscosity-response property of the solution. The addition of NaCl could also tune the viscosity of PDAMCn solution. (C) 2014 Wiley Periodicals, Inc.
机译:合成了具有不同单体比例的一系列共聚物,即聚(丙烯酰胺)-共-聚(N,N-二甲基氨基乙基甲基丙烯酸酯)-共-聚(N-鲸蜡基DMAEMA)(简称PDAMCn)。所得的共聚物溶液显示出显着的粘度响应特性,该特性是CO 2激发的和N 2-活化的。电导率实验表明,DMAEMA上的叔胺基团在添加和去除CO2后经历了质子化和去质子化的转变。另外,在存在二氧化碳的情况下,不同的DMAEMA掺入率会导致两种形态变化,从而引起不同的流变行为。掺入更长疏水性单体(C18DM)的PDAMCn显示出更明显的初始粘度和引起网络变形所需的更高的临界应力,因此增强了溶液的粘度响应特性。 NaCl的添加还可以调节PDAMCn溶液的粘度。 (C)2014威利期刊公司

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