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首页> 外文期刊>Journal of Applied Polymer Science >Solution and Interfacial Behavior of Hydrophobically Modified Water-Soluble Block Copolymers of Acrylamide and N-Phenethylacrylamide
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Solution and Interfacial Behavior of Hydrophobically Modified Water-Soluble Block Copolymers of Acrylamide and N-Phenethylacrylamide

机译：丙烯酰胺和N-苯乙基丙烯酰胺的疏水改性水溶性嵌段共聚物的溶液和界面行为

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摘要

Hydrophobically modified water-soluble block copolymers were prepared y aqueous micellar copolymerization of acrylamide and small amounts(2 and 3mol %) of hydrophobe(N-phenethylacrylamide) that is characterized by a long spacer that places the aromatic ring far away form the backbone .with the objective of investigating the copolymers'rheological behavior and surface and interfacial activities under various conditions such as polymer concentration,shear rate,temperature,and salinity,As expected,the bolck copolymers exhibit improved thickening properties attributed intermolecular hydrophobic associations as the solution viscosity o the coplymers increases sharply with increasing polymer concentration.Additional evidence for intermlolecular association is provided by the effect of NaCl ,the presence of which substantially enhances the viscosity,An almost shear rate-independent viscosity (Newtonian plateau) is also exhibited at high shear rate and a typical non-Newtonian shear thinning behavior appears at low shear rates and high temperatures,Furthermore ,the block copolymers exhibit high air-liquid surface and liquid-liquik interfacial activities as the surface and interfacial tensions decrease with increasing polymer concentration ,indicating strong adsorption of the copolymer at the interface .The surface and interfacial tensions exhibited by the copoymers were found to be relatively insensitive to the concentration of salt(NaCl).
机译：疏水改性的水溶性嵌段共聚物是由丙烯酰胺与少量（2和3mol％）疏水物（N-苯乙基丙烯酰胺）的水性胶束共聚制备的，其特征是长间隔基使芳香环远离主链。为了研究共聚物在各种条件下（例如聚合物浓度，剪切速率，温度和盐度）的流变行为以及表面和界面活性，如所预期的那样，bolck共聚物表现出改善的增稠特性，归因于分子间的疏水缔合（溶液粘度或粘度）。随着聚合物浓度的增加，聚合物急剧增加。NaCl的作用提供了分子间缔合的其他证据，NaCl的存在大大提高了粘度。在高剪切速率下，还表现出几乎与剪切速率无关的粘度（牛顿平台）。典型的非牛顿剪切稀化在低剪切速率和高温下会表现出较高的性能，此外，随着表面浓度和界面张力随着聚合物浓度的增加而降低，嵌段共聚物表现出较高的气液表面和液-液界面活性，表明该共聚物在界面处的强吸附性。发现共聚体表现出的表面张力和界面张力对盐（NaCl）的浓度相对不敏感。

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