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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Self-consistent-field analysis of the micellization of carboxy-modified poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) triblock copolymers
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Self-consistent-field analysis of the micellization of carboxy-modified poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) triblock copolymers

机译：羧基改性聚环氧乙烷-聚环氧丙烷-聚环氧乙烷三嵌段共聚物胶束化的自洽场分析

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摘要

The micellization properties of carboxy-modified Pluronics P85 (poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (PEO-PPO-PEO) triblock copolymers) are investigated by means of a molecularly realistic self-consistent-field theory. We consider the, so-called, carboxylic acid end-standing P85 (CAE-85) case where the carboxylic group is located at the end of both PEO parts and the carboxylic acid centerstanding P85 (CAC-85) case where each of the carboxylic group presents between the PEO and PPO blocks. The micellization of these copolymers depends on the pH, the added electrolyte concentration phi(s), and the temperature. It is shown that the aggregation number (N-agg) decreases, whereas the critical micellization concentration (CMC) increases with pH. For the case of increasing phi(s), the Nagg increases and the CMC decreases. The critical micellization temperature (CMT) and cloud point temperature (CPT) increase with pH at low phi(s) and decrease at increasing phi(s). The changing from CAE-85 to CAC-85 leads to increasing CMC and CMT, but lower CPT.
机译：通过分子现实的自洽场研究了羧基改性Pluronics P85（聚环氧乙烷-聚环氧丙烷-聚环氧乙烷（PEO-PPO-PEO）三嵌段共聚物）的胶束化性质理论。我们考虑所谓的羧酸端基P85（CAE-85）情况，其中羧基位于两个PEO部分的末端，而羧酸中心酸P85（CAC-85）情况，其中每个羧基组出现在PEO和PPO块之间。这些共聚物的胶束化作用取决于pH，添加的电解质浓度phi和温度。结果表明，聚集数（N-agg）降低，而临界胶束浓度（CMC）随pH值增加。对于phi增大的情况，Nag增大而CMC减小。临界胶束化温度（CMT）和浊点温度（CPT）在低phi下随pH升高而在phi升高时降低。从CAE-85变为CAC-85导致CMC和CMT增加，但CPT降低。

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