Masaki Kinoshita, Daisuke Kugimoto, Kosuke Morimoto, Kazuyuki Ito, Kengo Tsuboi, S. Kanazawa, I. Akiba
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引用次数: 0
摘要
用异常小角X射线散射(ASAXS)研究了pH触发的聚甲基丙烯酸-嵌段-聚2 -溴甲基丙烯酸甲酯(PMAA - b prema)聚合物胶束结构变化。ASAXS显示，当pH值从4.8增加到12.5时，PMAA - b - prema胶束的聚集数量和疏水核的大小急剧减少。在碱性条件下，PMAA - b - prema胶束尺寸的急剧减小是由于胶束电晕层中阴离子PAA链之间的静电斥力减小所致。
Study on the Anomalous Small-Angle X-Ray Scattering on Structural Change in pH-Responsive Polymer Micelles
pH - triggered structural change of polymer micelles composed of poly ( methacrylic acid )- block - poly ( 2 - bromethyl methacrylate ) ( PMAA - b PBrEMA ) was investigated with anomalous small - angle X - ray scattering ( ASAXS ) near the Br K edge. ASAXS revealed that the size of the hydrophobic core and the aggregation number of PMAA - b - PBrEMA micelles drastically decreased with an increase in the pH from 4.8 to 12.5. It was concluded that the drastic reduction of the size of PMAA - b - PBrEMA micelles in alkaline conditions was caused by the reduced electrostatic repulsion between anionic PAA chains in the corona layer of the micelles.
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