Kinetics of Morphological Transition between Cylindrical and Spherical Micelles in a Mixture of Anionic-Neutral and Cationic-Neutral Block Copolymers Studied by Time-Resolved SAXS and USAXS

被引：29

作者：

Takahashi, Rintaro ^{[1
,2
,3
]}

Narayanan, Theyencheri ^{[1
]}

Yusa, Shin-ichi ^{[4
]}

Sato, Takahiro ^{[2
]}

机构：

[1] ESRF, 71 Ave Martyrs, F-38043 Grenoble, France

[2] Osaka Univ, Dept Macromol Sci, 1-1 Machikaneyama Cho, Toyonaka, Osaka 5600043, Japan

[3] Univ Kitakyushu, Dept Chem & Biochem, Wakamatsu Ku, 1-1 Hibikino, Kitakyushu, Fukuoka 8080135, Japan

[4] Univ Hyogo, Grad Sch Engn, Dept Appl Chem, 2167 Shosha, Himeji, Hyogo 6712280, Japan

来源：

MACROMOLECULES | 2018年 / 51卷 / 10期

关键词：

POLYION COMPLEX MICELLES; X-RAY-SCATTERING; POLYELECTROLYTE COMPLEXES; INTERPOLYELECTROLYTE COMPLEXES; SEGMENTS; PATHWAY; SYSTEMS;

D O I：

10.1021/acs.macromol.8b00101

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

This study is concerned with the morphological transition kinetics of polyelectrolyte complex micelles formed from an anionic neutral block copolymer and a cationic neutral block copolymer in aqueous NaCl solution. The transformation was induced by changing the mixing ratio of the anionic and cationic monomer units in the copolymers. The kinetics of the morphological transition was directly tracked by time-resolved (ultra) small-angle X-ray scattering coupled with rapid mixing of the block copolymer components by a stopped flow apparatus. The transformation from cylindrical to spherical micelles upon changing the mixing ratio of the copolymers was reversible, and the process occurred via the random scission of the cylindrical micelles along their contours. The reverse transition from spherical to cylindrical micelles was found to be a slow process with high activation energy.

引用

页码：3654 / 3662

页数：9

共 31 条

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