Mechanism of Molecular Exchange in Diblock Copolymer Micelles: Hypersensitivity to Core Chain Length

被引：178

作者：

Choi, Soo-Hyung ^{[1
]}

Lodge, Timothy P. ^{[1
,2
]}

Bates, Frank S. ^{[1
]}

机构：

[1] Univ Minnesota, Dept Chem Engn & Mat Sci, Minneapolis, MN 55455 USA

[2] Univ Minnesota, Dept Chem, Minneapolis, MN 55455 USA

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 104卷 / 04期

基金：

美国国家科学基金会;

关键词：

BLOCK-COPOLYMER; ENERGY-TRANSFER; SELF-DIFFUSION; KINETICS; MICELLIZATION; RELAXATION; SPHERE;

D O I：

10.1103/PhysRevLett.104.047802

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Molecular exchange between spherical micelles formed from isotopically labeled diblock copolymers was investigated using time-resolved small-angle neutron scattering measurements. Temperature changes affect the micelle exchange rate R(t) consistent with melt dynamics for the core polymer. Varying the core block length N produces gigantic changes in R(t) due to the thermodynamic penalty associated with ejecting a core block into the surrounding solvent. This hypersensitivity, combined with modest polydispersity in N, leads to an approximately logarithmic R(t).

引用

页数：4

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