Redox Responsive Behavior of Thiol/Disulfide-Functionalized Star Polymers Synthesized via Atom Transfer Radical Polymerization

被引：144

作者：

Kamada, Jun ^{[1
,2
]}

Koynov, Kaloian ^{[3
]}

Corten, Cathrin ^{[4
]}

Juhari, Azhar ^{[3
]}

Yoon, Jeong Ae ^{[1
]}

Urban, Marek W. ^{[4
]}

Balazs, Anna C. ^{[5
]}

Matyjaszewski, Krzysztof ^{[1
]}

机构：

[1] Carnegie Mellon Univ, Dept Chem, Pittsburgh, PA 15213 USA

[2] Mitsui Chem Inc, Mat Sci Lab, Chiba 2990265, Japan

[3] Max Planck Inst Polymer Res, D-55128 Mainz, Germany

[4] Univ So Mississippi, Shelby F Thames Polymer Sci Res Ctr, Sch Polymers & High Performance Mat, Hattiesburg, MS 39406 USA

[5] Univ Pittsburgh, Dept Chem Engn, Pittsburgh, PA 15213 USA

来源：

MACROMOLECULES | 2010年 / 43卷 / 09期

基金：

美国国家科学基金会;

关键词：

SHAPED POLYMERS; MULTIFUNCTIONAL INITIATORS; METHYL-METHACRYLATE; BLOCK-COPOLYMERS; SOFT ELASTOMERS; GENERAL-METHOD; DRUG-DELIVERY; CORE; ATRP; DISULFIDES;

D O I：

10.1021/ma100365n

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

A poly(n-butyl acrylate)-based star polymer, polyEGDA-(polyBA)(n), was synthesized by atom transfer radical polymerization using a modified core-first method. Further polymerization of a disulfide (SS) cross-linking :went bis(2-methacryloyloxyethyl) disulfide from the arm end produced a SS cross-linked star polymer. The disulfide functionality could be cleaved via reducing reactions, generating individual stars containing SH groups at the chain ends. The transformation between SS cross-linked star and SH-star was reversible via repetitive reduction and oxidation. Dynamic fiat scattering measurements showed that the average diameter of the cleaved star polymer was around 20 nm. The dynamic mechanical properties of these star copolymers were characterized through examination of the temperature dependencies or their shear moduli. The results showed that SS-functionalized star polymers respond to reduction-oxidation conditions, indicating that the disulfide bonds do cleave and re-form. These stimuli responsive star polymers have potential utility as intelligent polymeric materials such as self-healing materials.

引用

页码：4133 / 4139

页数：7

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