Mechanochemical Activation of Covalent Bonds in Polymers with Full and Repeatable Macroscopic Shape Recovery

被引：354

作者：

Gossweiler, Gregory R. ^{[1
]}

Hewage, Gihan B. ^{[1
]}

Soriano, Gerardo ^{[1
]}

Wang, Qiming ^{[2
]}

Welshofer, Garrett W. ^{[1
]}

Zhao, Xuanhe ^{[2
]}

Craig, Stephen L. ^{[1
]}

机构：

[1] Duke Univ, Dept Chem, Durham, NC 27708 USA

[2] Duke Univ, Dept Mech Engn & Mat Sci, Durham, NC 27708 USA

来源：

ACS MACRO LETTERS | 2014年 / 3卷 / 03期

基金：

美国国家科学基金会;

关键词：

MICROFLUIDIC SYSTEMS; POLYDIMETHYLSILOXANE; COPOLYMERS; REACTIVITY; PATHWAYS;

D O I：

10.1021/mz500031q

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 [高分子化学与物理];

摘要：

Covalent mechanochemistry within bulk polymers typically occurs with irreversible deformation of the parent material. Here we show that embedding mechanophores into an elastomeric poly(dimethylsiloxane) (PDMS) network allows for covalent bond activation under macroscopically reversible deformations. Using the colorimetric mechanophore spiropyran, we show that bond activation can be repeated over multiple cycles of tensile elongation with full shape recovery. Further, localized compression can be used to pattern strain-induced chemistry. The platform enables the reversibility of a secondary strain-induced color change to be characterized. We also observe mechanical acceleration of a flex-activated retro-Diels-Alder reaction, allowing a chemical signal to be released in response to a fully reversible deformation.

引用

页码：216 / 219

页数：4

共 60 条

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Force-Reactivity Property of a Single Monomer Is Sufficient To Predict the Micromechanical Behavior of Its Polymer [J].