Mechanophores with a Reversible Radical System and Freezing-Induced Mechanochemistry in Polymer Solutions and Gels

被引：231

作者：

Imato, Keiichi ^{[1
,2
]}

Irie, Atsushi ^{[2
]}

Kosuge, Takahiro ^{[1
]}

Ohishi, Tomoyuki ^{[3
]}

Nishihara, Masamichi ^{[3
]}

Takahara, Atsushi ^{[2
,3
]}

Otsuka, Hideyuki ^{[1
]}

机构：

[1] Tokyo Inst Technol, Dept Organ & Polymer Mat, Meguro Ku, Tokyo 1528550, Japan

[2] Kyushu Univ, Grad Sch Engn, Nishi Ku, Fukuoka 8190395, Japan

[3] Kyushu Univ, Inst Mat Chem & Engn, Nishi Ku, Fukuoka 8190395, Japan

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2015年 / 54卷 / 21期

关键词：

cross-linked polymers; dynamic covalent chemistry; gels; mechanochemistry; mechanochromism; CARBON-CENTERED RADICALS; DRIED POLY(ETHYLENE OXIDE); BOND-DISSOCIATION ENERGIES; DYNAMIC COVALENT BONDS; MECHANICAL FORCE; ACTIVATION; POLYSTYRENE; DEGRADATION; CHAIN; DIARYLBIBENZOFURANONE;

D O I：

10.1002/anie.201412413

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Visualization and quantitative evaluation of covalent bond scission in polymeric materials are highly important for understanding failure, fatigue, and deterioration mechanisms and improving the lifetime, durability, toughness, and reliability of the materials. The diarylbibenzofuranone-based mechanophore radical system enabled, through electron paramagnetic resonance spectroscopy, insitu quantitative evaluation of scission of the mechanophores and estimation of mechanical energy induced along polymer chains by external forces. The coagulation of polymer solutions by freezing probably generated force but did not cleave the mechanophores. On the other hand, cross-linking led to efficient propagation of the force of more than 80kJmol(-1) to some mechanophores, resulting their cleavage and generation of colored stable radicals. This mechanoprobe concept has the potential to elucidate other debated issues in the polymer field as well.

引用

页码：6168 / 6172

页数：5

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