Copper crosslinked silicone elastomers in RGB colors: Degradable on Demand

IF 1.1 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY
Daniel Hrabowyj, Liam A. Wittenberg, Erin M. Donahue-Boyle, Yang Chen, Michael A. Brook
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引用次数: 1

Abstract

Increasing demand for fully recyclable polymers has prompted an interest in materials crosslinked via non-covalent interactions. Aggressive depolymerization can cleave backbone SiO bonds to generate linear oils or cyclic monomers from silicone rubbers, but one would rather recover the starting material oils simply by selectively breaking crosslinks. We demonstrate that ligand binding to metals can be used to reversibly crosslink silicone chains. Aminopropylsilicones were crosslinked via complexation with copper (II) acetate to form blue silicone oils. These oils slowly cured in air at room temperature to form soft, green elastomers over a month, or overnight at 50-55 °C in air to give robust, hard red elastomers. Potential explanations for the observed color changes are discussed. Elastomers prepared by either pathway underwent ready degradation by removal of the copper ions via competitive ligand binding using ethylenediamine, allowing for recovery of the unmodified silicone oil; the recovered amine could be reused with more copper to form a (softer) elastomer. This process provides a method for the synthesis of stable elastomeric silicones that are degradable on demand.
RGB颜色的铜交联有机硅弹性体:按需降解
对完全可回收聚合物的需求不断增加,促使人们对通过非共价相互作用交联的材料产生了兴趣。侵略性解聚可以使硅橡胶的主SiO键断裂,生成线性油或环状单体,但人们更愿意通过选择性地破坏交联来恢复原料油。我们证明了配体与金属的结合可以用来可逆交联有机硅链。氨基丙基有机硅通过与醋酸铜(II)络合形成蓝色硅油。这些油在室温下在空气中缓慢固化一个月形成柔软的绿色弹性体,或在50-55°C的空气中过夜形成坚固的坚硬的红色弹性体。对观察到的颜色变化的可能解释进行了讨论。通过两种途径制备的弹性体通过乙二胺竞争配体结合去除铜离子,使未改性的硅油得以回收,从而进行了直接降解;回收的胺可以与更多的铜一起重复使用,形成(更软的)弹性体。该工艺为合成可按需降解的稳定弹性有机硅提供了一种方法。& # x0D;
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来源期刊
Canadian Journal of Chemistry
Canadian Journal of Chemistry 化学-化学综合
CiteScore
1.90
自引率
9.10%
发文量
99
审稿时长
1 months
期刊介绍: Published since 1929, the Canadian Journal of Chemistry reports current research findings in all branches of chemistry. It includes the traditional areas of analytical, inorganic, organic, and physical-theoretical chemistry and newer interdisciplinary areas such as materials science, spectroscopy, chemical physics, and biological, medicinal and environmental chemistry. Articles describing original research are welcomed.
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