Mechanoluminescent Imaging of Osmotic Stress-Induced Damage in a Glassy Polymer Network.
Mechanoluminescent Imaging of Osmotic Stress-Induced Damage in a Glassy Polymer Network.
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DOI：
10.1021/acs.macromol.6b02540
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发表时间：
2017-03-14
期刊：
影响因子：
5.5
通讯作者：
Sijbesma RP
中科院分区：
文献类型：
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作者：
Clough JM;van der Gucht J;Sijbesma RP
利用双（金刚烷基-1，2-二氧杂环丁烷）作为荧光机械载体，研究了氯仿在玻璃态聚甲基丙烯酸甲酯（PMMA）网络中的共价键断裂.双（金刚烷基）-1，2-二氧杂环丁烷单位纳入作为交联剂进行机械发光断裂，表明溶剂进入引起共价键断裂。在更高的交联密度下，光发射采取数百个离散的爆发的形式，强度变化很大，每个爆发由107-109个光子组成。相机成像表明，通过材料的突发传播相对较慢，并允许离散的键断裂事件之间的空间相关性的分析。这些意见的吸附和断裂机制的影响进行了讨论。
A chemiluminescent mechanophore, bis(adamantyl-1,2-dioxetane), is used to investigate the covalent bond scission resulting from the sorption of chloroform by glassy poly(methyl methacrylate) (PMMA) networks. Bis(adamantyl)-1,2-dioxetane units incorporated as cross-linkers underwent mechanoluminescent scission, demonstrating that solvent ingress caused covalent bond scission. At higher cross-linking densities, the light emission took the form of hundreds of discrete bursts, widely varying in intensity, with each burst composed of 107–109 photons. Camera imaging indicated a relatively slow propagation of bursts through the material and permitted analysis of the spatial correlation between the discrete bond-breaking events. The implications of these observations for the mechanism of sorption and fracture are discussed.