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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Aliphatic/Aromatic Systems under Irradiation: Influence of the Irradiation Temperature and of the Molecular Organization
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Aliphatic/Aromatic Systems under Irradiation: Influence of the Irradiation Temperature and of the Molecular Organization

机译：辐照下的脂肪/芳香体系：辐照温度和分子组织的影响

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摘要

With the aim of understanding the electronic excitation, charge or reactive species transfers occurring during irradiation, we studied the role of the aromatic content on ethylene/styrene random copolymers (PES) and on cyclohexane/benzene glasses (amorphous organic solids). Radiation-induced modifications were monitored in situ, at the molecular level, using Fourier transform infrared spectroscopy (FTIR). Irradiations were performed under a vacuum, and thanks to in situ measurements, oxidation was avoided, We followed both the C—C bond creation in the aliphatic moiety and the destruction of the aromatic moiety. The influence of the irradiation temperature was investigated by irradiating samples at room temperature and at 11 K. At such a low temperature, long-range migration hardly occurs and its influence is considerably reduced or could even vanish. Therefore, low temperature irradiation gives insight on the relative influence of reactive species transport and electronic excitation and charge transport. We found that the effect of lowering the PES irradiation temperature from room temperature to 11 K is small, indicating a minor role for the reactive species transport. Moreover, the two chosen systems allow the examination of the relative magnitude of intra-and intermolecular transfers. We demonstrate that, under conditions where reactive species are almost frozen, intermolecular transfers are very efficient.
机译：为了理解辐射过程中发生的电子激发，电荷或反应性物质转移，我们研究了芳族含量对乙烯/苯乙烯无规共聚物（PES）和环己烷/苯玻璃（无定形有机固体）的作用。使用傅里叶变换红外光谱（FTIR）在分子水平上对辐射诱导的修饰进行原位监测。辐照是在真空下进行的，由于进行了原位测量，避免了氧化。我们既在脂肪族部分中建立了CC键，又在芳香族部分中进行了破坏。通过在室温和11 K下辐照样品来研究辐照温度的影响。在如此低的温度下，几乎不会发生长距离迁移，并且其影响会大大降低甚至消失。因此，低温辐照可以洞悉反应性物质迁移以及电子激发和电荷迁移的相对影响。我们发现将PES辐照温度从室温降低到11 K的影响很小，这表明反应性物质运输的作用很小。而且，两个选择的系统允许检查分子内和分子间转移的相对量。我们证明，在反应物种几乎被冻结的条件下，分子间转移非常有效。

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