Organic Glasses of High Glass Transition Temperatures Due to Substitution with Nitrile Groups.
Organic Glasses of High Glass Transition Temperatures Due to Substitution with Nitrile Groups.
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DOI：
10.1021/acs.jpcb.9b08792
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发表时间：
2019-11
期刊：
影响因子：
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通讯作者：
Felix Krohn;C. Neuber;E. Roessler;H. Schmidt
中科院分区：
文献类型：
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作者：
Felix Krohn;C. Neuber;E. Roessler;H. Schmidt
分子玻璃的玻璃化转变温度(Tg)取决于其摩尔质量。然而，分子间相互作用的性质也对玻璃化转变温度和玻璃形成能力起着重要作用。在此背景下，我们报道了新型含腈基团的分子玻璃，并研究了这种高极性基团对玻璃化转变温度和玻璃形成能力的影响。作为参考化合物，我们研究了合成的含C-C键苯环的分子玻璃的热性质。所研究化合物的摩尔质量范围为341g/mol~568g/mol。尽管它们的摩尔质量相对较低，但观察到了从347K(74°C)到471K(198°C)的玻璃化转变温度。大多数化合物具有较高的T_g/T_m-值，介于0.7~0.8之间。通过引入高度相互作用的丁腈基团，可以将摩尔质量对Tg的依赖性增加2到3倍。
The glass transition temperature (Tg) of a molecular glass depends on its molar mass. However, the nature of intermolecular interactions also plays a major role in both the glass transition temperature and its glass-forming ability. In this context, we report on novel molecular glasses containing nitrile groups and investigate the influence of this highly polar group on Tg and the glass-forming ability. As reference compounds, we studied the thermal properties of synthesized molecular glasses with C-C-bonded phenyl rings. The molar mass of the studied compounds ranges from 341 g/mol to 568 g/mol. Despite their relatively low molar mass, glass transition temperatures from 347 K (74 °C) to 471 K (198 °C) were observed. Most of the compounds possess high T_g/T_m -ratios between 0.7 and 0.8. By introducing highly interacting nitrile groups, the dependence of the molar mass on Tg could be increased by a factor of 2 to 3.