Novel glass-forming organic materials. 3. Cubane with pendant nematogens, carbazole, and disperse red 1
Novel glass-forming organic materials. 3. Cubane with pendant nematogens, carbazole, and disperse red 1
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新型玻璃形成有机材料。
DOI：
10.1021/ma961115j
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发表时间：
1997
期刊：
影响因子：
5.5
通讯作者：
A. Bashir
中科院分区：
文献类型：
--
作者：
Shaw H. Chen;J. Mastrangelo;Hongqin Shi;T. Blanton;A. Bashir
介晶和非介晶功能部分作为侧基连接到立方烷核心的玻璃形成能力和形态稳定性的混合系统的调查。线虫和咔唑被发现产生的混合动力系统，分别是无定形和各向同性的，都能够玻璃化与高于环境的玻璃化转变温度（T g s）。此外，发现DR 1在动力学控制条件下热加工时产生具有SA介晶性的混合系统;进一步证明可以获得具有95 °C的Tg的SA玻璃。另一方面，晶体是通过在结晶控制条件下的热处理获得的。在基于立方烷的五种模型化合物中，似乎侧基的熔融或透明温度越低，杂化体系的形态越稳定。有人还发现，金刚烷为基础的系统具有约相同的Tg与上级的形态稳定性相比，立方烷为基础的同行。
Mesogenic and nonmesogenic functional moieties were attached as pendant groups to the cubane core for an investigation of the glass-forming ability and morphological stability of the hybrid systems. Nematogens and carbazole were found to yield hybrid systems that are nematic and isotropic, respectively, all capable of vitrification with above-ambient glass transition temperatures (T g s). Moreover, DR1 was found to yield a hybrid system possessing S A mesomorphism upon thermal processing under kinetically controlled conditions; it was further demonstrated that S A glass could be obtained with a T g of 95 °C. On the other hand, crystals were obtained with thermal processing under thermodynamically controlled conditions. Of the five model compounds based on cubane, it appears that the lower the melting or clearing temperature of the pendant group, the more morphologically stable the hybrid system. It was also found that adamantane-based systems possess about the same T g with a superior morphological stability in comparison to the cubane-based counterparts.