Thermochemical studies of twist-twist pi conjugated, sterically crowded stilbenes using simultaneous TG-DTA

被引：0

作者：

O'Connell, C ^{[1
]}

Sekher, P ^{[1
]}

Luzik, ED ^{[1
]}

Gano, JE ^{[1
]}

机构：

[1] Univ Toledo, Dept Chem, Toledo, OH 43606 USA

来源：

THERMOCHIMICA ACTA | 1999年 / 341卷

关键词：

twist-twist pi conjugated stilbenes; TTPC; phase transitions; thermogravimetry; rising temperature kinetics; Arrhenius equation;

D O I：

暂无

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

The thermal transformations of three twist-twist pi conjugated, sterically crowded stilbenes were monitored using simultaneous TG-DTA with a rising temperature program. The simplest compound, di-tert-butylstilbene, 1, was shown to melt and then completely evaporate. Compound 2, an extended version of 1 with three rings, melted and then partially evaporated, forming an intermediate, which evaporated at a higher temperature. An endothermic peak was observed in both 1 and 2 prior to the main melting point. This peak corresponds to a solid/solid or solid/liquid crystal phase transition. Compound 3, an extended version of 1 with four rings, completely sublimed. The activation energies and frequency factors were calculated for evaporation or sublimation, using the Arrhenius method. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：263 / 269

页数：7