芳杂环二腈及其聚合物——Ⅹ.含苯并呋喃、苯并噻吩及喹啉环的二腈的合成及聚合

<正> 我们曾报道含不同苯并杂环二腈的合成、聚合及所得聚合物的热氧化稳定性。在这些二腈中与苯环相并的杂环皆含有二个杂原子。为了进一步阐明二腈的结构与聚合速度及所得聚合物热氧化稳定性的关系,本文合成了仅含一个杂原子与苯环相并的杂环化合物,即苯并呋喃、苯并噻吩及喹啉环的二腈(Ⅰ—Ⅲ)。

AROMATIC AND HETEROCYCLIC DINITRILES AND THEIR POLYMERS Ⅹ. Synthesis and Polymerization of the Dinitriles with Benzofuran,Benzothiophene and Quinoline Ring

The dinitriles Ⅰ-Ⅲ with benzofuran, benzothiophene andquinoline ring were synthesized. The polymerization rates of these dinitriles with 4 mole percent of zine chloride as catalyst at 300℃ were measured by infrared spectroscopy. The rate constants are 1.61, 2.63 and 3.09 l·mol-1sec-1, respectively. The TGA and isothermal weight loss at 371℃ in air of these three polymers were also measured, and the results indicated that the oxidative thermal stability of these polymers is not as good as that of the polymer of the dinitrile containing benzothiazole ring.