Synthesis of new degradable polymers containing azo-group in a polymer chain

氮化合物（氮杂二烯）不能被自由基引发剂或阳离子引发剂聚合，而容易被阴离子引发剂聚合。在此基础上，用不同的引发剂进行了α， ω-二烷基苄基丁二烯的阴离子聚合，表明用某些阴离子引发剂可以得到具有1,4-反式单体单元的立体规则聚合物。结果表明，烷基碘化镁是制备高分子量立体规整聚合物的最佳引发剂。通过DSC和热重分析研究了聚合物的热降解性。在150℃以上，立体规则聚合物完全分解为相应的烯烃和氮。在紫外光照射下，偶氮基可以由反式异构化为顺式异构化。聚合物分子在由反式到顺式异构化过程中发生了膨胀和收缩。研究了该方法的实际应用。

Azine compounds (azabutadienes) are not polymerized by radical initiators or cationic initiators, but easily polymerized by anionic initiators. In the extension of this finding, anionic polymerizations of α, ω-dialkylazabutadiene were performed with various kinds of initiator, indicating that stereoregular polymers with 1,4-trans monomer unit were obtained with some of anionic initiators. Accordingly, the optimum conditions for the preparation of the stereoregular polymers was investigated by various kinds of anionic initiators, which indicates that alkyl magnesium iodide was the best initiator for the stereoregular polymer with high molecular weight. The thermal degradability of the polymers was investigated by DSC and thermogravitomeric analysis. The stereoregular polymers were completely decomposed to the corresponding olefins and nitrogen above 150℃.The stereoregular have azo-group in trans-form, which can is allowed to isomerize reversibly from trans to cis under irradiation of UV light. The expansion and contraction of polymer molecule was found along with the isomerization from trans to cis. Practical application was investigated in this work.