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本文研究了4,4′-联苯二甲腈在4,4′-联苯二甲腈氯化锌配合物催化下的聚合反应动力学,氰基浓度通过以铁氰化钾为内标的石腊糊法的红外光谱定量分析法测定。结果表明:该聚合反应是二级反应,聚合反应速度和氰基浓度及配合物浓度各成一次方比例。聚合反应表观活化能为12.4千卡/克分子。此外,也研究了不同的4,4′-联苯二甲腈金属氯化物配合物为催化剂对4,4′-联苯二甲腈聚合反应速度的影响,并对聚合反应机理进行了讨论。 相似文献
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<正> 我们曾研究了4,4'-联苯二甲腈(I)在联苯二甲腈氯化锌配合物催化下的聚合反应动力学,结果表明,该聚合反应是二级反应,聚合反应速度与氰基和配合物的浓度各成一次方比例,可用下式表示: 相似文献
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腈类化合物由于氮原子具有孤电子对,它可以和很多含有空轨道的金属卤化物配位生成分子配合物。Walton曾对乙腈、苯甲腈等腈类化合物与一些金属卤化物的分子配合物作过综述。文献亦曾报道脂肪族二腈与金属卤化物能形成配合物,而芳香族二腈和金属卤化物生成分子配合物则未见文献报道。此外,芳香族二腈在某些金属氯化物Lewis酸存在下,于300℃左右能进行聚合。为了探讨芳香族二腈在这些Lewis酸 相似文献
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The polymerization kinetics of benzonitrile were studied, and the formation rate constants of s-triazine structure and linear polymer were determined. The influence of polymerization temperature and the amount of zinc chloride as catalyst on the ratio of linear to cyclic structure were also investigated, and the obtained results were discussed. 相似文献
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The polymerization kinetics of 4,4'-biphenyldicarbonitrile catalyzed by complex of 4,4'-biphenyl-dicarbonitrile with ZnCl_2 was studied. The cyano group concentration was measured by infrared spectroscopic analysis using potassium ferricyanide as the internal reference. The results proved that the polymerization is a second order reaction, and the activation energy of polymerization is 12.4 kcal/mol. The polymerization rates of 4,4'-biphenyldicarbonitrile catalyzed by other seven complexes were also measured. The polymerization mechanism was discussed. 相似文献
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The polymerization rates of fourteen aromatic and heterocyclic dinitriles were measured by infraredspectroscopy and compared with that of 4, 4′-biphenyldicarbonitrile. The rate is greatly enhancedwhen an electron withdrawing group is substituted at the para position of cyano group in aromaticdinitriles. The polymerization rates of heterocyclic dinitriles wer discussed in terms of π-lectrondensity of the heterocyclic rings. 相似文献
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