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采用滴定实验法分别测试了衣康酸(IA)、丙烯酰胺(AM)、丙烯酸甲酯(MA)与丙烯腈(AN)一系列单体组成比时的云点;采用红外光谱、示差扫描量热分析和热失重分析研究了共聚单体的选择对共聚物热稳定化反应的影响和机理及其与共聚体系反应活性的关联.结果显示,IA、AM或MA的引入有利于提高AN聚合体系的云点,不同共单体用量构成的云点迹线斜率可以比较共聚体系反应活性,并对AN共聚体系组成的优化选择具有普适性;而AN与IA较高的共聚反应活性使得P(AN/IA)聚合物热稳定性能好,氰基未环化指数、环化反应起始温度及表观活化能低,环化反应速率快,这可能由于IA分子结构含有2个羧基,引发活性点较多,可以在低温条件下引发氰基环化形成更多的梯形结构.
The cloud points of a series of monomer compositions of itaconic acid (IA), acrylamide (AM), methyl acrylate (MA) and acrylonitrile (AN) were measured by titration test. The infrared spectra, Thermal analysis and thermogravimetric analysis were used to study the influence of comonomer selection on the thermal stability of the copolymer and its relationship with the copolymerization activity.The results showed that the introduction of IA, Cloud points, the cloud point trace of the composition of different components can be compared with the slope of the cloud point of the copolymerization reaction system activity, and the optimal choice of AN copolymer system composition has universal; and AN and IA higher copolymerization activity makes P ( AN / IA) polymer has good thermal stability, cyanide uncyclization index, low cyclization initiation temperature and apparent activation energy, and high cyclization rate. This may be due to the fact that the molecular structure of IA contains two carboxyl groups and the activity More points, can be induced under low temperature cyanide cyclization to form more trapezoidal structure.