论文部分内容阅读
铈离子与醇、醛、酮、α-羟基酸等组成的体系能引发烯类单体进行自由基聚合。关于铈离子与酯类化合物体系文献报道甚少。孙燕慧发现脂肪酸酯或芳香酸酯对铈离子引发丙烯酰胺(AAM)聚合能起促进作用,提高聚合速度只R_(p)但活性较小,相对聚合速度只,为1.3左右。本文研究了二元酸酯、乙酰乙酸乙酯(EACAC)分别与铈离子组成的体系引发AAM聚合,实验结果表明EACAC有很高的活性,它与铈离子组成的体系为一氧化还原引发体系。应用自由基捕捉技术和ESR波谱研究,能检测到由EACAC组分反应产生的自由基,从聚合物端基的FT-IR光谱分析,证实了该自由基能引发单体聚合而成为聚合物的端基。从而讨论了引发机理。
Cerium ions and alcohols, aldehydes, ketones, α-hydroxy acids and other systems can lead to vinyl monomers for free radical polymerization. There is little literature on cerium ion and ester system. Sun Yanhui found that fatty acid ester or aromatic acid ester can promote the polymerization of cerium ion-initiated acrylamide (AAM), and increase the polymerization rate only R_ (p) but the activity is small, the relative polymerization rate is only about 1.3. In this paper, the polymerization of AAC with diacid ester, ethyl acetoacetate (EACAC) and cerium ion respectively was studied. The experimental results show that EACAC has a high activity and the system composed of cerium ion and the redox initiator system. Free radical trapping technique and ESR spectroscopy were used to detect the free radicals produced by the reaction of EACAC components. FT-IR spectra of the polymer end groups showed that the free radicals could initiate the polymerization of monomers to become polymers End groups. Thus discussing the triggering mechanism.