Iron Oxides as Heterogeneous Catalysts for Controlled/Living Radical Polymerization of Styrene and Methyl Methacrylate
Iron Oxides as Heterogeneous Catalysts for Controlled/Living Radical Polymerization of Styrene and Methyl Methacrylate
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DOI：
10.1021/ma102812n
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发表时间：
2011-04-12
期刊：
影响因子：
5.5
通讯作者：
Kamigaito, Masami
中科院分区：
文献类型：
--
作者：
Kanazawa, Arihiro;Satoh, Kotaro;Kamigaito, Masami
采用具有低价Fe（11）组分的氧化铁（FeO和Fe 3 O 4）的非均相体系，设计用于苯乙烯和甲基丙烯酸甲酯的可控/活性自由基聚合。在N，N-二甲基甲酰胺/甲苯或乙腈/甲苯的溶剂混合物中，以受控方式用FeO与带有C-Br键的烷基卤引发剂如α-溴苯基乙酸乙酯一起进行聚合，得到具有预定分子量的聚合物。反应的可控性得到改善后，加入n-Bu_4 NBr，得到的聚合物轴承理论M，，值和较窄的分子量分布。使用磁性Fe 3 O 4或零价Fe（0）也进行聚合，尽管可控性不如FeO。通过搅拌对反应速率的影响和其他聚合结果，提出了使用FeO的非均相催化机理。
Heterogeneous systems using iron oxides with low-valent Fe(11) components, FeO and Fe3O4, were designed for controlled/living radical polymerization of styrene and methyl methacrylate. The polymerizations with FeO in conjunction with an alkyl halide initiator bearing a C-Br bond such as ethyl alpha-bromophenylacetate proceeded in controlled fashions in the solvent mixtures of N,N-dimethylformamide/toluene or acetonitrile/toluene to yield polymers with predetermined molecular weights. The controllability of the reactions was improved upon the addition of n-Bu4NBr to give polymers bearing theoretical M,, values and narrower molecular weight distributions. The polymerizations also proceeded using magnetic Fe3O4 or zerovalent Fe(0), although the controllability was inferior to FeO. The heterogeneous catalytic mechanisms using FeO were suggested by the effect of stirring on the reaction rate and some other polymerization results.