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Features of Polymerization of Methyl Methacrylate using a Photocatalyst—the Complex Oxide RbTe1.5W0.5O6
Journal of Inorganic and Organometallic Polymers and Materials ( IF 3.9 ) Pub Date : 2021-06-10 , DOI: 10.1007/s10904-021-02054-6
Lyudmila Semenycheva , Victoria Chasova , Julia Matkivskaya , Diana Fukina , Andrey Koryagin , Tatiana Belaya , Alexandra Grigoreva , Yuri Kursky , Evgeny Suleimanov

Radical polymerization of methyl methacrylate in an aqueous emulsion was carried out using the complex oxide RbTe1.5W0.5O6 as a photoinitiator under visible light irradiation with λ = 400–700 nm. Study of the polymerization process and reaction products using methods of physical and chemical analysis (GPC, IR, NMR, etc.) has shown that there are several directions of monomer transformations at the same time. Polymethyl methacrylate with Mn ~ 140–145 kDa, produced in the organic phase, is a result of polymerization initiation by a hydroxyl radical formed due to complex transformations of electron–hole pairs during photocatalyst irradiation. Moreover, the interaction of the hydroxyl radical with OH-groups on the complex oxide RbTe1.5W0.5O6 surface and the subsequent formation of oxygen-centered radicals lead to grafting polymer macromolecules on the photocatalyst surface. In addition, methyl methacrylate is able to oxidize to a cyclic dimer with terminal double bonds and form a polymer with cyclic dimer links due to coordination by double bonds on the RbTe1.5W0.5O6 surface. The high activity of the hydroxyl radical allows to obtain the graft copolymer PMMA-pectin by grafting the polymer product on the surface of the natural polymer-pectin. Comparison of the sponge morphology of the graft copolymer PMMA-pectin and the initial pectin samples using the scanning electron microscopy has shown a noticeable difference in their structural and topological organization. It is especially interesting in terms of studying the properties of the graft copolymer as a material for the scaffolds.



中文翻译:

使用光催化剂-复合氧化物 RbTe1.5W0.5O6 聚合甲基丙烯酸甲酯的特性

甲基丙烯酸甲酯在水乳液中的自由基聚合使用复合氧化物 RbTe 1.5 W 0.5 O 6作为光引发剂在 λ = 400-700 nm 的可见光照射下进行。使用物理和化学分析方法(GPC、IR、NMR 等)对聚合过程和反应产物的研究表明,同时存在多个单体转化方向。Mn ~ 140-145 kDa 的聚甲基丙烯酸甲酯在有机相中产生,是由光催化剂照射期间电子-空穴对复杂转变形成的羟基自由基引发聚合反应的结果。此外,羟基自由基与复合氧化物上的 OH-基团的相互作用 RbTe 1.5 W0.5 O 6表面和随后形成的以氧为中心的自由基导致在光催化剂表面接枝聚合物大分子。此外,由于 RbTe 1.5 W 0.5 O 6上的双键配位,甲基丙烯酸甲酯能够氧化成具有末端双键的环状二聚体并形成具有环状二聚体连接的聚合物表面。羟基自由基的高活性允许通过在天然聚合物-果胶表面接枝聚合物产物来获得接枝共聚物PMMA-果胶。使用扫描电子显微镜比较接枝共聚物 PMMA-果胶和初始果胶样品的海绵形态,表明它们的结构和拓扑组织存在显着差异。在研究接枝共聚物作为支架材料的特性方面尤其有趣。

更新日期:2021-06-10
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