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Synthesis of sugar-based macromolecules via sono-ATRP in miniemulsion

机译：通过Sono-ATRP在微乳液中合成糖基大分子

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Ultrasound-mediated atom transfer radical polymerization (sono-ATRP) in miniemulsion media is used for the first time for the preparation of complex macromolecular architectures by a facile two-step synthetic route. Initially, esterification reaction of sucrose or lactulose with alpha-bromoisobutyryl bromide (BriBBr) is conducted to receive multifunctional ATRP macroinitiators with 8 initiation sites, followed by polymerization of n-butyl acrylate (BA) forming arms of the star-like polymers. The brominated lactulose-based molecule was examined as an ATRP initiator by determining the activation rate constant (k(a)) of the catalytic process in the presence of a copper(II) bromide/tris(2-pyridylmethyl)amine ((CuBr2)-Br-II/TPMA) catalyst in both organic solvent and for the first time in miniemulsion media, resulting in k(a) = (1.03 +/- 0.01) x 10(4) M-1 s(-1) and k(a) = (1.16 +/- 0.56) x 10(3) M-1 s(-1), respectively. Star-like macromolecules with a sucrose or lactulose core and poly(n-butyl acrylate) (PBA) arms were successfully received using different catalyst concentration. Linear kinetics and a well-defined structure of synthesized polymers reflected by narrow molecular weight distribution (M-w/M-n = 1.46) indicated 105 ppm wt of catalyst loading as concentration to maintain controlled manner of polymerization process. H-1 NMR analysis confirms the formation of new sugar-inspired star-shaped polymers.
机译：超声介导的原子转移自由基聚合（SONO-ATRP）在微乳液中的第一次用来制备复合大分子架构通过容易的两步合成途径制备复合大分子架构。最初，进行蔗糖或乳糖的酯化反应与α-溴异丁酰基溴（Bribbr），以接收具有8个引发位点的多功能ATRP大胆，然后聚合丙烯酸正丁酯（Ba）的形成星形聚合物的臂。通过在铜（II）溴化物/三（2-吡啶基甲基）胺（（CUBR2）存在下，通过测定催化过程的活化率常数（K（A））来检查溴化乳糖糖基分子作为ATRP引发剂-UR-II / TPMA）催化剂在有机溶剂中，并在微乳液介质中首次，得到K（a）=（1.03 +/- 0.01）×10（4）m-1s（-1）和k （a）=（1.16 +/- 0.56）×10（3）m-1 s（-1）。使用不同的催化剂浓度成功地接受具有蔗糖或乳花糖芯和聚（正丁基丙烯酸酯）（PBA）臂的星状大分子和聚（正丁基丙烯酸酯）臂。线性动力学和由窄分子量分布（M-W / M-N = 1.46）反射的合成聚合物的明确结构，指示105ppm wt的催化剂负载作为浓度，以保持控制的聚合方法的控制方式。 H-1 NMR分析证实了新的糖启发的星形聚合物的形成。

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