Feng Xiao-Shuang, Taton Daniel, Chaikof Elliot L, Gnanou Yves
Laboratoire de Chimie des Polymères Organiques, Ecole Nationale Supérieure de Chimie et de Physique de Bordeaux, ENSCPB, 16 Avenue Pey Berland, 33607 Pessac Cedex, France.
J Am Chem Soc. 2005 Aug 10;127(31):10956-66. doi: 10.1021/ja0509432.
Dendrimer-like poly(ethylene oxide)s (PEOs) were synthesized by an iterative divergent approach combining anionic polymerization of ethylene oxide from multi-hydroxylated precursors and branching reactions of PEO chain ends. Partial deprotonation of the hydroxyls (< 30%) and use of dimethyl sulfoxide as solvent proved crucial for a "controlled/living" polymerization of ethylene oxide at room temperature. These sequences of reactions allowed us to prepare a dendrimer-like PEO up to the eighth generation with a molar mass of 900 000 g mol(-1) and 384 external hydroxyl functions. All samples from generation 1 to 8 were characterized by 1H NMR spectroscopy, light scattering, and viscometry. The evolution of the intrinsic viscosity versus the generation number of these dendrimer-like PEO is similar to that of regular dendrimers.
类树枝状聚环氧乙烷（PEO）通过迭代发散法合成，该方法结合了从多羟基化前体进行环氧乙烷的阴离子聚合以及PEO链端的支化反应。羟基的部分去质子化（<30%）以及使用二甲基亚砜作为溶剂对于室温下环氧乙烷的“可控/活性”聚合至关重要。这些反应序列使我们能够制备出高达第八代的类树枝状PEO，其摩尔质量为900 000 g mol(-1)，具有384个外部羟基官能团。从第1代到第8代的所有样品均通过1H NMR光谱、光散射和粘度测定进行了表征。这些类树枝状PEO的特性粘度随代数的变化与常规树枝状聚合物相似。
