Controlled Ring-Opening Polymerization Initiated via Self-Complementary Hydrogen-Bonding Units
Controlled Ring-Opening Polymerization Initiated via Self-Complementary Hydrogen-Bonding Units
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DOI：
10.1021/ma702699t
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发表时间：
2008-05
期刊：
影响因子：
5.5
通讯作者：
A. Celiz;O. Scherman
中科院分区：
文献类型：
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作者：
A. Celiz;O. Scherman
以辛酸亚锡（II）为引发剂，采用自互补四重氢键阵列2-脲基-4 [1H]-嘧啶酮（UPy）功能化引发剂，在甲苯中实现了α-己内酯（α-CL）的可控阴离子开环聚合，得到了能够进行超分子自组装的UPy−聚（α-己内酯）链.这些聚合物的分子量从2000到20 000 g/mol不等，并使用1H NMR端基分析以及凝胶渗透色谱法测定。此外，使用乌氏溶液粘度计，当在氯仿中测量时，样品表现出粘均分子量的显著增加，表明当与二甲基甲酰胺（DMF）中的聚合物溶液相比时，UPy链端呈二聚形式。
Controlled anionic ring-opening polymerization of ϵ-caprolactone (ϵ-CL) in toluene using self-complementary quadruple hydrogen bonding array 2-ureido-4[1H]-pyrimidinone (UPy)-functionalized initiators with stannous(II) octanoate has been achieved to yield UPy−poly(ϵ-caprolactone) chains capable of undergoing supramolecular self-assembly. Molecular weights of these polymers varied from 2000 to 20 000 g/mol and were determined using 1H NMR end-group analysis as well as gel permeation chromatography. Furthermore, using Ubbelohde solution viscometry, samples demonstrated a marked increase in viscosity-average molecular weight when measured in chloroform, indicating that the UPy chain ends are in a dimerized form when compared to polymer solutions in dimethylformamide (DMF).