Polymerization of A<sub>2</sub> with B<sub>3</sub> Monomers: A Facile Approach to Hyperbranched Poly(aryl ester)s
作者:Qin Lin、Timothy E. Long
DOI:10.1021/ma0257447
日期:2003.12.1
efficient approach to hyperbranched poly(aryl ester)s via the polycondensation of A2 and B3 monomers. A dilute bisphenol A (A2) solution was added slowly to a dilute 1,3,5-benzenetricarbonyl trichloride (B3) solution at 25 °C to prepare hyperbranched poly(aryl ester)s in the absence of gelation. The molar ratio of A2:B3 was maintained at 1:1, and the maximum final monomer concentration was ∼0.08 M. 1H
超支化聚合物因其低粘度,出色的溶解性和合成简便性的独特组合而受到了广泛的关注。本文介绍了一种通过A 2和B 3单体的缩聚反应制备超支化聚(芳基酯)的有效方法。在25℃下,将稀双酚A(A 2)溶液缓慢添加到稀1,3,5-苯三羰基三氯化物(B 3)溶液中,以制备超支化聚芳基酯。A 2:B 3的摩尔比保持为1:1,最大最终单体浓度为〜0.08 M. 11 H NMR光谱和端基的衍生化表明在缩聚过程中苯酚官能度被定量消耗。合成了两种模型化合物,以鉴定线性,树枝状和末端单元的1 H NMR共振,最终支化度确定为〜50%。此外,相对于它们的线性类似物,超支化聚合物表现出较低的玻璃化转变温度。