Synthesis and characterization of a water-soluble rigid-rod polymer
Synthesis and characterization of a water-soluble rigid-rod polymer
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水溶性硬棒聚合物的合成与表征
DOI：
10.1016/j.polymer.2003.10.016
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发表时间：
2003
期刊：
影响因子：
4.6
通讯作者：
S. Picken
中科院分区：
文献类型：
--
作者：
S. Viale;W. Jager;S. Picken
以TMSCl活化的2，5-二氨基苯磺酸和邻苯二甲酰氯为原料，合成了水溶性聚芳酰胺。使用这种方法，我们实现了聚合物的分子量高达18，000 g mol−1。合成了两种模型化合物，以确定三甲基硅基氯化物作为该反应的活化剂的效果。通过特性粘数测量、尺寸排阻色谱（SEC）、DMA、TGA、火焰吸收原子光谱（FAAS）、NMR光谱和光学偏振显微镜对所得的磺化聚芳酰胺进行了表征。在所有情况下，聚合物在高达20wt%的浓度下容易溶于热水。在冷却时，在低聚合物浓度（通常为2- 5wt%）下观察到分子聚集体的溶致排列。低分子量的聚合物不表现出这种行为。由这些磺化芳酰胺聚合物制成的膜显示出良好的热稳定性，并且具有令人感兴趣的机械性能。我们的研究结果表明存在的结构组成的分子聚集体。
Water-soluble polyaramides have been prepared from 2,5-diaminobenzene-sulphonic-acid activated by TMSCl and terephthalic-acid-chloride. Using this method, we achieved molecular weights of our polymers up to 18,000 g mol−1. Two model compounds were synthesized in order to establish the effect of trimethylsilyl-chloride, which was used as the activating agent for this reaction. The resulting sulphonated poly-aramides were characterized by: inherent viscosity measurements, size exclusion chromatography (SEC), DMA, TGA, flame absorbance atomic spectroscopy (FAAS), NMR spectroscopy and optical polarisation microscopy. In all cases, the polymers were easily soluble in hot water up to concentrations of 20wt%. Upon cooling lyotropic alignment of molecular aggregates is observed at low polymer concentrations, typically 2–5wt%. Polymers with low molecular weights do not show this behaviour. Films made from these sulphonated aramide polymers showed good thermal stability, and have interesting mechanical properties. Our results indicate the presence of a structure consisting of molecular aggregates.