Synthesis, microstructure, and acidity of poly (vinylphosphonic acid)
Synthesis, microstructure, and acidity of poly (vinylphosphonic acid)
复制标题
DOI：
10.1002/marc.200600513
复制
发表时间：
2006-10-24
影响因子：
4.6
通讯作者：
Wegner, Gerhard
中科院分区：
文献类型：
--
作者：
Bingol, Bahar;Meyer, Wolfgang H.;Wegner, Gerhard
乙烯基膦酸在80℃下通过自由基聚合聚合得到高分子量聚合物((M) / bar (w)为6.2 x 10(4))，由静态光散射测定。高分辨率核磁共振光谱用于获取微结构信息。基于四分体概率的信息被用来推断一个几乎无战术的配置。此外，C-13核磁共振光谱给出了头对头和尾对尾链接存在的证据。对H-1核磁共振谱的精细分析可以定量确定这些链接的比例（占所有链接的23.5%）。实验证据表明，聚合是通过乙烯基膦酸酐作为中间体进行环聚合的。滴定曲线表明，高分子量聚乙烯基膦酸（PVPA）表现为单质子酸。
Vinylphosphonic acid is polymerized at 80 degrees C by free radical polymerization to give a high-molecular-weight polymer ((M) over bar (w) of 6.2 x 10(4)) as determined by static light, scattering. High-resolution NMR spectroscopy is used to gain microstructure information. Information based on tetrad probabilities is utilized to deduce an almost atactic configuration. In addition, C-13 NMR spectroscopy give I S evidence for the presence of head-to-head and tail-to-tail links. Refined analysis of the H-1 NMR spectra allows for the quantitative determination of the fraction of these links (23.5% of all links). Experimental evidence suggests that the polymerization proceeds via cyclopolymerization of the vinylphosphonic acid anhydride as an intermediate. Titration curves indicate that high-molecular-weight poly (vinylphosphonic acid) PVPA behaves as a monoprotic acid.