【摘要】 采用一维³¹p核磁共振(³¹p NMR)、二维J分解谱（J-resolved）和扩散核磁(³¹p DOSY)等方法,研究了高聚合度聚磷酸铵（APP）和多聚磷酸盐的特征磷及其偶合常数.研究表明,多聚磷酸盐及其中所含的二聚磷酸盐端基磷分别呈双峰和单峰特征,多聚磷酸盐自旋偶合裂分的端基磷共振峰的偶合常数为19.4 Hz. APP中含有小分子二聚磷酸铵和正磷酸铵,用³¹p NMR定量表征APP聚合度时需排除二聚体端基磷峰的面积.在100℃水中溶解APP制备的APP水溶液中,部分高聚合度APP发生断链,中间磷共振峰处出现短链APP的磷共振峰.更多还原

【Abstract】 In this paper,phosphorus nuclear magnetic resonance(³¹p NMR),J-resolved and ³¹p-DOSY are used to study the characteristic phosphorus and coupling constants of APP. Studies have shown that the endgroup phosphors of polyphosphate and diphosphate have double-peak and single-peak characteristics respectively,and the coupling constant of spin-coupled peak is 19.4 Hz;Ammonium phosphate（Ⅱ-APP）contains ammonium di-polyphosphate and ammonium orthophosphate. When ³¹p NMR is used to quantitatively characterize the degree of APP polymerization,the terminal phosphorus of ammonium di-polyphosphate should be excluded;when APP is prepared by dissolving APP in water at 100 ℃,the appearance of the phosphorus resonance peak of small molecule middle phosphorus proves that APP has partially broken chain.更多还原