Mechanism of the pH-induced aggregation reaction between melamine and phosphate

被引：32

作者：

Huang, Sheng Tian ^{[1
,2
]}

Wang, Gang Lin ^{[1
]}

Li, Nian Bing ^{[1
]}

Luo, Hong Qun ^{[1
]}

机构：

[1] Southwest Univ, Key Lab Ecoenvironm Three Gorges Reservoir Reg, Sch Chem & Chem Engn, Minist Educ, Chongqing 400715, Peoples R China

[2] Sichuan Univ Sci & Engn, Coll Chem & Pharmaceut Engn, Zigong 643000, Peoples R China

来源：

RSC ADVANCES | 2012年 / 2卷 / 29期

基金：

中国国家自然科学基金;

关键词：

RESONANCE LIGHT-SCATTERING; RETARDED POLYPROPYLENE COMPOSITES; FLAME RETARDATION; THERMAL-DEGRADATION; POWDER-DIFFRACTION; PENTAERYTHRITOL; SULFATE;

D O I：

10.1039/c2ra21415f

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The mechanism of the pH-induced aggregation reaction between melamine (Mel) and phosphate (Ps) has been studied using a combination of resonance Rayleigh scattering (RRS), FTIR, UV-visible spectra, and single-crystal X-ray and powder X-ray diffraction for the first time. The results confirm that the aggregation reaction between Mel and Ps is highly pH-dependent. Changes in pH dramatically influence the molar ratio of Mel to melaminium (Hmel(+)) and subsequently affect the synergistic nature of hydrogen bonding, electrostatic and pi-pi stacking interactions, resulting in the reversibility of the aggregation and dissolution process. The composition of the Mel-Ps aggregates has been characterized as 2[Hmel(+)]center dot[HPO42-]center dot 3H(2)O. Mechanism analysis demonstrated that there exist two different methods for the transformation of Mel into Hmel(+) by considering the aggregation reaction process and conditions.

引用

页码：10948 / 10954

页数：7

共 44 条

[1]

Adam Farook, 2010, Acta Crystallogr Sect E Struct Rep Online, V66, po3033, DOI 10.1107/S1600536810043941

[2] Acid-induced cold gelation of globular proteins: Effects of protein aggregate characteristics and disulfide bonding on rheological properties [J].