Formation of poly(ethylene phosphates) in polycondensation of H₃PO₄ with ethylene glycol. Kinetic and mechanistic study
2008
Pretula, Julia | Kaluzynski, Krzysztof | Wisniewski, Blazej | Szymanski, Ryszard | Loontjens, Ton | Penczek, S (Stanisław)
Conditions of synthesis of poly(ethylene phosphates) in reaction of H₃PO₄ with HOCH₂CH₂OH (EG), the actual path of polycondensation, and structure of the obtained polymers (mostly oligomers) and kinetics of reaction are described. Preliminary kinetic information, based on the comparison of the MALDI-TOF-ms and ³¹P{¹H} NMR spectra as a function of conversion is given as well. Because of the dealkylation process fragments derived from di- and triethylene glycols are also present in the repeating units. Structures of the end groups (----CH₂CH₂OH or ----OP(O)(OH)₂) depend on the starting ratio of [EG]₀/[H₃PO₄]₀, although even at the excess of EG the acidic end groups prevail because of the dealkylation process. In MALDI-TOF-ms products with Pn equal up to 21 have been observed. The average polymerization degrees (Pn) are lower and have been calculated from the proportion of the end groups. © 2007 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 46: 830-843, 2008
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