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Molecular Mass Characteristics of (2‐Benzothiazolon‐3‐yl)acetic Acid–Telechelic Poly(ethylene oxide)s Determined by MALDI‐TOF Mass Spectrometry and SEC
Author(s) -
Mincheva Zoia,
Georgiev George,
Kalcheva Veneta
Publication year - 2002
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/1521-3935(20020201)203:3<538::aid-macp538>3.0.co;2-u
Subject(s) - ethylene oxide , chemistry , ethylene glycol , mass spectrometry , molecular mass , acetic acid , ethylene , desorption , oxide , peg ratio , size exclusion chromatography , matrix assisted laser desorption/ionization , polymer chemistry , time of flight mass spectrometry , chromatography , organic chemistry , polymer , catalysis , ionization , ion , copolymer , adsorption , finance , economics , enzyme
Abstract (2‐benzothiazolon‐3‐yl)acetic acid–telechelic poly(ethylene oxide)s (1 100–4 440 Da) with narrow molecular mass distributions (MMD) were analysed by matrix‐assisted laser desorption‐ionisation time‐of‐flight mass spectrometry (MALDI‐TOF MS) and size exclusion chromatography (SEC). The average molecular masses ( M̄ n and M̄ w ) determined by both methods were compared and a good agreement established. The cutting of the low molecular part of the initial poly(ethylene glycol) MMD during purification and isolation of the produced telechelic poly(ethylene oxide)s was proved. For this reason, the degree of esterification ( x ) of poly(ethylene glycol) (PEG) with (2‐benzothiazolon‐3‐yl)acetic acid was calculated by MALDI‐TOF MS and SEC, using additional UV data. The two series of x values derived from the M̄ n ‐values, determined by the two methods, are very close. All of them are less than unity and the differences between the two types of x values decrease with the PEG molecular mass growth.