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The preparation of ultra narrow molecular weight distribution poly(ethylene glycol)s by fractional crystallization from solution
Author(s) -
Şen Murat,
Güven Olgun
Publication year - 2001
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/1097-4628(20010314)79:11<1999::aid-app1008>3.0.co;2-j
Subject(s) - crystallization , ethylene glycol , peg ratio , molar mass distribution , fractionation , polymer chemistry , materials science , fractional crystallization (geology) , size exclusion chromatography , differential scanning calorimetry , chemical engineering , chromatography , chemistry , polymer , organic chemistry , thermodynamics , composite material , physics , finance , geophysics , mantle (geology) , engineering , economics , enzyme
The preparation of very narrow molecular weight distribution poly(ethylene glycol) (PEG) was investigated by fractional crystallization from solution. Fractionation experiments were conducted from the solutions of 1500, 2000, and 3000 molecular weight PEG in n ‐butanol/ n ‐heptane mixtures. Size Exclusion Chromatography and Differential Scanning Calorimetric studies were performed for the characterization of fractions prepared at different crystallization temperatures and times. By suitable choice of these experimental parameters it was possible to obtain PEG fractions with M w /M n ≤ 1.05. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 79: 1999–2005, 2001