The preparation of ultra narrow molecular weight distribution poly(ethylene glycol)s by fractional crystallization from solution

Authors
Sen, M Guven, O
Citation
M. Sen et O. Guven, The preparation of ultra narrow molecular weight distribution poly(ethylene glycol)s by fractional crystallization from solution, J APPL POLY, 79(11), 2001, pp. 1999-2005
Citations number
21
Categorie Soggetti
Organic Chemistry/Polymer Science","Material Science & Engineering
Journal title
JOURNAL OF APPLIED POLYMER SCIENCE
ISSN journal
00218995 → ACNP
Volume
79
Issue
11
Year of publication
2001
Pages
1999 - 2005
Database
ISI
SICI code
0021-8995(20010314)79:11<1999:TPOUNM>2.0.ZU;2-L
Abstract
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 Exclus ion Chromatography and Differential Scanning Calorimetric studies were perf ormed for the characterization of fractions prepared at different crystalli zation temperatures and times. By suitable choice of these experimental par ameters it was possible to obtain PEG fractions with M-w/M-n less than or e qual to 1.05. (C) 2001 John Wiley & Sons, Inc.