Center for Education and Research on Macromolecules (CERM)
Disciplines :
Chemistry Materials science & engineering
Author, co-author :
Trollsas, Michaël; Almaden Research Center, IBM Research Division, San Jose, California > NSF Center for Polymeric Interfaces and Macromolecular (CPIMA)
Hedrick, James L.; Almaden Research Center, IBM Research Division, San Jose, California > NSF Center for Polymeric Interfaces and Macromolecular (CPIMA)
Mecerreyes, David; Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Dubois, Philippe ; Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Jérôme, Robert ; Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Ihre, H.; Royal Institute of technology, Stockholm, Sweden > Department of Polymer Technology
Hult, A.; Royal Institute of technology, Stockholm, Sweden > Department of Polymer Technology
Language :
English
Title :
Versatile and controlled synthesis of star and branched macromolecules by dentritic initiation
Publication date :
29 December 1997
Journal title :
Macromolecules
ISSN :
0024-9297
eISSN :
1520-5835
Publisher :
Amer Chemical Soc, Washington, United States - Washington
F.R.S.-FNRS - Fonds de la Recherche Scientifique NSF-funded Center on Polymer Interfaces and Macromolecular Assemblies (CPIMA) under Award No. DMR-9400354 Swedish Institute Axel Wenner-Gren Foundation
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1H-NMR spectra were recorded in solution with a Bruker AM 250 (250 MHz) spectrometer, with the TMS proton signal as an internal standard. The number average molecular weight of the polymers were calculated from the ratio of the OCH2 methylene proton signals (δ = 4.05) and the HOCH2 methylene proton signals (δ = 3.65) in the 1H-NMR spectra. 13C-NMR spectra were recorded at 62.9 MHz on a Bruker AM 250 spectrometer with the solvent carbon signal as an internal standard. Analytical TLC was performed on commercial Merck plates coated with silica gel GF254 (0.25 mm thick). The silica gel for flash chromatography was Merck Kieselgel 60 (230-400 mesh). Size exclusion chromatography was carried out on a Waters chromatograph connected to a Waters 410 differential refractometer. Four 5 μm Waters columns (300 × 7.7 mm) connected in series in order of increasing pore size (100, 1000, 105, and 106 A) were used with THF as solvent.
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