TY - JOUR
T1 - Synthesis of new polymethyloxazoline hydrogels by the "macroinitiator" method
AU - Rueda, Juan
AU - Suica, Raúl
AU - Komber, Hartmut
AU - Voit, Brigitte
PY - 2003/5/7
Y1 - 2003/5/7
N2 - New polymethyloxazoline hydrogels are synthesized by the cationic ring-opening copolymerization of 2-methyl-2-oxazoline and 2,2′-tetramethylenebis(2-oxazoline), using random copolymers of chloromethylstyrene and methyl methacrylate, or of chloromethylstyrene and styrene as macroinitiators. The synthesis is carried out in benzonitrile at 110 °C in the presence of potassium iodide, which activates the chloromethyl group as initiating functionality. In general, the hydrogels are obtained very rapidly, with a yield of between 42 and 95 wt.-%. Besides its initiating function, the macroinitiator also provides the possibility of introducing heterogeneity into the hydrogel structure by forming rigid hydrophobic domains. The hydrogel structures were characterized by high-resolution magic angle spinning NMR spectroscopy, and their solvent absorption capacity was determined by swelling experiments in solvents of different polarity. The hydrogels showed a maximal swelling degree of 18 g of water and 40 g of methanol, respectively, per gram of the hydrogel.
AB - New polymethyloxazoline hydrogels are synthesized by the cationic ring-opening copolymerization of 2-methyl-2-oxazoline and 2,2′-tetramethylenebis(2-oxazoline), using random copolymers of chloromethylstyrene and methyl methacrylate, or of chloromethylstyrene and styrene as macroinitiators. The synthesis is carried out in benzonitrile at 110 °C in the presence of potassium iodide, which activates the chloromethyl group as initiating functionality. In general, the hydrogels are obtained very rapidly, with a yield of between 42 and 95 wt.-%. Besides its initiating function, the macroinitiator also provides the possibility of introducing heterogeneity into the hydrogel structure by forming rigid hydrophobic domains. The hydrogel structures were characterized by high-resolution magic angle spinning NMR spectroscopy, and their solvent absorption capacity was determined by swelling experiments in solvents of different polarity. The hydrogels showed a maximal swelling degree of 18 g of water and 40 g of methanol, respectively, per gram of the hydrogel.
KW - High-resolution magic angle spinning NMR
KW - Hydrogels
KW - Macroinitiator
KW - Polyoxazoline
KW - Swelling
UR - http://www.scopus.com/inward/record.url?scp=0038580876&partnerID=8YFLogxK
U2 - 10.1002/macp.200390065
DO - 10.1002/macp.200390065
M3 - Article
AN - SCOPUS:0038580876
SN - 1022-1352
VL - 204
SP - 954
EP - 960
JO - Macromolecular Chemistry and Physics
JF - Macromolecular Chemistry and Physics
IS - 7
ER -