ISSN:
0003-3146
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Description / Table of Contents:
Durch kationische ringöffnende Polymerisation von 2-Methyl-2-oxazolin (MeOZO) mit N,N′-Dimethyl-2,2′-tetramethylen-bis-(2-oxazolinium)-bis(methyl-p-toluolsulfonat) als Initiator wurden Poly(MeOZO)-Telechele mit verschiedenen Molekulargewichten erhalten, die mit Natriumcarbonat zu hydroxyterminierten Telechelen hydrolysiert wurden. Durch Vernetzung dieser Telechelen mit verschiedenen Pluriisocyanaten in Dimethylformamid (DMF) wurde eine Reihe nichtionischer Polyurethan-Hydrogele hergestellt, die in Wasser und hydrophilen Medien, z. B. DMF, hohe Quellungsgrade und in hydrophoben Medien, z. B. Toluol, niedrige Quellungsgrade aufweisen.
Notes:
N,N′-dimethyl-2,2′-tetramethylene-bis(2-oxazolinium) bis(methyl-p-toluene sulfonate) (II), a cationic polymerization initiator, was synthesized by the reaction of methyl p-toluene sulfonate with 2,2′-tetramethylene-bis-2-oxazoline (I) and a cationic ring-opening polymerization of 2-methyl-2-oxazoline [MeOZO] in the presence of (II) was carried out to produce poly(MeOZO) telechelics with various molecular weights. These telechelics were hydrolyzed with an aqueous solution of sodium carbonate to obtain hydroxy terminated telechelics of poly(MeOZO). A series of nonionic polyurethane hydrogels was prepared by the crosslinking reactions of the poly(MeOZO) glycol with pluriisocyanates in the presence of ferric acetylacetonate and DMF as the catalyst and reaction medium, respectively. The hydrogels showed good swelling degrees for water and hydrophilic solvents such as DMF, and bad swelling degree for a hydrophobic solvent such as toluene.
Additional Material:
2 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/apmc.1991.051900111
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