Poly-2-oxazolidones: Preparation and characterization

Autor: W. Y. Whitmore, J. E. Herweh
Rok vydání: 1970
Předmět:
Zdroj: Journal of Polymer Science Part A-1: Polymer Chemistry. 8:2759-2773
ISSN: 1542-9350
0449-296X
DOI: 10.1002/pol.1970.150081004
Popis: Poly-2-oxazolidones were synthesized by the 1,3-cycloaddition of bisglycidyl ethers to diisocyanates with the use of N,N-dimethylformamide and lithium chloride as solvent and catalyst, respectively. A variety of arylene and alkylene diisocyanates and coreactant bisepoxides were used in the polymer-forming reaction. The polymers, obtained in high yield, were generally soluble in methylene dichloride, chloroform, N,N-dimethylformamide, and dimethyl sulfoxide. They had intrinsie viscosities up to 0.42 dl/g and could be cast into films. In several cases molecular weights were determined by vapor pressure osmometry. The poly-2-oxazolidone based upon 1,6-hexamethylene diisocyanate and the bisglycidyl ether of isopropylidene diphenol gave the highest molecular weight. Confirmation that the base unit of the polymers contains the 2-oxazolidone ring was obtained by elemental analysis, infrared and NMR spectroscopy. The poly-2-oxazolidones synthesized were found to be amorphous by x-ray diffraction. Thermogravimetric analyses indicated that a majority of the poly-2-oxazolidones were stable in dry air up to 300°C. In a number of cases Tg's were also determined by using differential scanning calorimetry.
Databáze: OpenAIRE
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