Search

Copolymers of N-(2-hydroxyethyl)ethyleneimine and succinic anhydride without initiator were prepared under different experimental conditions. The composition of the copolymers was determined by elemental analyses andH-NMR spectroscopy. From the results of FT-IR andH-NMR spectroscopy a scheme of copolymerization via zwitterion is presented which includes an esterification reaction of the pendant hydroxylic groups. [ABSTRACT FROM AUTHOR]

Copolymers of 2-ethyl-2-oxazoline (ETOX) and N-phenylmaleimide(PhMI) without initiator were prepared at different feed mole ratios, solvents, temperatures and times. The copolymers are almost statistical and rich in N-phenylmaleimide. The copolymer composition was determined by H NMR. [ABSTRACT FROM AUTHOR]

Copolymers of 2-ethyl-2-oxazoline (ETOX) and succinic anhydride (SAN) in the absence of an added initiator were synthesized at 60 °C in acetoni - trile and in bulk. The statistical copolymers are rich in ETOX, and they are partially hydrolyzed by loss of the pendant group CHCHCO. Copolymer compositions and hydrolysis degree were determined by H-NMR spectroscopy. [ABSTRACT FROM AUTHOR]

Copolymers of 2-methyl-2-oxazoline, N-acetylaziridine (structural isomers) and maleic anhydride were synthesized in acetonitrile in the absence of initiator. The copolymers are insoluble in solvents such as DMF, acetone, methanol, pyridine, DMSO, etc. The copolymer composition depends on the initial ratio and it was determined by elemental analysis. [ABSTRACT FROM AUTHOR]

Copolymers of 2-methyl-2-oxazoline and phtalic anhydride without initiator were prepared at 60°C in DMF, CHCN and in bulk. The copolymers were statistical rich in 2-methyl-2-oxazoline and the -COCH groups are partially hydrolized. The composition and the degree of hydrolysis of the copolymers were determined by H-NMR. C-NMR proved that the hydrolisis did not occur during the polymerization process. A scheme of copolymerization via zwitterion is presented. [ABSTRACT FROM AUTHOR]