ISSN:
0022-3832
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
An alternating copolyurea was prepared by the interfacial polycondensation of 1,4-piperazinedicarbonyl chloride with hexamethylenediamine. Comparison of this alternating copolyurea with the corresponding copolyurea having a random distribution showed that the alternating copolymer had a higher melting point, greater crystallinity, and was somewhat less soluble than the random copolymer. A series of copolyamideurethanes was prepared by the interfacial polycondensation of 2,5-dimethylpiperazine with terephthaloyl chloride and ethylene bis(chloroformate), various modes of addition of the two diacid chlorides being used. The degree of order developed in these copolyamide-urethanes was postulated from the probable mechanism of the reaction. The directional “crystallinity” or lattice order of the copolymers, as determined from x-ray diffraction patterns, was cited to support these postulated structures.
Additional Material:
2 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pol.1959.1204013711
Permalink