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Preparation and characterization of polyureas from divalent metal (Ba, Sr, Pb, Zn) salts of sulfanilic acid
Author(s) -
Qiu Wulin,
Zeng Wenxiang,
Zhang Xuexian,
Li Can,
Lu Lude,
Wang Xin,
Yang Xujif,
Sanctuary Bryan C.
Publication year - 1993
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1993.070490305
Subject(s) - sulfanilic acid , metal , chemistry , polymer chemistry , thermal stability , aniline , divalent , sulfonic acid , inorganic chemistry , divalent metal , ionic bonding , nuclear chemistry , organic chemistry , ion
Metal‐containing polyureas containing ionic linkages in the main chain can be obtained by the polyaddition reactions of 2,4‐tolylene diisocyanate with mixtures of divalent metal salts of sulfanilic acid ( p ‐aniline sulfonic acid [ASA] ) and 4,4′‐diaminodiphenylmethane. Ba, Zn, Pb, and Sr were used as divalent metals, and their structures were characterized by 1 H‐NMR, 13 C‐NMR, and IR. The polyureas were obtained with ASA(M) up to 100% in feed diamines and they were all soluble in DMF and DMSO. The inherent viscosity of the polyureas decreased markedly with an increase in metal content. The thermal properties of these polyureas were also investigated by DSC and TG. It was found that introducing the metal into the polyurea increased the thermal stability. © 1993 John Wiley & Sons, Inc.