ISSN:
0360-6376
Keywords:
Physics
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
High-molecular-weight polyamides containing p-benzamide units can be obtained by polycondensation of monomers having preformed amide linkages in N-methylpyrrolidone with added CaCl2 and LiCl in the presence of pyridine and triphenylphosphite (the conditions used by Higashi et al.). For example, the polyterephthalamide of 4,4′-diaminobenzanilide having ηinh = 5.4 was obtained. Similarly, polycondensation of p-phenylenediamine with N,N′-bis(p-carboxyhenyl)terephalamide produced a polymer having ηinh = 5.15. These results constitute the first demonstration that the phosphorylation reaction can be used to prepare rodlike polymers containing p-benzamide units of molecular weights adequate for commercial-quality fibers. Polymerization of p-aminobenzoic acid using either Yamazaki or Higashi conditions does not lead to a polyamide having a high inherent viscosity. Block copolyamides having rigid and semiflexible blocks were prepared by using both Yamazaki and Higashi conditions. Block copolymers composed of p- and m-benzamide units, and having ηinh = 3.0-3.1, were synthesized by using a rigid prepolymer obtained by applying the Yamazaki reaction to a monomer containing a preformed amide linkage, 4-N-(4′-aminobenzamido)-benzoic acid. Use of monomers having preformed amide linkages with Higashi conditions afforded block copolymers having inherent viscosities of up to 4.75.
Additional Material:
4 Tab.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pol.1982.170201119
