Nylon 6,6 copolyamides of bis(2‐carboxyethyl) methylphosphine oxide

摘要

AbstractCopolyamides of nylon 6,6 withbis(2‐carboxyethyl)methylphosphine oxide (CEMPO) were prepared by melt polycondensation of nylon 6,6 salt with CEMPO and hexamethylene diamine. The effect of CEMPO upon melting point, moisture regain, boiling water shrinkage, water wicking, tensile properties, thermal stability, static dissipation, and flammability of nylon 6,6 fibers and fabrics was determined. The fiber properties were greatly affected by the high water absorption and solubility characteristics of the phosphine oxide linkage. However, crystallinity and orientation were not greatly disturbed by up to 30–40M CEMPO substitution in nylon 6,6. The copolyamides were of improved flame resistance compared to nylon 6,6 and were also found to give improved flame resistance in blends of the copolymer with various commercial plastics. In addition, CEMPO and the corresponding diamine,bis(3‐aminopropyl)methylphosphine oxide were used to prepare a series of cycloaliphatic and aromatic ring‐containing polyamides, but problems were encountered with moisture sensitivity and low melting points with some of these p