The dynamic mechanical properties of nylons

Abstract

AbstractA study of the dynamic mechanical properties of a series of polyamide polymers and some related polymers has been made over a wide temperature range at about 100 cycles/sec. by means of a vibrating reed method. The character of the β dispersion of the polyamides occurring at about −40°C. is discussed in relation to the chemical structure of the polymers particularly to the amide groups. It is shown that the β dispersion of the linear condensation polymers of this type is influenced by the properties of the polar groups in the molecular chains. The data supports the view recently postulated by Woodward and his co‐workers that the β peak in the polyamides is due to a segmental motion involving nonhydrogen‐bonded amide groups. Finally the correlation between the γ process occurring at about −120°C. and molecular structure is discussed.