Electronic and ionic conductivity in nylon 66

Abstract

SynopsisThe conductivity of dry poly(hexamethy1ene adipamide) (nylon 66) was measured as a function of time and temperature. Three temperature ranges were observed in which the time dependence of conductivity differed: (a) below 8OOC. the conductivity decreased continuously with time; ( b ) between 80°C. and 110'C. the conductivity remained constant over long periods; (c) above 120°C. a continuous decrease in conductivity was again observed. In other experiments the volume of gas evolved from the nylon film was measured under continuous potential and compared with the total current passed through the sample. It was observed that above 120°C. the gas evolved corresponded to about one-half the volume calculated if the conduction process involved only protons. Below 120°C. the gas evolved corresponded to an increasingly small fraction of the total current until below 90°C. no evolution of gas was observed. This suggests that at temperatures above 120°C. conduction involves the transport of both protons and electrons, whereas a t lower temperatures it is electronic. Mechanisms of conduction are discussed.

Electrical Conduction of Polypeptides as Related to Molecular Structure

“…In this case, the diffusion constant of deuterium can be estimated from the thickness of the film (about 3 micrometers) and the time constant of deuteration determined by infrared absorption. The relevant equation is 36 n=O (5) where D is the diffusion constant, d is the thickness of the film, and n is a non-negative integer. The diffusion constant of deuterium in the PMG film was estimated to be 9.5 x 10-15 cm 2 s-1 .…”

“…Ions supplied from residual impurities have also been considered a source of charge carriers. 9 · 10 PBG 2, CH2C6H 5 In previous papers/ 5 -17 it was shown that the conductivities of poly(y-methyl L-glutamate) (PMG) and nylon 12 were higher in the direction of the chain of hydrogen bonds than in other directions. We therefore consider that the electric conduction of these polymers depends mainly on the nature of hydrogen bonds and is modified by other factors.…”

“…Research on the electric conductivity of nylons and polypeptides has frequently been published.1 -17 The generally accepted view is that the conduction of these substances is partly ionic and partly electronic 5 -s and is caused by the transport of charge carriers through continuous chains of hydrogen bonds of the amide groups. Ions supplied from residual impurities have also been considered a source of charge carriers.…”

DC Electrical Study of Modified PMMA, PVC and their Blend

“…Such as Seanor [1,2] has reported that in nylon 6-6, above 120 8C, there is an ionic conduction while below and at least upto 80 8C it is electronic. In PVC, electronic conduction is reported by Flemming and Renicar [3] whereas Kosaki [4] favors hoping ionic mechanism.…”

Electric Field-Induced Gas Emission from PVDF Films

“…For nylon 66 films HZ emission corresponding to the electric field has been observed [3]. A related but more sensitive method, which discriminates the influence of the electric polarity, is used in the present paper to obtain inpulse generotor .…”