Radiation-induced morphological changes in polyamide fibers

Post-irradiation effects on gamma-irradiated nylon 6,12 fibers

“…The fusion temperatures were obtained in the second heating process (samples were first heated to avoid thermal history effects) to provide melting point ( Figure 5 and heat of fusion ( Figure 6) parameters. For the FI samples, an increase in the melting point for the low radiation doses, ranging between 15 kGy and 50 kGy, is observed [14], with respect to the melting point of the NI sample, followed by a decreasing trend from 100 kGy to 300 kGy; this again makes evident the partial and permanent damage processes occurring because of the radiation applied. Based on the melting temperature behavior, it could be said that a low dose induces reinforcement due to the crosslinking because of the increase in temperature, and at a higher dose, chain scission, crosslinking and reinforcement processes are in competition; however, at the end, degradation is the dominant mechanism.…”

“…By contrast, there is great interest in studying the radiation stability of polymers [2], as well as the change in chemical, mechanical and physical properties [3], aiming for future applications [4][5][6][7]. However, relatively few reports have been published on the effect of gamma radiation on nylons: mechanical properties [8], melting point decrease [9,10], degree of crystallinity [11][12][13], surface modification [14,15] and additional polymerization [9]. Moreover, there is controversy about the mechanism followed by the gamma-irradiated polymers.…”

Adsorption of Fe(NO3)3onto Activated Nylon-6,6 as a Container and a Possible “Smart” Corrosion Inhibitor-containing System

“…Thus, nylon-6,6 samples in the form of pellets and thin solid flat samples were irradiated with a Transelektro research irradiator, employing a 60 Co activity of 2911 Ci at a dose rate of 2233.7 Gy/h from which the necessary exposure time was calculated. The details of the procedure employed have been reported elsewhere (Menchaca et al 2002).…”

In situ high-temperature Raman study of crystalline nylon 6,12 fibers gamma-irradiated in argon atmosphere

“…Gamma radiation is one of the techniques employed for nylon fibers modification and recrystallization [6,7]. Few reports about the effect of gamma radiation on Nylons have been found [6][7][8], and relatively few reports have been published on characterization of nylon with Raman spectroscopy [9][10][11]. The application of the Raman technique to this kind of polymers has proved to be pretty convenient in terms of acquisition times, no fluorescence interference, very good quality of the spectra obtained, working in solid state and easiness in handling the sample.…”

“…On the other hand, there is a great interest in studying the radiation stability of polymers or the change in chemical, mechanical and physical properties in the context of future applications. Gamma radiation is one of the techniques employed for nylon fibers modification and recrystallization [6,7]. Few reports about the effect of gamma radiation on Nylons have been found [6][7][8], and relatively few reports have been published on characterization of nylon with Raman spectroscopy [9][10][11].…”