Authors: Ismail Karacan Gülçin Baysal
Publish Date: 2012/09/30
Volume: 13, Issue: 7, Pages: 864-873
Abstract
An investigation on the role of cupric Cu2+ ion incorporation during the thermal stabilization of polyamide 6 fibers was carried out using a combination of differential scanning calorimetry DSC thermogravimetric analysis TGA and Xray diffraction XRD measurements Cupric chloride pretreated and thermally stabilized polyamide 6 PA6 fibers was characterized by a reduction in fiber diameter and linear density values together with color changes from light brown to black with increasing stabilization time PA6 fibers were properly stabilized after 8 h of stabilization time prior to carbonization The results obtained from DSC and TGA measurements indicated that there was an improvement in the thermal stability when cupric Cu2+ ions were incorporated into the polymer structure TGA thermograms showed the relative improvement in thermal stability as indicated by increasing char yield with progressing time Char yield reached a maximum value of 336 at 1000 °C for the cupric chloride pretreated PA6 fibers stabilized for 12 h at 180 °C Experimental results obtained from DSC and Xray diffraction methods suggested the loss of crystallinity as a result of perturbation of hydrogen bonds with progressing time The formation of cupric ionamide coordination bonds improved the thermal stabilization by encouraging the development of ladderlike structures The investigation resulted in a new method of evaluation of Xray stabilization index specifically intended for the thermally stabilized PA6 fiber
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