Abstract
Polarized infrared (IR) spectroscopy has been used to determine the crystalline and amorphous orientation of polyamide fibers. The transition moment angle of the band at 936 cm<sup>−1</sup> of PA66 was determined to be 48° using IR spectroscopy and birefringence measurement. The crystalline orientation of PA66 fibers was estimated from the band at 936 cm<sup>−1</sup> while the amorphous orientation of PA66 fibers was obtained by an indirect method. The α crystalline orientation of PA6 has been obtained using the band at 930 cm<sup>−1</sup> and the amorphous orientation of PA6 has been determined using the band at 1124 cm<sup>−1</sup>. Crystalline orientation increased rapidly at low draw ratios (DR < 3) and increased slowly at higher draw ratios (DR > 3) for both PA66 and PA6 fibers, while the amorphous orientation increased slowly throughout the whole extension range for PA66 fibers. A good correlation was found between the crystalline orientation values obtained by infrared spectroscopy and other methods such as X-ray diffraction for PA66 and PA6 fibers. On the basis of this observation, it has been concluded that polarized infrared spectroscopy can be used reliably to measure the orientation of polyamide fibers without combining with other techniques.
PDF Article
More Like This
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription