ISSN:
0021-8995
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Different values are reported in the literature for the intrinsic birefringence of the crystalline (Δn0c) and the amorphous (Δn0a) phases in nylon 6. Mostly, these values have either been determined by extrapolation (and then it is assumed that Δn0c = Δn0a) or calculated theoretically. In this study, intrinsic birefringence values Δn0c and Δn0a for nylon 6 were determined using the Samuels two-phase model which correlates sonic modulus with structural parameters. Three series of fiber samples were used: (1) isotropic samples of different degrees of crystallinity for estimation of E0t,a and E0t,c moduli at two temperatures. The following modulus values were obtained: 1.62 × 109 and 6.66 × 109 N/m2 for 28.5°C, and 1.81 × 109 and 6.71 × 109 N/m2 for -20°C; (2) anisotropic, amorphous fiber samples for estimation of Δn0a = 0.076 and E0t,a = 1.63 × 109 N/m2 at 28.5°C; (3) semicrystalline samples of various draw ratios for estimations of Δn0c = 0.089 and Δn0a = 0.078. All measurements were carried out with carefully dried samples to avoid erroneous results caused by moisture.
Additional Material:
4 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/app.1981.070260807
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