Table 1. Analysis of Polarized FTIR Spectra of Random and Aligned Fibers^a.

		random fibers			aligned fibers
wavenumbers (cm–1)	approximate normal modes assignment	estimated dichroic ratio R	estimated α intervals	fm	estimated dichroic ratio R	estimated α intervals	fm
845	νs(CF2)+νs(CC) [45]	1.10	0° ≤ α ≤ 53.41°	0.03	1.06	0° ≤ α ≤ 53.88°	0.02
882	ρ(CH2)+νas(CF2)+ρ(CF2) [45]	1.10	0° ≤ α ≤ 53.46°	0.03	1.01	0° ≤ α ≤ 54.51°	0.006
944	-t(CH2)-νas(CF2) [43]	1.22	0° ≤ α ≤ 52.03°	0.06	0.24	72.29° ≤ α ≤ 90°	0.72
1076	νas(CC)+w(CH2)+w(CF2) [45]	2.48	0° ≤ α ≤ 41.94°	0.33	-	-	-
1121	νs(CC)+νas(CC) [43]	1.27	0° ≤ α ≤ 51.40°	0.07	1.76	0° ≤ α ≤ 46.80°	0.20
1185	νas(CF2)+ρ(CF2)+ρ(CH2) [45]	1.09	0° ≤ α ≤ 53.57°	0.03	0.83	57.15° ≤ α ≤ 90°	0.11
1245	νas(CF2) [41]	1.27	0° ≤ α ≤ 51.46°	0.08	2.02	0° ≤ α ≤ 44.82°	0.25
1284	νs(CF2)+νs(CC)+δ(CCC) [45]	0.97	55.09° ≤ α ≤ 90°	0.01	0.34	55.09°≤α≤90°	0.56
1341	head-to-head and tail-to-tail linkages [41]	1.43	0° ≤ α ≤ 49.79°	0.12	0.72	67.53° ≤ α ≤ 90°	0.20
1398	w(CH2)+νs(CC) [45]	1.44	0° ≤ α ≤ 49.63°	0.12	4.55	0° ≤ α ≤ 33.54°	0.54
1428	δ(CH2)-w(CH2) [45]	1.14	0° ≤ α ≤ 52.95°	0.04	0.05	80.94° ≤ α ≤ 90°	0.92

^aThe symbol indicate ν_s, symmetric stretching; ν_as, antisymmetric stretching; δ, bending; ρ, rocking; t, twisting; w, wagging. The sign ± indicates in-phase and out-of-phase vibration