Fourier transform infrared study of uniaxially oriented atactic polystyrene

Abstract

Infrared measurements of the dichroic ratio of atactic polystyrene absorption bands provide a valuable method of determination of the overall orientation of chains as well as the particular orientation of the trans conformational segments. The orientation process produces the alignment of the chains as well as an increase in the amount of trans conformational segments. A linear relationship is observed between birefringence and dichroic ratio for the absorption bands characteristic of overall orientation. A value of 35° ± 3° is obtained for the angle between the normal to the plane of the benzene ring and the chain axis from both infrared and birefringence determinations.

Orientation analysis of uniaxially drawn polystyrene films doped with fluorescent molecules by fluorescence polarization, UV-and IR-dichroism and birefringence

“…The most probable value of the anw between the transition moment of the 2850 cm-band and the chain axis is a2850 = 70 ~ which is consistent with Ano = -0.10 and a906 = 38 ~ [7]. In fact, the second value a2sso = 90 ~ [8] would imply that for the conformations of all chain segments the transition moment would be exactly orthogonal to the chain axis, and this fact seems to be rather improbable for atactic polystyrene.…”

Orientation in uniaxially drawn polystyrene plasticized by CO2 sorption

“…The a value for the vibration was reported to be 35". 18 Figure 1 ( a ) shows the CO, pressure dependence of f for PS films with c = 0.0079 spl and X = 4 at the temperatures of 308. 15 Figure 1 ( b ) .…”

Mechanism of generation of birefringence in poly(methyl methacrylate/styrene)

“…[12][13][14] The measurement was carried out at room temperature (25 1C), which is 60-80 1C lower than T g . The experimental equipment is described in Figure 3a.…”