Determination of radial structural properties and spectral dispersion curves of poly(aryl ether ether ketone) fibre

Abstract

Poly(aryl ether ether ketone) (PEEK) fibre was studied using a variable wavelength interferometric technique (VAWI). This technique was used in conjunction with a Pluta polarizing interference microscope to determine the spectral dispersion curves of fibre refractive indices and birefringence fibre. The results were used to calculate the dispersion properties of the fibre, ie dispersion and oscillation energies, Cauchy's constants of dispersion relation and the natural wavelength of the fibre. The radial refractive index and birefringence profiles were also determined, taking into consideration the refraction of light beam by the fibre, and some radial structural profiles were then calculated using a ring-zonal model. The measurements of these radial profiles are required for optimizing the spinning and processing of manufactured textile fibres. The Fraunhofer diffraction pattern of a He-Ne laser beam was used to determine the average thickness of the fibre. Microinterferograms are presented for illustration.

Determining the opto-mechanical and geometrical properties of high-density polyethylene fibres

“…They also described a method to detect the variation of the refractive index profile, transverse sectional shapes, areas and mechanical properties of fibres during the cold drawing process [6]. El-Bakary [11][12][13] used two-beam polarizing interference microscope to detect the effect of different treatments on the optical properties of polymer fibres.…”

Interferometric investigation of the opto‐mechanical and structural properties of iPP/TiO2 nanocomposite fibers

“…The drawn (oriented) fibers reveal the transverse birefringence gradients in optical anisotropy when both refractive indices ( n || and n ┴ ) are measured at the marginal and central zones of the fiber. Measurements of the refractive index and birefringence profiles are considered to be one of the interesting properties suggested as a quality control during the manufacturing of textile fibers (El‐Bakary, , ). The drawing process of fibers provides optimal alignment of the molecular chain along the fiber axis.…”

Interferometric determination of the refractive indices and birefringence of some highly oriented fibres

“…The measurement of birefringence is a useful tool for studying the structural orientation, which is the average of the amorphous and crystalline region [4] in highly oriented fibres. The spectral dispersion curves of the refractive indices and birefringence are studied [5][6][7][8] for many types of fibres to investigate the structure behaviour of these fibres.…”