Analysis of microstress in neutron irradiated polyester fibre by X-ray diffraction technique

Abstract

Abstract. Microstresses developed in the crystallites of polymeric material due to irradiation of high-energy particle causes peak broadening and shifting of X-ray diffraction lines to lower angle. Neutron irradiation significantly changes the material properties by displacement of lattice atoms and the generation of helium and hydrogen by nuclear transmutation. Another important aspect of neutron irradiation is that the fast neutron can produce dense ionization at deep levels in the materials. The polyethylene terephthalate (PET) fibre of raw denier value, 78⋅ ⋅2, were irradiated by fast neutron of energy, 4⋅ ⋅44 MeV, at different fluences ranging from 1 × × 10 9 n/cm 2 to 1 × × 10 12 n/cm 2 . In the present work, the radiation heating microstresses developed in PET micro-crystallites was investigated applying X'Pert-MPD Philips Analytical X-ray diffractometer and the effects of microstresses in tensile strength of fibre measured by Instron have also been reported. The shift of 0⋅ ⋅45 cm -1 in the Raman peak position of 1614⋅ ⋅65 cm -1 to a higher value confirmed the development of microstresses due to neutron irradiation using micro-Raman technique. The defects due to irradiation were observed by SEM micrographs of single fibre for virgin and all irradiated samples.

Microstructural analysis of neutron-irradiation induced changes in polyester fibre studied using EPMA

“…Moreover, the micrograph at 3000 X magnifications clearly shows that there is no preferred orientation of the polymer in any direction confirming the isotropic nature of the sample. This was also confirmed in an earlier study using X-ray diffraction, SEM and Micro-Raman techniques [13,16].…”

“…Again, PET fibres are mainly used in textile industry [2,3]. Apart from that, it is also used in the field of surgical polymeric textiles [4,5], composites [6,7], nanocomposites [8], conducting polymer [9], electroactive polymer [10] etc. Polyesters are mainly cross-linked when irradiated.…”

“…), electrical, thermal and chemical properties. Neutron irradiation [11][12][13] significantly changes the properties of polymeric materials by the displacement of lattice atoms and the generation of helium and hydrogen by nuclear transmutation.…”

Surface and Bulk Modification of Synthetic Textiles to Improve Dyeability

“…Mallick et al considered the shift in some of the Raman peak positions to a higher value with the development of micro-stresses due to neutron irradiation of synthetic fibers. The defects due to irradiation were confirmed by SEM micrographs of virgin and irradiated fibers (Mallick et al, 2005).…”

Influence of laser irradiation on the optical and structural properties of poly(ethylene terephthalate) fibres

“…These changes in the lattice planes are sensitive to the X-ray diffraction methods, provided that variations in the scatter peaks are properly identifiable. As described by Mallick et al [16] strain can be verified by differentiating the Bragg's law:…”