Thermal and optical studies on unirradiated and γ-irradiated polyester track detector

Abstract

Thermal and optical properties of unirradiated and C-irradiated polyester track detector films in the dose range of 0-14.5 Mrad have been studied by thermogravimetry (TG) and UV-Visible spectroscopic technique. The samples were irradiated with 60 Co C-rays for doses of 4.7, 8.1 and 14.5 Mrad. The TG studies indicate that unirradiated and the C-irradiated samples degrade in two steps. The kinetics of the two steps of degradation were also evaluated from the TG curves. Irradiation enhances the degradation rate and the effect increases further with increasing radiation dose. The optical band gaps of the unirradiated as well as the irradiated samples were also determined from the UV-Visible spectra. These studies can be used for the estimation of C-dose using changes in absorbance and the activation energy due to C -irradiation.

Lactoferrin-Immobilized Surfaces onto Functionalized PLA Assisted by the Gamma-Rays and Nitrogen Plasma to Create Materials with Multifunctional Properties

“…These radical positions can be involved in a different reaction: oxidation, by the formation of peroxyl structures, or grafting of other type of molecules . The degradation of the polymer is evidenced by reduction in molecular weight and activation energy of thermal degradation. , …”

“…21 The degradation of the polymer is evidenced by reduction in molecular weight and activation energy of thermal degradation. 22,23 The tremendous radiochemical features of PLA are offered by its high susceptibility to form free radicals, which further interact with other molecules. The polymer blends of PLA with collagen, 24 polyethylene, 25 or poly(vinyl acetate-co-vinyl alcohol) 26 can be compatibilized by the bonding of PLA radicals on the backbones of the second component by using gamma irradiation.…”