Effect of gamma radiation on the structural, thermal and optical properties of PMMA/Sn_0.75Fe_0.25S₂ nanocomposite

Abstract

Nanocomposite films of polymethylmethacrylate PMMA with Sn0.75Fe0.25S2 nanoparticles (NPs) were fabricated by both thermolysis and casting techniques. Changes in PMMA/Sn0.75Fe0.25S2 nanocomposite (NCP) due to gamma irradiation have been measured. XRD results indicate that the gamma doses of 10–80 kGy cause intermolecular crosslinking that reduces the ordered portion in the NPs. Bonding between the NPs and the host PMMA was confirmed by FTIR. TGA results indicate an enhancement in thermal stability in the NCP films irradiated with doses 20–80 kGy. The optical band gap was reduced from 3.23 to 2.47 eV upon gamma irradiation up to 80 kGy due bonding between the NPs and PMMA which enhanced the amorphous part of the NPs. Finally, the color variation between the blank and irradiated films (ΔE) was determined. Color changes immensely when the PMMA/Sn0.75Fe0.25S2 NCP films are gamma irradiated. Values of ΔE were as much as 31.6 which is an acceptable match in commercial reproduction on printing presses.

Optical characterization of gamma irradiated Bayfol DPF 5023 nuclear track detector

“…The author computed the color factors using the transmission records in the wavelength range from 370 to780 nm (Figure 5). The tristimulus values were measured and presented in Figure (6) versus  dose. Their values decreased on raising the  dose up to 50 kGy.…”

“…The transesterification reaction was postulated to be the greatest significant one that arises among PC and Ps, resulting in a novel construction of copolymers with novel IR function groups [4,5]. These copolymers possess the brilliant effect durability, great thermal and mechanical characters, and the excellent dimensional stability of both PC and Ps [6].…”

“…Additionally,  irradiation breaks down the polymer chains producing biochemically active free radicals that act to form newly covalent bonds causing chains crosslinks, consequently the polymer properties are changed [7]. Besides, the  irradiation induces lattice defects, altering the polymer character [6]. The characterization of optical properties of irradiated polymers is extensively used in optoelectronic apparatuses [8].…”

Plasma Impact on the Structural and Optical Properties of Polycarbonate/Polyester Blend

“…Figure (7) demonstrates how the refractive index varies as the time interval of plasma exposure rises. The index of refraction is increasing on growing the exposure time up to 3 minutes.…”

“…The polymer characteristics are altered due to the breakdown of the polymeric chains caused by plasma irradiation, and the creation of biochemically active free radicals that serve to generate novel covalent bonds resulting in chains crosslinks [6]. Additionally, the  irradiation causes lattice flaws, changing the characteristics of the polymer [7].…”