Photoplastic effect in polycarbonate using tensile deformation

Abstract

ABSTRACT:The studies on photoplastic effect of polycarbonate has helped significantly in understanding the elastoplastic behavior of polycarbonate. When a plastically deformed specimen (polcarbonate) is suddenly illuminated with light of proper wavelength, a decrease in flow stress is observed, deformation leads to the softening, of specimen, i.e., to the negative photoplastic effect obtained at room temperature. On switching off, deformation stress reaches its level in the dark. The studies on the negative photoplastic effect mechanism can offer ways to control the properties of photoelectronic devices.

Graft copolymerization of acrylamide onto tamarind kernel powder in the presence of ceric ion

“…The higher the concentration of Ce (IV), the greater will be the termination of growing grafted chains resulting in reduction of %G as well as %GE. 13,19,20,[29][30][31] Effect of nitric acid concentration…”

“…Further with an increase in the reaction time, mutual annihilation of growing grafted chains also occurs leading to a decrease in %G and %GE. 13,19,20,36 Effect of temperature The grafting reactions were carried out at different temperatures (20-408C), keeping other variables constant. The effect of temperature on %G and %GE is shown in Figure 6.…”

“…Similar results have been reported in the literature. 13,19,20,29,37 CONCLUSION Graft copolymerization of AA onto TKP in aqueous medium can be initiated effectively with CAN. The optimum reaction conditions obtained for grafting of AA onto TKP by using: [TKP] 0.019 mol; [CAN] 0.035 mol; [AA] 0.099 mol; [HNO 3 ] 0.2N; reaction time 2 h; reaction temperature 308C, and total reaction volume 100 mL.…”

“…In our laboratory, seed gums (Cassia tora/Cyamopsis tetragonoloba/TKP) were modified via carboxymethylation, 14,15 carbamoylethylation, 16,17 cyanoethylation, 18 and grafting. 13,19,20 Interestingly, there is no work reported on the graft copolymerization of AA onto TKP in the presence of CAN as redox initiator. Therefore, reaction conditions for graft copolymerization of AA onto TKP were optimized with a view that grafted TKP may find better applications in comparison with native TKP.…”