Chemical/photochemical functionalization of polyethylene terephthalate fabric: effects on mechanical properties and bonding to nitrile rubber

Abstract

The aim of this work is to compare the effects of chemical and photochemical functionalization on the mechanical properties of PET fabric and its adhesion to nitrile rubber (NBR). The photochemical functionalization was performed by UV irradiation of PET fabric in the presence of glutaric acid peroxide at a temperature of 60 °C for different exposure times (i.e. 60, 90 and 120 min). The chemical functionalization (i.e. hydrolysis) of PET fabrics was performed by NaOH solution at a temperature of 60 °C for different times (i.e. 60, 120, 240 and 360 min). The tensile properties of the functionalized fibers were also evaluated. The functionalized PETs were evaluated for H-pull and T-peel adhesion to NBR. It was found that both treatment methods created functional groups on the PET surface. However, carboxylation of PET under GAP/UV irradiation generated much more OH groups on the PET surface (i.e. 4.5 times). The hydrolysis of PET in NaOH solution for more than 60 min caused a significant decrement in the tensile strength contrary to carboxylation under GAP/UV irradiation. It was also found that pullout and T-peel adhesions to NBR decreased in the case of hydrolysis of PET while they increased about 33 and 12% for GAP/UV irradiated PET, respectively.

Ionic liquids adsorption and interfacial tension reduction for synthetic resinous and asphaltenic oils: salinity and pH effects

“…In light of these limitations, the researchers proposed several solutions to overcome such limitations such as using a combination of surfactants with other chemicals such as alkali and polymer as the common combinations. As previously mentioned, alkalis are responsible for further IFT reduction in the presence of conventional surfactants under the saponification process leading to the formation of in-situ surfactants which is the consequence of alkali and the naphthenic acids reactions 35 , 36 .…”

Solubility of lumiracoxib in supercritical carbon dioxide

“…In general, micronizing the drug particles enhances the dissolution rate since the available surface area to the dissolving medium increases. Respecting this fact, extensive researches were performed on the micronization methods to find suitable methods without manipulating the physiochemical properties of the drug particles 1 – 7 . Among the possible micronization methods, supercritical fluid technologies (SFT) especially those that use supercritical carbon dioxide (SC-CO 2 ) as the main solvent gain increasing attention for producing nano and micron-size particles with controlled morphology 8 .…”