Teflon scrap based cation exchanger by radiation grafting: Process parameter standardization and characterization

Abstract

High-energy gamma radiation from 60 Co-gamma radiation source has been used to covalently link acrylic acid to teflon by mutual radiation grafting technique. Effect of various experimental parameters viz, dose, dose rate, monomer concentration, backbone thickness effect of additives on grafting extent was investigated in order to optimize the conditions for grafting acrylic acid onto teflon to optimum levels. The grafting extent decreased with increasing dose rate and thickness of the substrate while it increased with concentration of acrylic acid and optimum concentration of Mohr's salt. The grafted product was characterized for grafting yield, surface morphology, bulk morphology, and crystallinity change. The SEM studies indicate significant difference in bulk and interface due to change in thickness of the teflon backbone. Dynamic contact angle measurement studies of the grafted and radiation treated teflon showed that initial grafting as well as radiation treatment of teflon enhances its hydrophilicity.

Facile synthesis of amphoteric ion exchange membrane by radiation grafting of sodium styrene sulfonate andN,N-dimethylaminoethyl methacrylate for vanadium redox flow battery

“…Graft copolymerization is a widely used technique in polymer modification . As an alternative method to prepare IEMs for electrochemical application, radiation grafting technique has been widely used . The technique has showed obvious advantages that the composition and resultant properties of the membrane can be easily controlled by applying appropriate grafting conditions.…”

Development of Functional Adsorbent From Textile Cotton Waste by Radiation Induced Grafting Process: Equilibrium and Kinetic Studies of Acid Dye Adsorption

“…Radiation induced grafting has proven to be an easy and highly efficient process for incorporating desired chemical groups onto various existing polymer substrates Moreover, brush like cationic grafted polymer chains offer three-dimenensional spaces for adsorption of dye molecules resulting in the high adsorption capacity and fast adsorption kinetics (13,14,15). In the present work, the cotton cellulose based cationic adsorbent, synthesized by radiation induced grafting of PVBT, and its characterization has been reported.…”

Sorption of acid and basic dyes on radiation-grafted Teflon scrap: equilibrium and kinetic sorption studies

“…This can to some extent nullify the soil pollution which otherwise Teflon scrap causes due to its inertness. The surface modification of PTFE by grafting of vinyl monomer using electron beam [20], plasma [21], and gamma radiation [22,23] for certain advanced application have been reported recently.…”