Abstract
Amination of vinylbenzyl chloride-divinylbenzene (VBC-DVB) copolymers is an effective method for preparation of anion-exchange resins. Conventionally, the starting polymer is produced by chloromethylation of a styrene–divinylbenzene copolymer that utilizes chloromethyl methyl ether, a known carcinogen. An alterative approach is to copolymerize vinylbenzyl chloride with divinylbenzene to generate the necessary VBC-DVB. This method provides precise control over the density of the ion-exchange groups. The regiochemistry of the vinylbenzyl chloride methods was realized using solvent-ion exchange groups. These resulting anion-exchange polymers were characterized by a variety of techniques such as analytical titrations, transform infrared spectroscopy and thermal gravimetric analysis. Testing of these copolymers for breakthrough was performed. The results indicate that these anion exchangers have a meaningful increase in thermal stability over commercial anionic exchange beads. Resins containing MWCNTs achieved anion exchange capacity value of 323.6 meq/100 g over than that of copolymer resins and that useful in water desalination or treatment.
Highlights
Ion-exchange resins are polymers that are capable of exchanging particular ions within the polymer with ions in a solution that is passed through them
The results indicate that these anion exchangers have a meaningful increase in thermal stability over commercial anionic exchange beads
The organic compounds consisted of styrene, divinylbenzene, multi-walled carbon nanotubes (MWCNTs), toluene, Benzoyl peroxide (BPO) and SDS
Summary
Ion-exchange resins are polymers that are capable of exchanging particular ions within the polymer with ions in a solution that is passed through them. There has been considerable interest on CNTs (Carbon Nanotubes) since their discovery in 1991 because CNTs have remarkable mechanical, electrical and thermal properties. The structure, high aspect ratio, and chemical bonding properties of carbon nano tubes were combined to produce a material with electro-mechanical properties that can be exploited in polymer composites and a variety of light-weight, high-strength structural materials (Li 1998; Menger et al 1990; Sasthav et al 1992). Many technological applications, including field emission display, diodes and transistors, sensors, actuators, fillers in composites materials and hydrogen storage have already been proposed and some of them were demonstrated. CNTs are of great interest due to their potential applications in different fields of science and technology; they offer a combination of mechanical, electrical, and thermal properties that no other material has displayed before
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