Grafting vinyl monomers onto polyester fibers. VI. Graft copolymerization of methyl methacrylate onto PET fibers using tetravalent cerium as initiator

Abstract

SynopsisThe graft copolymerization of methyl methacrylate onto polyester fibers (PET) was investigated using tetravalent cerium as the initiator. The rate of grafting was found to increase progressively with the initiator and monomer concentrations up to 2.5 X 10-2M and 70.41 X 10-2M, respectively. The reaction was found to be catalysed by acid up to 15.0 X 10-2M. The graft yield increased by increasing temperature. The effect of addition of some solvents and thiourea on the rate of grafting was also investigated. A suitable kinetic scheme has been pictured, and rate equations have been derived.

Preparation of an adsorbent by graft polymerization of acrylamide onto coconut husk for mercury(II) removal from aqueous solution and chloralkali industry wastewater

“…It was previously shown that the phenolic hydroxyl group of lignin accelerates the decomposition of H 2 O 2 and the graft copolymerization of lignocellulose when Fe 2+ ions are present in the system 5. Although much work on grafting of vinyl monomers onto wool,6 cotton,7 silk,8 and fibers9 has been reported, work on coconut husk has not been reported. The first part of the present research work deals with studies of the optimum conditions of grafting acrylamide onto coconut husk using the Fe 2+ —H 2 O 2 redox system.…”

Preparation of an adsorbent by graft polymerization of acrylamide onto coconut husk for mercury(II) removal from aqueous solution and chloralkali industry wastewater

“…This may be due to the enhanced rate of termination which balances the rate of propagation. 8 The graft yield increased with increase of the monomer concentration as shown in Figure 4. The enhancement of grafting by increasing the monomer concentration could be associ- ated with the gel effect, 9 resulting from an enhanced solubility of polyacrylamide in its own monomer.…”

“…It was previously shown that the phenolic hydroxyl group of lignin accelerates the decomposition of H 2 O 2 and the graft copolymerization of lignocellulose when Fe 2ϩ ions are present in the system. 5 Although much work on grafting of vinyl monomers onto wool, 6 cotton, 7 silk, 8 and fibers 9 has been reported, work on coconut husk has not been reported. The first part of the present research work deals with studies of the optimum conditions of grafting acrylamide onto coconut husk using the Fe 2ϩ -H 2 O 2 redox system.…”

Graft Polymerization of Polyacrylonitrile or Poly(methyl methacrylate) onto Polyurethane for the Improvement of Mechanical Properties and Water Vapor Permeability

“…PMMA has broad applications including window panel, green house, automobile light cover, skylight, monitor screen, solar cell cover, surgical bone cement, dental cavity filling, and illuminated signage. However, the graft polymerization of PAN and PMMA onto PU has been scarcely reported, and it is worth to explore the properties of PUs grafted with PAN or PMMA in this investigation . PAN or PMMA chains were grown from the active sites on PU (graft‐from approach), and the number of PAN or PMMA chains was varied.…”

“…However, the graft polymerization of PAN and PMMA onto PU has been scarcely reported, and it is worth to explore the properties of PUs grafted with PAN or PMMA in this investigation. 18,19 PAN or PMMA chains were grown from the active sites on PU (graft-from approach), and the number of PAN or PMMA chains was varied. This PU surface grafting method has been reported in the literature [20][21][22][23][24] and was previously demonstrated in developing functionalized PUs; e.g., PUs that exhibited flexibility at low temperatures, 25 electric attraction in aqueous solutions, 26 pH sensitivity, 27 and low temperature flexibility 28 were successfully developed.…”