Title: Kinetic behaviour of graft copolymerisation of nitrogenous heterocyclic monomer onto EB-irradiated ETFE films Author:Sithambaranathan, Paveswari; Nasef, Mohamed; Ahmad, Arshad Subject:Kinetic investigation ; Radiation induced graft copolymerisation ; 4-Vinyl pyridine ; ETFE film Description:
Kinetic behaviour of graft copolymerisation of a nitrogenous heterocyclic monomer, 4-vinylpyridine (4-VP), onto electron beam irradiated poly(ethylene-co-tetrafluoroethylene) (ETFE) films was investigated in correlation with reaction parameters (absorbed dose, monomer concentration and reaction temperature). This was established by determination of initial polymerisation rate ( r p0 ), characteristic radical recombination rate (γ) and delay time ( t 0 ). The orders of the dependence of the initial rate of grafting on the absorbed dose and monomer concentration were found to be 2.28 and 3.49, respectively. The effect of temperature was investigated in the range of 50–70 °C and the activation energy was determined. The incorporation of poly(4-VP) grafts and the accompanied chemical changes in the grafted ETFE films were monitored using Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy, respectively. The results of the present study showed that a quantitative kinetic description for grafting of 4-VP onto ETFE can be established and the degree of grafting can be tuned by controlling the reaction parameters.
Is part of:
Journal of Radioanalytical and Nuclear Chemistry, 2015, Vol.304(3), pp.1225-1234
0236-5731 (ISSN); 1588-2780 (E-ISSN); 10.1007/s10967-015-3927-6 (DOI)
Title: Kinetic investigations of emulsion- and solvent-mediated radiation induced graft copolymerization of glycidyl methacrylate onto nylon-6 fibres Author:Ting, Teo; Nasef, Mohamed; Sithambaranathan, Paveswari Subject:High energy radiation ; Grafting in emulsion ; Grafting in solvents ; Glycidyl methacrylate ; Nylon-6 fibres Description:
Kinetic behaviour of graft copolymerisation of glycidyl methacrylate onto nylon-6 fibres in solvent- and emulsion- media was investigated. The order for the dependence of the initial rate of grafting on the monomer concentration for solvent and emulsion grafting systems were found to be 1.65 and 1.57, respectively. The order of dependence of the initial rate of grafting on the absorbed dose was found to be 1.55 for solvent and 0.62 emulsion grafting systems. The results showed that grafting in both systems is controlled by diffusion mechanism and the degree of grafting can be effectively tuned by variation of the grafting parameters.
Is part of:
Journal of Radioanalytical and Nuclear Chemistry, 2017, Vol.311(1), pp.843-857
0236-5731 (ISSN); 1588-2780 (E-ISSN); 10.1007/s10967-016-5100-2 (DOI)