Some preliminary studies of the thermal behaviour of electron beam grafted polyamides

Timus, D.M.; Popov, Anton; Braşoveanu, Mirela; Babes, A.; Bradley, D.A.

doi:10.1016/s0969-8043(97)00166-8

Cited by 6 publications

(3 citation statements)

References 19 publications

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“…488 The thermal characteristics of synthetic polyamide are favourably modi¢ed by electron irradiation inducing grafting of acrylic acid, with melting disappearing for 25% grafted materials whose behaviour more closely resembles that of cellulosic materials rather than that of synthetics. 489 Radiation-induced graft polymerization of acrylic acid onto poly(tetra£uoroethylene^per£uorovinyl ether) copolymer ¢lms leads to a product which can be used as ligand in order to extract metal ions such as Rh 3 from waste solutions. 490 Graft copolymers consisting of polyethylene (PE) and dimethylaminoacrylamides have been prepared by direct grafting of the vinyl monomers to a PE ¢lm by mutual irradiation, and are promising in the design of polymeric liquid crystals.…”

Section: Copolymerization and Graftingmentioning

confidence: 99%

7 Radiation chemistry

Belloni

Delcourt

Houée-Levin⊥

et al. 2000

Annu. Rep. Prog. Chem., Sect. C

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We try in this review to survey advances in all the aspects of Radiation Chemistry (the effects of high energy or ionizing radiation), both basic and applied, made during the period 1995^1999, after the last report issued at the end of 1994. 1 Classically, two main classes of studies are relevant. The ¢rst one includes the primary phenomena induced by the interaction of high-energy radiation with a chemical system. The way the energy is spatially deposited is indeed highly nonhomogeneous and depends on the type of radiation considered. Mutual reactions between the primary species produced also depend on their initial spatial distribution, and therefore on the energy absorption pattern. The kinetic aspects derive directly from the initial events following radiation absorption and thus, when observed at times as short as possible, give useful information on the early energy distribution for each of the radiation types, X-and g-photons, electrons and heavy particles, and, on the in£uence of their intensity and energy per particle.The second class of studies utilizes the background knowledge of radiation chemistry to generate and then to observe the fate of chemical transient species known to be involved in very important chemical or biochemical processes. Numerous data, such as the nature of reaction products, the absolute rate constants, the sequence of elementary reactions constituting a mechanism, and the thermodynamic and spectroscopic properties of short-lived species have been attained. This kind of study of transients and reaction mechanisms, which can be approached only by pulse techniques (essentially pulse radiolysis or laser photolysis, each with its speci¢c advantages), constitutes the new ¢eld of fast to ultrafast chemistry. It concerns extended domains of physical, organic, inorganic, and bio-chemistry. Moreover, the understanding of mechanisms is quite helpful in suggesting new ways of synthesis or degradation induced by irradiation and is now extensively used in developing various speci¢c processes in applied chemistry. The number of studies on the chemical mechanisms and in applied radiation chemistry constitutes an increased fraction of the total publications in radiation chemistry, which we estimate to be around 4000 over the period considered (almost constant compared to the preceding 5-year

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Section: Copolymerization and Graftingmentioning

confidence: 99%

7 Radiation chemistry

Belloni

Delcourt

Houée-Levin⊥

et al. 2000

Annu. Rep. Prog. Chem., Sect. C

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“…These materials include chemisorptions fibers and fabrics with a developed characteristics surface. Scientific researches discuss different methods for manufacturing of the ion-exchange materials such as creation of functional active groups in the fiber polymers via reactions in polymer chains [1][2], and grafting of fibers with inorganic and organic monomers with subsequent reactions in the grafted chains [3][4][5][6]. The fibers could be used as material for different S.E.…”

Section: Introductionmentioning

confidence: 99%

Development of Pilot Scale System for Production of Polyamide-6 Fibers Grafted With Polymethacrylic Acid For Ion Exchange Applications

Shalaby

Ola

Al-Balakocy³

et al. 2018

Egypt. J. Chem.

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EMOVING the hazardous metals from wastewater especially industrial drainage is very important for preventing health problems in human beings, plants and animals. The ion exchanger has constructed as primary line of safeguards for that goal. In this study grafted polyamide-6 (PA-6) fibers with polymethacrylic acid (PMAA) was used as materials for the ion exchangers. Grafting was achieved under required time and temperature and the factors affecting the graft process were studied. The efficiency of the grafted fibers for adsorption of Cu 2+ , Pb 2+ and Cr 6+ was evaluated. The effect of adsorption parameters such as pH, duration of adsorption, initial ion concentration and the adsorption temperature on the degree of extraction (R %) and adsorption capacity (SC, mg/g) was studied. Optimization the conditions for the preparation on laboratory scale, adjustment and adaptation of these conditions to suit the production of these grafted fibers on pilot scale was accomplished.

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“…For example the membranes prepared by grafting of acrylamide onto nylon-6 films exhibit high water sorption capacity of approximate 25 moles of water per mole of grafted acrylamide [2]. Thermal characteristics [3] and antidripping property [4] of based material were improved after acrylic acid and methacrylic acid were grafted onto nylon. There was no reports was found on RIGP of VBC onto nylon-6.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of Radiation-Induced Graft Copolymerization of Vinylbenzyl Chloride onto Nylon Fibers

Ting

Nasef

Hashim

2015

AMM

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The graft copolymerization of vinylbenzyl chloride (VBC) onto nylon-6 fiber was investigated by the pre-irradiation method using electron beam. The effects of grafting parameters, monomer concentration, absorbed dose and reaction temperature were investigated. The empirical kinetic rate equation dGo/dt=k[M]^0.86*[D]^1.06 was used to describe grafting of VBC onto nylon-6. The overall activation energy for graft copolymerization of VBC was found to be 22.6 kJ/mol. The results revealed that the grafting kinetic was controlled by the amounts of trapped radicals and monomer molecules. Fourier transform infrared (FT-IR) was used to provide evidence for the formation of grafted copolymers.

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Some preliminary studies of the thermal behaviour of electron beam grafted polyamides

Cited by 6 publications

References 19 publications

7 Radiation chemistry

7 Radiation chemistry

Development of Pilot Scale System for Production of Polyamide-6 Fibers Grafted With Polymethacrylic Acid For Ion Exchange Applications

Kinetics of Radiation-Induced Graft Copolymerization of Vinylbenzyl Chloride onto Nylon Fibers

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