5 edition of Crosslinking of commercial polyethylenes by 10 MeV electrons found in the catalog.
Crosslinking of commercial polyethylenes by 10 MeV electrons
|Statement||by Ajit Singh ... [et al.].|
|Series||AECL research (Series) -- 11259|
|Contributions||Singh, Ajit., Atomic Energy of Canada Limited.|
|The Physical Object|
|Pagination||11 p. :|
|Number of Pages||11|
Molecular Structure and Physical Properties of E-Beam Crosslinked Low-Density Polyethylene for Wire and Cable Insulation Applications Susan Dadbin,1 Masoud Frounchi,2 M. Haji Saeid,1 Fazel Gangi2 1 Radiation Processing Center, Atomic Energy Organization, P.O. Box , Tehran, Iran Polymer Engineering Group, Department of Chemical Engineering, Sharif . A thermosetting polymer, resin, or plastic, often called a thermoset, is a polymer that is irreversibly hardened by curing from a soft solid or viscous liquid prepolymer or resin. Curing is induced by heat or suitable radiation and may be promoted by high pressure, or mixing with a is not necessarily to be applied externally. It is often generated by the reaction of the resin.
-polyethylenes-polyamides-polyalcohols. polyamides. Adipic acids, one of the monomers used to make nylon, has a total of six carbon atoms with two carboxylic functional groups. Which structure is correct?-(CH2)6COOH-HO(CH2)6OH-HOOC(CH2)4COOH-HOOC(CH2)6NH2. HOOC(CH2)4COOH. 26 High Temperature Thermosets A thermoset or network polymer is an organic material where the molecules are tied together through chemical bonds (crosslinks) and therefore they cannot move past one another. As a result, these materials exhibit a File Size: KB.
Konstantinia D. Papadimitriou, Maria Geormezi, Stylianos G. Neophytides and Joannis K. Kallitsis, Covalent cross-linking in phosphoric acid of pyridine based aromatic polyethers bearing side double bonds for use in high temperature polymer electrolyte membrane fuelcells, Journal of Membrane Science, , (1), (). The network segment density (γ g) by solvent‐swollen compression modulus of gum stocks and of stocks containing nonreinforcing fillers was calculated to be × 10 −9 h 0 Sf/ϕ B d 2 in mmole/m 3 of gel at 25°C, where h 0 is the height of the unswollen sample in cm, S is the slope of the height versus applied weight curve in g per mil ( in.), ϕ B is the volume fraction of.
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Get this from a library. Crosslinking of commercial polyethylenes by 10 MeV Electrons. [A Singh; Whiteshell Laboratories.; Atomic Energy of Canada Limited.]. Introduction. Many studies of crosslinking of polyethylene by electron irradiation have been reported but the electron beam which was used for irradiation normally had energies of less than 5 MeV.In this work, we have used high energy electron beams (5 and 10 MeV) for irradiation of low density polyethylene (LDPE) and high density polyethylene (HDPE) samples in dose Cited by: The radiation crosslinking of low density polyethylene (LDPE) and high density polyethylene (HDPE) irradiated with 5 and 10 MeV electron beams.
The crosslinking of the PE sheets was carried out at - 25,and [degrees]C in inert atmosphere or air with electron beam. At and [degrees]C the irradiation was made with Mev energy from a type of Microtron accelerator, current 50 mA, pulse 4.
Several studies have indicated that the gel content and the crosslinking density of EVA/LDPE blends at an optimum radiation dose increase with increasing EVA. In the present study, low density polyethylene (LDPE) has been crosslinked at °C with three different systems by a) using peroxide, b) peroxide and accelerator and c), peroxide, accelerator and sulfur.
The effect of chemical crosslinking on LDPE structure has been investigated using torque measurements, Fourier transform infrared spectroscopy Cited by: 5. Properties of polyolefins can be modified by crosslinking process. Different methods of crosslinking and effect of process parameters, selection of crosslinking agents and applications are briefly discussed.
IPC Code: C 08 F 2/00 Keywords: Crosslinking, polyethylene, crosslinking agents. Polyethylenes are commodity plastics. They accountFile Size: KB. Experimental samples were crosslinked by passing them, mounted on a cooled aluminum plate, through a 50 mA beam of MeV electrons generated by an electron accelerator, by means of a conveyer whose speed could be varied between 1 and 6 cm/s.
The accelerator was manufactured by the Budker institute of Nuclear Physics (Russia).Cited by: How it Works. Electron beam processing effectively and efficiently creates beneficial changes in material properties and performance with processes such as polymer crosslinking, long-chain branching and chain process involves accelerating a beam of.
crosslinking between free monomers or polymer chains. While the Mn, value of elasthane samples did not change. Increased MW, was attributed to crosslinking of the polymer, and may also reflect the loss of low molecular weight fragments.
This suggests degradation, in the absence of stress, at the surface but not the bulk of the polymer. Figure 2. The text is preceded by brief descriptions of relevant radiation chemistry of organic compounds and known effects of high-energy radiation on the leading polymers used in blends, with the aim of enabling future workers to draw upon this knowledge in the design of experiments, in industrial applications, or both.
CROSSLINKING OF RECYCLED POLYETHYLENE BY GAMMA AND ELECTRON BEAM IRRADIATION ,M. Avalos-Borja 1, lol,M,Vazquez 1, z2,M.P. Carreon 3 and o 3" 1 Instituto de Fisica, UNAM; 2 Instituto en Investigaci6n en Materiales UNAM; and 3 Instituto de Ciencias Nucleares UNAM.
Ciudad Universitaria, Mexico, D.F. This study’s goal was to describe the influence of a wide range of ionizing beta radiation upon the changes in surface layer mechanical properties and structural modifications of selected types of polymer. Radiation crosslinking is a process whereby the impingement of high-energy electrons adjusts test sample structures, thus enhancing the useful properties of the material, e.g.
Aspects Regarding Radiation Crosslinking of Elastomers. By Elena Manaila, Maria Daniela Stelescu and Gabriela Craciun. Submitted: November 7th Reviewed: April 24th Published: September 12th DOI: /Cited by: Crosslinking chemistry for polymer networks.
Walker et al. 0 t 0 I I I I I / I I I temperature °C Figure 1 D.s.c. traces of model compounds 5 and 6 at a heating rate of 10°C min- I i Table 1 Model compounds derived. In chemistry and biology a cross-link is a bond that links one polymer chain to another.
These links may take the form of covalent bonds or ionic bonds and the polymers can be either synthetic polymers or natural polymers (such as proteins). In polymer chemistry "cross-linking" usually refers to the use of cross-links to promote a change in the polymers' physical properties.
using an electron accelerator model JOB ( - MeV and – 25 mA) at the irradiation dose of 10, 20, 30, 40, 50, 60, 80 and kGy. After irradiation, the cross-linked LDPE plates were thermal expanded to produce foams in an oven at ºC, under a forced air stream during 6 minutes in which ADCA decomposition take place.
neutralization, presumably by detrapping of the electrons, and hence terminates these graft and crosslinking reactions. Table 2 Effect of 1% additives on intensity of triplet spectrum at 77 К obtained from LDPEin 10% AA/benzene irradiated to Mrads at 77 К Additive Relative intensity of triplet nil diphenyl (—) p-nitro benzoic acid (—).
As the dose is increased, the crosslinking level will increase. For polyethylene, a dose range for an initial experiment may be kGy to kGy (equivalent to 10 megarads to 20 megarads). The number of samples will depend on your testing required to determine if.
where s is sol fraction, p 0 is degradation density, q 0 is crosslinking density, μ 1 is initial molecular weight (M ̄ n), and d is dose. Electron beam irradiation of polymers results in both random chain scission and random inter-chain bond formation (i.e., crosslinking), and the ratio of scission to crosslinking, p 0 /q 0, describes the inverse crosslinking efficiency of a given Cited by:.
Attenuation of 14 MeV Neutrons 47 The sensitivity of the chamber to y-fays will be different from its sensitivity to neutrons, because (1) the value of W for electrons is less than that protons, and (2) the ratio " Dose in Polyethylene/Dose in tissue " per unit fluence for y-rays is different.
For y-rays of Mev photon energy, the chamber.Chapter 1, Pages Kim M. Morehouse * and Vanee Komolprasert ** The information and conclusions presented in this book chapter do .of beta radiation on properties of surface layer of polyamide Irradiation of polymers initiates crosslinking process in the structure especially in micro-layers.
Radiation doses of 0, 33, 66, 99,and kGy were used for unfilled polyamide 12 with the 5% cross-linking agent (triallyl isocyanurate).
Applied radiation doses caused.