Electron‐beam‐initiated grafting of triallyl cyanurate onto polyethylene: Structure and properties

Abstract

SUMMARYPolyethylene (PE, 100 parts by weight) was mixed with methyl methacrylate (MMA, up to 5 parts by weight) at 120°C and subsequently exposed to electron radiation of different doses (up to 20 Mrad) to prepare PE/MMA graft copolymers. Successful grafting was verified by IR spectroscopy. Gel formation indicated crosslinking. Grafting increased with increasing MMA concentration and increasing irradiation dose. Crystalline melting temperature and percent crystallinity were lower than those of untreated PE. Tensile strength, elongation at break and dielectric constant of grafted samples were measured and discussed. ZUSAMMENFASSUNG:Polyethylen (PE, 100 Gew.-Teile) wurde mit Methylmethacrylat (MMA, bis zu 5 Gew.-Teilen) gemischt und anschlieljend mit Elektronen (bis zu 20 Mrad) bestrahlt, um PE/MMA-Pfropfcopolymere herzustellen, deren Bildung mittels IR-Spektroskopie nachgewiesen wurde. Gelbildung wies auf eine Vernetzung wahrend der Bestrahlung hin. Zunehmende MMA-Konzentration und hohere Bestrahlungsdosen verringerten die Kristallit-Schmelztemperatur und den Kristallisationsgrad des PE. Zugfestigkeit, Bruchdehnung und Dielektrizitatskonstante wurden gemessen und diskutiert.

Structure-property relationship of electron-beam-modified EPDM rubber

“…4 The modification of polyethylene and ethylene vinyl acetate (EVA) using this technique was reported by Tikku et al 5 and Datta et al, 6 respectively. Chaki et al 7 described the effect of MMA on the grafting efficiency and the physical properties of PE in the presence of electron-beam irradiation. Banik et al studied the structural modification of fluoroelastomers by electron beam and also its impact on the dynamic mechanical properties.…”

Effect of ambient‐temperature and high‐temperature electron‐beam radiation on the structural, thermal, mechanical, and dynamic mechanical properties of injection‐molded polyamide‐6,6

“…In the existing literature on radiation technology, one finds extensive use of tri-allyl cyanurate (TAC) and other acrylate monomers, such as ditrimethylolpropane tetraacrylate, trimethylolpropane triacrylate, tetramethylolmethane tetraacrylate, and tripropyleneglycol diacrylate, as commonly used radiation sensitizers. [12][13][14][15][16][17][18] The acrylate monomers and TAC are all thermally unstable in the PA66 processing temperature range of 533-573 K. To obviate the processing instability of TAC, some studies have been carried out where TAC was incorporated into PA66 by the dipping of the tensile specimens in a TAC solution. The samples were subsequently irradiated.…”

Development of new thermoplastic elastomers from blends of polyethylene and ethylene-vinyl acetate copolymer by electron-beam technology

“…It may be pointed out that the tensile strength of pure PE and EVA passes through a maximal at an intermediate radiation dose while the elongation at break decreases with increase in the radiation dose. [21][22][23] To understand the modulus and strength of the electron-beam crosslinked PE/EVA blend, the same parameters were calculated theoretically using an approach similar to that of Takayanagi et al 28 and assuming a two-phase material combining series and parallel elements. Since the LDPE used in this study has a high MFI (low viscosity at mixing temperature), the parallelmodel upper bound was considered as follows: These are shown in Figure 3.…”

“…20 The effects of electron-beam radiation on the structures and properties of polyethylene (PE) and ethylene-vinyl acetate (EVA) in the presence of different types of polyfunctional monomers have also been reported. [21][22][23] The influence of electron-beam irradiation on the mechanical properties of polypropylene-EPDM rubber blends was studied by Harnischfeger et al 24 Martinez-Padro et al 25 carried out gamma radiation-induced crosslinking of PE and EVA blends. Possible chemical reactions and alternative irradiation methods were also discussed.…”