Influence of Gamma-Irradiation on Dielectric Properties of Recycled Polyethylene Composites
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1038-O05-06
Influence of Gamma-Irradiation on Dielectric Properties of Recycled Polyethylene Composites Ulmas Gafurov, and Zekie Fazilova Composite Materials, Institute of Nuclear Physics, Ulugbek, Tashkent, INP, Tashkent, 702132, Uzbekistan Abstract
The influence of γ-irradiation on the dielectric losses (tg δ ) and permittivity (ε′ ) of recycled high density polyethylene (HDPER) thermoplastic dynamic vulcanizates (TDV) has been investigated. The materials and composites that were studied include HDPER:EPDM, HDPER+EPDM+GTR, HDPER+EPDM+GTR/plast; EPDM (ethylene-propylene diamine). The experimental data obtained shows significant differences between dielectric properties different samples, as well as between the unirradiated and γ-irradiated samples. Keywords: dielectric losses(relaxation), dielectric permittivity; polyethylene; polymer composites, thermoplastic dynamic vulcanizates (TDV); γ-irradiation
Introduction The most dynamic developments in the microelectronics industry are based on the efficient utilization of radiation-crosslinkable negative photoresist polymers and the radiation-degradable positive photoresist polymers. Rapid prototyping and rapid tooling have become indispensable methods in the continuously renewing manufacturing technologies of metal and plastic parts for almost all the industrial branches. In general, the irradiation of polymers yields a similar pathway of development in the early phases, mostly in the radiation cross-linking of polymers and in the radiation sterilization of polymer products [see for example refs. 1-7]. It is known that widely used thermoplastic elastomers (TPE) can be prepared on the base of mixtures composed of non-vulcanized raw rubber and thermoplastic polymers like polyolefins, see refs. [8,9]. Their properties can be notably improved via application of dynamic vulcanization technology and some types of radiation [10-11]. Vulcanization can be carried out chemically via addition of various curing agents or by means of various types of radiation [12]. Phase modification occurs upon controlled irradiation (e. g. gamma- or electronic), namely: cross-linking, decomposition, changing of crystallinity, chemical bonding between the phases, etc. [10-13]. Properties of the TPE materials obtained can be tuned by controlling the ratio of the thermoplastic and rubber-like components. The chemical interconnection between the surface of a binder and the PE matrix was investigated [14] by means of irradiation combined with different types of chemical treatment of the binder, in order to improve the strength properties of glass fiber reinforced plastics. The investigations of the complex action of surface treatment of GFRPs (Glass Fiber Reinforced Plastics) based on thermoplastic matrices and radiation treatment on the strength properties of model glass fiber reinforced plastic, made it possible not only to reveal a modifying effect of radiation, but also to assess the radiation stability of the GFRPs. Fainleib et al. [15] established that irradiation of recycled polypropylene,
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