Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2013 - zeszyt 6

Application of ion bombardment to modification tribological properties of rubber

nr katalogowy: 81466

So far, ion irradiation used to be applied mainly for modification of metals and ceramics [1]. Recent works on its effects towards polymers are devoted mainly to plastomers [2], whereas papers on ion beam treatment of elastomers are mostly associated with medical applications [3]. Despite the influence of energetic ions on composition and structure of engineering semicrystalline polymers seems to be well established [4], knowledge on effects possible to obtain for amorphous elastomers still remains unexplored. Ion beam treatment seems to be very promising technique, especially for elastomers, because of the extent of modification limited to the top surface layer of materials, not exceeding some micrometers, leaving overall elasticity of rubber parts intact. From our recent work it follows, that interactions between ion beam and rubber macromolecules seem to be mainly of energetic character [5]. As a result hydrogen release takes place, which initiate further modification of rubber. Depending on its macromolecular structure, graphitization can be preferably accompanied either by degradation or crosslinking. The former produces free radicals, as a result of chain scission, which readily attract oxygen and modify surface polarity of elastomers. The latter makes their surface layer shrunk, what results in microcracking and development of surface geometry, which together with an increased hardness can modify frictional contact area. EXPERIMENTAL Materials Conventional vulcanizates based on: natural (NR), styrene-butadiene (SBR), butadiene-acrylonitrile rubber (NBR) or its mixes with chloroprene rubber (CR), as well as special elastomers: thermoplastic polyurethane (TPU), thermoplastic polyolefine (TPE) elastomer, silicone (Q), chloroprene (CR) and hydrogenated butadiene-acrylonitrile (HNBR) rubbers - Table 1, were subjected to irradiation by ions of various mass and chemical reactivity: H+, He+, F+ or Ar+. The treatment was realiz[...]

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