| 摘要 |
<p>The invention concerns thermoplastic polymer compositions for skeletal replacements and methods of their production. The composition according to the invention consists of 12 - 91 wt.% of a polyolefm with the glass transition temperature higher than 320 K, which is an ethene - bicyclo[2.2.1]hept-2-ene copolymer with molar concentration of the latter at least 25 % and 75 % at most, of 2 - 72 wt. % of a polyolefm with the glass transition temperature lower than 250 K, which is (i) ethene homopolymer of density at least 0.92 g.cm<SUP>-3</SUP> and 0.97 g.cm<SUP>-3</SUP> at most or (ii) copolymer of ethene with an a-olefin selected from a group consisting of propene, but-1-ene, hex-1-ene, oct-1-ene and dec-1-ene, with density at least 0.85 g.cm<SUP>-3</SUP> and 0.96 g.cm<SUP>-3</SUP> at most or a mixture of ethene homopolymer (i) and ethene - a-olefin copolymer (ii) in any ratio, and of 5-50 wt.% of carbon fibres with the carbon content at least 94 wt.%, density at least 1.80 g.cm<SUP>-3</SUP> and 1.92 g.cm<SUP>-3</SUP> at most and a fibre diameter of at least 4 µm and 9 µm at most. The described composition is prepared by mixing in the melt a polyolefm with the glass transition temperature higher than 320 K and a polyolefm with the glass transition temperature lower than 250 K at a melt temperature of the stirred mixture of at least 430 K. The formed thermoplastic polymer composition is irradiated with ?-rays or accelerated electrons at a dose of at least 20 kGy and 250 IcGy at most, to advantage in inert atmosphere, whereupon the irradiated material is mixed in the melt with carbon fibres at a temperature of at least 430 K. The material can be stabilized against oxidative degradation by admixture of at least 0.1 wt.% of a-tocopherol.</p> |
