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Dokument Nr.200301364 (klicken Sie bitte auf die Dokumentnummer um dieses Dokument anzuzeigen)
TitelElectron-beam irradiation of poly(vinyl chloride)/epoxidized natural rubber blends in presence of trimethylolpropane triacrylate
AbstractElectron-beam initiated crosslinking of poly(vinyl chloride)/epoxidized natural rubber blends, which contained trimethylolpropane triacrylate (TMPTA), was carried out over a range of irradiation doses (20-200 kGy) and concentrations of TMPTA (1-5 phr). The gel content increased with the irradiation dose and the TMPTA level, although the increase was marginal at higher doses and higher TMPTA levels. Blends containing 3-4 phr TMPTA achieved optimum crosslinking, which in effect caused the maximum tensile strength (TS) at a dose of 70 kGy. A further addition of TMPTA caused a decline in the TS above 40 kGy that was due to embrittlement, which is a consequence of excessive crosslinking and the breakdown of the network structure. The possible formation of a more open network as a result of the breakdown of the network structure was further confirmed by the modulus results. Dynamic mechanical analysis (tan delta curve) and scanning electron microscopy studies on samples irradiated at 0 and 200 kGy were undertaken in order to gain further evidence on the irradiation-induced crosslinking. The plasticizing effect of TMPTA prior to irradiation and the formation of microgels upon irradiation were also discussed. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 81: 1926-1935, 2001 (orig.)
Control terms engl.ACRYLIC ACID ESTERS; BLENDS; CONCENTRATION; CROSSLINKING; ELECTRON BEAMS; ELECTRON MICROSCOPY; EMBRITTLEMENT; EPOXY RESINS; IRRADIATION; MICROGELS; NATURAL RUBBER; NETWORKS; PLASTICIZATION; PLASTICIZERS; POLYVINYL CHLORIDE; TENSILE STRENGTH
Control terms germanACRYLSAEUREESTER; MISCHUNGEN VON POLYMEREN; KONZENTRATION; VERNETZUNG; ELEKTRONENSTRAHLEN; ELEKTRONENMIKROSKOPIE; VERSPROEDEN; EPOXIDMASSEN; BESTRAHLUNG; MIKROGELE; NATURKAUTSCHUK; NETZWERKE; WEICHMACHUNG; WEICHMACHER; POLYVINYLCHLORID; ZUGFESTIGKEIT