The effect of styrene content on the properties of electron irradiation-vulcanized SBR loaded with carbon black was pronounced only at low irradiation doses where the crosslinking densities were not so high. At high doses, no effect was observed especially for SBR containing ZnO. It was also observed that ZnO (3 phr) increased the tensile strength of SBR containing 23.5 wt.-Yo styrene by 20% at 20 kGy irradiation dose, compared to 5% at higher doses for SBR containing 46 wt.-Yo styrene. However, the increase in tensile strength by ZnO for loaded SBR (23.5%) was almost 17% at all irradiation doses. Besides, tear strength, abrasion resistance and elongation at break were remarkably improved. The high efficiency of ZnO toward SBR (23.5%) may be attributed to the higher butadiene content. The behavior of SBR (46%) at 20 kGy was surprising, since both tensile strength and elongation at break were almost maximum.
ZUSAMMENFASSUNGDer EinfluR des Styrolgehalts auf die Eigenschaften von elektronenstrahlvernetztem, ruRgefulltem Styrol-Butadien-Kautschuk (SBR) war nur bei niedrigen Strahlungsdosen, d. h. geringen Vernetzungsgraden, ausgepragt. Bei hohen Dosen wurde kein Effekt beobachtet, insbesondere fur ZnO-enthaltenden SBR. Es wurde auRerdem festgestellt, daR ZnO (3 phr) die Zugfestigkeit von SBR mit einem Styrolgehalt von 23,5 Gew.-Vo bei 20 kGy um 20% verbesserte, verglichen mit SBR mit 46 Gew.-Vo Styrol. Die Zunahme der Zugfestigkeit fur gefullten SBR (23,5%) betrug bei allen Strahlungsdosen nahezu 17%. Daneben waren Reinfestigkeit, Abrasionswiderstand und Bruchdehnung erheblich verbessert. Die hohe Effizienz von ZnO bei SBR (23,5%) konnte auf dessen
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