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Polyolefins Journal، جلد ۱۲، شماره ۳، صفحات ۲۱۳-۲۲۲
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عنوان انگلیسی Styrenic thermoplastic vulcanizates consisting of SEBS/PP/LLDPE with improved compression set for high-performance application via reactive extrusion
چکیده انگلیسی مقاله Styrenic thermoplastic vulcanizates (STPV) consist of polypropylene (PP) and linear low density polyethylene (LLDPE) as the continuous phases and a crosslinked hydrogenated styrene block copolymer (SEBS) as the dispersed phase were prepared in an industrial scale using a corotating twin-screw extruder. Morphological study of the TPVs was carried out using a scanning electron microscope (SEM). Rheological study of the SEBS compounds carried with different content of 2,5-Dimethyl-2,5-di(tert-butylperoxy) hexane peroxide (0.5, 1, 2 and 4 wt. %). T90 appeared with 4 w% peroxide shows that curing has been completed. Effect of peroxide content (0.5 to 1.2 wt.%) on properties of the TPVs was led to an increase in tensile strength (from 5.6 to 7.4 MPa) and hardness to a certain extent (74 shore A). On the other hand, mechanical properties such as the elongation at break (from 592% to 284%), the melt flow index (MFI) (from 29.6 to 3.14 g/10 min at 190 °C, 10 kg) and tear strength (from 35 to 30 kg f/cm) are decreased. The compression set at low temperature (70 °C) is not changed so much, at high temperature (120 °C), while, is reduced due to higher curing (from 69% to 46%). Heat aging was carried out (at 85 °C for 168 h) on the TPVs which were prepared via the different content of peroxide (0.5 wt. % to 1.2 wt. %). It was found that the results of elongation and the hardness after aging have the lowest amount using 0.9 wt.% peroxide. However, the tensile strength after aging decreased with increasing the content of peroxide. As a result of increasing curing with increasing content of peroxide, the melting point of the prepared TPVs was disappears. The results of using triallylcyanurate (TAC) and bismaleimide (BMI) as a co-curing agent in peroxide curing indicate that all of the tensile strength, hardness and elongation at break (from 897 to 1082%) of the STPV were increased with BMI. Heat ageing study and compression set on the STPV with TAC was slightly raised compared to BMI. Also, the results of dynamic vulcanization on the properties of TPV based on SEBS/LLDPE/PP indicate that Crosslink density and gel content of TPV are close to that of EPDM rubber (fully crosslinked) and higher than that of TPE (without crosslinking). The results show that the tensile strength and density of the dynamically crosslinked blend have not changed significantly under peroxide curing.
کلیدواژه‌های انگلیسی مقاله STPV, Rheology, peroxide curing, Bismaleimide, crosslink density
نویسندگان مقاله Mehri Dana |
Department of Polymer & Materials Chemistry, Faculty of Chemistry and Petroleum Science, Shahid Beheshti University, GC, 1983969411Tehran, Iran

Mohammad Reza Nabid |
Department of Polymer & Materials Chemistry, Faculty of Chemistry and Petroleum Science, Shahid Beheshti University, GC, 1983969411Tehran, Iran

Gholamhossein Zohuri |
Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran

Saeid Asadi Shahidi |
Department of Materials Engineering, Pouya Gostar Khorasan Co. of Part Lastic Group, Mashhad, Iran

Sohail Yazdanbakhsh |
Department of Materials Engineering, Pouya Gostar Khorasan Co. of Part Lastic Group, Mashhad, Iran

نشانی اینترنتی http://poj.ippi.ac.ir/article_2124_d68e7bce072cb0b82e03bd09050c5711.pdf
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