Styrene/Butadiene Rubber Prepared by Anionic Bulk Polymerization in a Twin-Screw Extruder

2015 ◽  
Vol 35 (1) ◽  
Author(s):  
Jiming Wang ◽  
Dong Shan ◽  
Long Yang ◽  
Weixing Liu ◽  
Bo Chen ◽  
...  
Keyword(s):  
Bulk Polymerization ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Twin Screw Extruder ◽  
Screw Extruder ◽  
Twin Screw ◽  
Styrene Butadiene

scholarly journals Best Practice for De-Vulcanization of Waste Passenger Car Tire Rubber Granulate Using 2-2′-dibenzamidodiphenyldisulfide as De-Vulcanization Agent in a Twin-Screw Extruder

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1139
Author(s):  
Hans van Hoek ◽  
Jacques Noordermeer ◽  
Geert Heideman ◽  
Anke Blume ◽  
Wilma Dierkes
Keyword(s):  
Best Practice ◽  
Chain Scission ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Twin Screw Extruder ◽  
Screw Extruder ◽  
Passenger Car ◽  
Tire Rubber ◽  
Twin Screw ◽  
Styrene Butadiene

De-vulcanization of rubber has been shown to be a viable process to reuse this valuable material. The purpose of the de-vulcanization is to release the crosslinked nature of the highly elastic tire rubber granulate. For present day passenger car tires containing the synthetic rubbers Styrene-Butadiene Rubber (SBR) and Butadiene Rubber (BR) and a high amount of silica as reinforcing filler, producing high quality devulcanizate is a major challenge. In previous research a thermo-chemical mechanical approach was developed, using a twin-screw extruder and diphenyldisulfide (DPDS) as de-vulcanization agent.The screw configuration was designed for low shear in order to protect the polymers from chain scission, or uncontrolled spontaneuous recombination which is the largest problem involved in de-vulcanization of passenger car tire rubber. Because of disadvantages of DPDS for commercial use, 2-2′-dibenzamidodiphenyldisulfide (DBD) was used in the present study. Due to its high melting point of 140 °C the twin-screw extruder process needed to be redesigned. Subsequent milling of the devulcanizate at 60 °C with a narrow gap-width between the mill rolls greatly improved the quality of the devulcanizate in terms of coherence and tensile properties after renewed vulcanization. As the composition of passenger car tire granulate is very complex, the usefulness of the Horikx-Verbruggen analysis as optimization parameter for the de-vulcanization process was limited. Instead, stress-strain properties of re-vulcanized de-vulcanizates were used. The capacity of the twin-screw extruder was limited by the required residence time, implying a low screw speed. A best tensile strength of 8 MPa at a strain at break of 160% of the unblended renewed vulcanizate was found under optimal conditions.

scholarly journals Development of Graphite- and Graphene Reinforced Styrene-Butadiene Rubber

2021 ◽  
Vol 4 (2) ◽  
pp. 103-108
Author(s):  
Pirityi Dávid Zoltán ◽  
Pölöskei Kornél
Keyword(s):  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Screw Extruder ◽  
Rubber Waste ◽  
Hardness Tests ◽  
Roll Mill ◽  
Twin Screw ◽  
Internal Mixer ◽  
Styrene Butadiene ◽  
Better Than

Abstract The environmental impact of rubber waste can be reduced by extending the lifetime of rubber products. It can be achieved by developing graphene/rubber nanocomposites with good abrasion resistance. In this paper, we investigated how rubber mixing technologies influence the mechanical properties of rubber. We added various amounts (0, 1, 5 and 10 phr) of graphite and graphene to rubber mixtures using a two-roll mill, an internal mixer, a single- and a twin-screw extruder. We performed tensile, tear strength and Shore A hardness tests on the vulcanisates and analysed their fracture surfaces with a scanning electron microscope. Our results show that graphene had a better reinforcing effect than graphite. Rubber mixing via extrusion may contribute to more severe polymer degradation, though their reproducibility is better than that achieved on a two-roll mill or in an internal mixer.

Bulk Polymerization of ∊-Caprolactone in Twin Screw Extruder

2000 ◽  
Vol 15 (1) ◽  
pp. 20-27 ◽  
Author(s):  
J. Gimenez ◽  
M. Boudris ◽  
P. Cassagnau ◽  
A. Michel
Keyword(s):  
Bulk Polymerization ◽  
Twin Screw Extruder ◽  
Screw Extruder ◽  
Twin Screw

Styrene/isoprene/butadiene integrated rubber prepared by anionic bulk polymerization in a twin-screw extruder

2014 ◽  
Vol 55 (5) ◽  
pp. 1163-1169 ◽  
Author(s):  
Xieyao Yuan ◽  
Jiming Wang ◽  
Dong Shan ◽  
Anna Zheng
Keyword(s):  
Bulk Polymerization ◽  
Twin Screw Extruder ◽  
Screw Extruder ◽  
Twin Screw

PHYSICOELECTRICAL PROPERTIES AND PIEZORESISTIVE SENSING OF THE EXTRUSION-BASED CONDUCTIVE RUBBER COMPOSITES: SIMULTANEOUS EFFECTS OF THE EXTRUSION PARAMETERS

2020 ◽  
pp. 000-000
Author(s):  
Jirawat Narongthong ◽  
Pongdhorn Sae-Oui ◽  
Manuchet Nillawong ◽  
Chakrit Sirisinha
Keyword(s):  
Mechanical Strength ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Rubber Composites ◽  
Screw Speed ◽  
Soft Matrix ◽  
Screw Design ◽  
Conductive Rubber ◽  
Twin Screw ◽  
Styrene Butadiene

ABSTRACT Flexible conductive rubber composites (CRCs) were prepared based on carbon black–filled oil-extended styrene–butadiene rubber soft matrix. Using a variety of screw designs, the simultaneous effects of the twin-screw extrusion parameters (i.e., kneading element, dispersing position, and screw speed) on the physicoelectrical properties of the CRCs were investigated statistically. The increased intenseness of the extrusion parameters significantly enhances the piezoresistive sensing via the improved filler dispersion, increased rubber–filler interaction, and weakened filler–filler networks. Nevertheless, the influence of the kneading elements on the properties of the CRCs significantly decreases with an increase in the intenseness of the dispersing position or the screw speed, referred to as a “negative interaction.” An extreme intenseness of the screw design causes the excellent piezoresistive sensing of the CRCs, but with undesirable mechanical strength. Because those properties need to be balanced, many methods of adjusting the CRCs to be more suitable for strain-sensor application, in terms of not only piezoresistive performance but also mechanical strength, were thus established.

Effects of White Rot Fungus Physisporinus sp., Isolated in Japan, on Styrene-butadiene Rubber

2020 ◽  
Vol 93 (9) ◽  
pp. 289-292
Author(s):  
Yumi SHIMIZU ◽  
Shuma SATHO ◽  
Taro NAKAJIMA ◽  
Hiroaki KOUZAI ◽  
Kiminori SHIMIZU
Keyword(s):  
White Rot ◽  
White Rot Fungus ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Styrene Butadiene
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