3D printing of synthetic rubber ink via the direct ink writing process
by Sarath Suresh Kamath and Jae-Won Choi, The University of Akron Natural rubber, which is mainly composed of poly-cis-isoprene and
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Articles
Mechanism of oxidation in natural rubber compounds at lower (ambient) temperatures
The oxidation mechanism of natural rubber was studied using several techniques. In a prior article, it was found that the crosslink distribution (sulfur types including polysulfidic, disulfidic and monosulfidic) in a belt coat (conventional cured natural rubber compound) had a different crosslink distribution, depending on the aging temperature (ref. 1). The belt coat compound extracted from an oven aged (65°C) tire was compared to the belt coat compound extracted from a normal service tire (23°C, the average annual temperature in Phoenix, AZ)
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Post International Elastomer Conference Show Daily
This follow-up to the 2021 International Elastomer Conference and Expo, held last month in Pittsburgh, Pennsylvania, and
published for the Rubber Division, ACS by Lippincott & Peto, Inc., includes photographs and summaries of IEC events, including the 2022 Science & Technology Award winners, Rubber Division, ACS
service award recipients, 2021 scholarship and Rubber Technology Training Award recipients, the Experience Elastomers
Student Outreach Program, the Rubber Division’s 2021-2023 Strategic Plan, the inaugural Rubber Chemistry & Technology Excellence Award and Expo exhibitors.
Homegrown bioelastomers: A sustainable opportunity
It has been estimated that there are 2,500 plants that can produce a natural latex: a bioelastomer. Of course, not all of them can produce a polymeric latex with a high molecular weight, readily processable and commercially viable. To date, three species account for the majority of interest associated and centered
around the discussion of natural latex: Hevea rubber trees (Hevea brasiliensis), guayule (“why-yule-ee,” Parthenium argentatum) and rubber dandelion (Taraxacum kok-saghyz). The rubber tree, typically found in tropical Southeast Asia, produces nearly 90% of the world’s natural latex. Guayule (a desert shrub) and rubber dandelion are plants found in more temperate regions in the U.S., and figure to be potential domestic sources of natural rubber and latex.
Custom Profile selects Ineos Styrolution Styroflex 4G80 for medical tubing solution
Custom Profile, a manufacturer of thermoplastic profile extrusions and sub-assemblies, has selected Styroflex 4G80 from Ineos Styrolution, a global provider of styrenics said to supply medical device designers with safe and innovative, next generation medical tubing options.
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Patents for November
Patent as compiled for November Shaped elastomeric container with integrated leak resistant seal and pressure shieldU.S. patent: 11,124,330Issued: September 21,
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Making the green tire even greener
Michael Kempf, Head of Market Segment Tires & MRG at Evonik’s Silanes Business Line, outlines how the coupling agent XP Si 466 EXT boosts the sustainability of passenger car tires.
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Guill Tool introduces a co-extrusion crosshead designed for irrigation tubing
Guill Tool introduces Series 824, a co-extrusion crosshead designed for irrigation tubing with an emitter tool. Manufactured from stainless steel, this new crosshead features balanced flow design with spiral technology that improves flow characteristics at all extruder speeds. Dual feed ports provide concentric compound flow, while the splits flow from one extruder to feed the inside and outside layers via a manifold assembly. Series 824 is adaptable to all popular extruders on the market currently
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Novel value-added thermoplastic elastomers bonding to polyamides
Bonding thermoplastic elastomers to polar and non-polar substrates has been widely studied in the past few decades to create products that enhance ergonomic comfort and functionality. Overmolding a TPE compared to two-shot molding is a litmus test for bonding the material to the substrate. The TPE must wet the cold surface and must melt a few nanometers of the surface of the substrate that is being overmolded on to facilitate bonding.
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Recyclate based composite TPO membrane for embedded waterproofing of concrete roofs
Preformed membranes are primarily made from EPDM, PVC, TPO, HDPE, atactic PP, SBS and modified bitumin, etc. The focus of this article is TPO membranes, which are extensively used for exposed roof waterproofing and heat insulation. First introduced in Europe in the early 1990s, TPO membranes were developed as an alternative to PVC to overcome issues around plasticizer migration and membrane integrity breakdown, resulting in wash away and chemical contamination, as well as mold growth affected by weathering over the years; and finally culminating in cracking and leakages. TPOs have since become very popular due to their durability, UV and heat resistance, energy efficiency, as well as cost-effectiveness.
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