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Does it also happen to you sometimes? You are annoyed about double standards in your relationships with other people? Your neighbor kicks up a fuss if you have mistakenly chosen the wrong BBQ lighter on a sultry summer’s day, and now black smoke instead of spicy beech wood aroma swirls over the fence. He, on the other hand, does not even think anything of it when rattling through his garden on his old diesel-driven ride-on mower, spreading a suffocating atmosphere over the entire district, which – in terms of fine dust pollution – is located somewhere between Stuttgart and Shanghai.
What literally took my breath away recently was the reaction to the use of toxic gases on April 4th in the Syrian province of Idlib, where over 70 people died. Media and presidential emotions were running high, and the red lines that had been unexpectedly crossed caused many politicians to see darkest red. What do we learn from this? Obviously, mass murder is only a real moral excitement when poison gas is used. This moral slant is perfidious and allows the world’s powerful leaders and the media to warily ignore the fact that many thousands of people die every day with conventional rockets, guns, bombs, and landmines. And they get only upset when it seems politically or technically opportune, while perfectly knowing that deliveries of arms are diligently contributing to the improvement of export balances.
Another ugly example of incredible double moral was recently discussed in our editorial department:
In the past, we were quickly appalled by pictures of China that showed ailing mines, inhumane working conditions in production companies and cities that were battered with extreme air pollution. We pointed indignantly with our wagging moral finger toward the East. Now, however, that the Chinese government has begun drastic measures against the pollution of air, water and lands, we in the West harshly criticize the increasing costs of energy and production in the Middle Kingdom.
“With double standards you have only half as many stings of remorse,” texted the Austrian word artist Ernst Ferstl* once. I would like to add: “But there, where nothing exists, nothing can be stung.”
With friendly - not double - regards
PS: Thanks for the idea to this editorial to K.-H. Teschke, Postillon 24 (www.der-postillon.com) and my colleagues in the editorial department.
* Ernst Ferstl, Gedankenwege: Aphorismen, Brockmeyer Verlag, 2009
Self-repair or self-healing phenomena have mostly been inspired by nature. One of the elegant processes, which nature has developed to repair damaged tissue is through self-immunity. Such a phenomenon if imported into polymeric materials, especially for polyurethanes is of great relevance to material scientists, since that would effectively eliminate the necessity of repairing a damaged material. Be it material chemistry or conventional polymer chemistry, such materials have attracted the imagination of both material scientists and chemists. With the advent and current progress of material science, supramolecular chemistry, dynamic covalent and non-covalent chemistry, such materials could be synthesized by accurate precision and custom made designs. Chemistry certainly took giant strides to make matter tailor made for our daily life. The need of the hour is to develop materials, which would be dynamic enough to carry out certain functions as elegantly as nature performs. Material scientists in combination with polymer scientists and chemists have bridged that gap to develop dynamic materials to convert those dreams into a reality. In this current article, we will focus on the synthesis of such elegant dynamic materials that have been developed, which are truly dynamic imparting self-healing features into them. We will also discuss the envisioned challenges and potentials for such materials finding their way to commercial success.
In this article, a series of the most important properties of TPU materials for the wire and cable industry will be explored. Using international standards (ASTM), these will also be compared to those of a standard market product. ASTM and Wanhua’s own methods were used in the testing described, which took place in Wanhua’s CNAS-certified lab environment.
Polyolefins and in particular polypropylene (PP) are intrinsically not inert enough to withstand the chemical attack of oxygen and subsequently degrade due to an auto-oxidative mechanism. In consequence, the need for the protection (stabilization) of this substrate from auto-oxidation was identified early-on. In further consequence, specific stabilizers, called antioxidants, were developed in the 1960s and 1970s during the industrialization of PP. Especially the Long Term Thermal Stability (LTTS) of PP homo polymer burdens since the late 1970s on the use of a high molecular weight hindered phenol (Songnox 1010) or its synergistic combination with an aliphatic sulphur compound (Songnox DSTDP). Based on its unmatched cost/performance, these two stabilization systems are used since more than 40 years and are still suitable for many applications. Nevertheless, those systems have clear performance limitations, which in selected cases need to be overcome. One of those limitations is the extension of the LTTS performance of thick section PP articles at a testing temperature of 150 °C; particularly in the presence of additives (like fillers and sizing agents) which impart strong antagonistic interactions with the antioxidant system. Another limitation is the LTTS performance at significantly lower (test) temperatures of around 80 °C (or lower). In both cases, new antioxidant packages which yield a significant improvement in LTTS performance were developed and are discussed in this publication.
High performance TPVs are the new generation of thermoplastic vulcanizates (TPVs) that provide superior heat and oil aging behaviour. TPVs based on hydrogenated
acrylonitrile butadiene rubber and polyamide 12 (PA12) has been first developed by the dynamic vulcanization process, in which selective crosslinking of the elastomer phase during melt mixing with the thermoplastic phase (PA12) was carried out simultaneously. In this present investigation HNBR/PA12 and XHNBR/PA12 with blend ratio of 50:50, 60:40 and 70:30 wt% were prepared at 185 °C at a rotor speed of 80 min-1 for 5 min. Di-(2-tert-butyl peroxy isopropyl) benzene (DTBPIB) was chosen as the suitable crosslinking peroxide to pursue the dynamic vulcanization. TPV based on 50:50 HNBR/PA12 and XHNBR/PA12 show better physico-mechanical properties, thermal stability, heat resistance, and dynamic mechanical behavior amongst all the TPVs. For aging tests, TPVs were exposed to air and ASTM oil #3 respectively. Air aging tests were carried out in a hot air oven for 72 h at 125 °C while the oil aging tests were carried out after immersion of the samples into the oils in an aging oven. After aging, there is only slight deterioration in the physico-mechanical properties of the TPVs. In case of 50:50 blends of HNBR/PA12 and XHNBR/PA12, the retention of the properties after aging was found to be excellent. These TPVs are designed to find potential application in the automotive sector especially for under-hood-application, where high temperature resistance as well as high oil resistance is of prime importance.
This paper reviews different types of high-temperature thermoplastic elastomers (TPEs) and thermoplastic vulcanizates (TPVs) from rubber-plastic blends. The preparation, structure, and properties of these materials are discussed briefly. Strategies to further improve the high-temperature performance of these materials are presented herein. A synopsis of the applications of these high-performance materials in the automotive industry is reported, pointing out the gaps to motivate potential research in this field.
We used atomic force microscope (AFM) nanomechanics to investigate the mechanical properties of thermoplastic vulcanizates (TPV) at nanoscale. We examined six different compositions of polypropylene (PP)/ethylene propylene diene monomer (EPDM) TPVs. AFM nanomechanics indicated that the elastic modulus of the PP-rich phase decreases with decreasing PP content, and that of the EPDM-rich phase increases with increasing PP content. As such, we revealed that each phase is not a pure phase, because of the compatibility occurred between PP and EPDM in a mechanical blending process.
Americhem, a provider of colours, additives, and compounds for the automotive and transportation industry, is increasing its presence in European markets. In March 2016 the company acquired the TPE and PVC compounder Vi-Chem. Recently Americhem Europe Ltd. exhibited for the first time at the VDI Plastics in Automotive Engineering conference in Mannheim, Germany, an important networking platform for German and European automotive experts and presented its range of TPE and PVC soft-touch technologies.
Current changes in the packaging market necessitate new material solutions that favour the increased use of thermoplastic elastomers (TPE). Kraiburg TPE has recognised these trends and is responding to the requirements of its customers in the packaging industry with a broad spectrum of materials and services. The following article reports on the many advantages of using TPEs in product packaging with increased functionality and reliable sealing.
Based on a long-term research experience in hydrogenated styrene block copolymer, Kuraray has developed several types of novel elastomers. These are used for various applications including soft materials for commodity materials, adhesive and coating, film and packaging. Automotive is one of the key applications of these materials and we have investigated various advantages for this application. In this article we introduce Septon V, Septon 4000 series, and Septon Q for advanced automotive application usages.
Lubrizol Engineered Polymers has announced the winners of its premiere
TPU DesignFEST challenge. The competition was conducted in collaboration with the newly chartered Outdoor Product Design & Development (OPDD) Department at Utah State University.