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BLUE HEN CHEMIST University of Delaware, Department of Chemistry and Biochemistry Annual Alumni Newsletter Number 41 August 2014 John L
BLUE HEN CHEMIST University of Delaware, Department of Chemistry and Biochemistry Annual Alumni Newsletter NUMBER 41 AUGUST 2014 JOHN L. BURMEISTER, EDITOR ON THE COVER THREE Newly Renovated Organic Laboratories! # 3 8 - P AGE I BLU E H E N C H E MIST ON THE COVER One of the three newly-renovated Organic Chemistry teaching laboratories (QDH 302) is shown. Work on the labs (QDH 112, 318, 320) started on May, 2013 and was completed in February of this year. The refurbishment of the labs was a crucial step in the ongoing revision of the Organic Chemistry laboratory curricula. The additional fume hoods allow each student to conduct experiments individually while minimizing their exposure to chemical reagents. The transparent glass construction helps teaching assistants observe students while they work. The hoods are equipped with inert-gas lines, which can allow the students to work with air-sensitive compounds and learn advanced laboratory techniques. The hoods are also equipped with vacuum lines, which obviate the need for water aspirators and dramatically reduce the labs' water usage. The lab design also allows for instrumentation modules to be swapped in and out according to the needs of the experiment. Carts are designed to house instruments such as gas chromatographs and infrared spectrometers as well as any necessary computer equipment. These carts can then be wheeled into docking areas that have been fitted with the necessary inert gas and electrical lines. The design expands the range of possible instrumentation the students can use while occupying a small footprint of lab space. The labs also feature large flat screen monitors, wireless internet, and computer connectivitiy that will enable the use of multimedia demonstrations and tablet computing. -
FL.Datasheet Kevlar® Distribution Program.Indd
MOVING HIGH PERFORMANCE FIBERS FORWARD KEVLAR® DISTRIBUTION PROGRAM FIBERS PROCESSES PRODUCTS WHY FIBER-LINE® DUPONTFIBER TM OPTICAL DISTRIBUTION CABLES PROGRAM? Key Features FIBER-LINE® values its relationships with both its customers and • Purchase small quantities of Kevlar® suppliers. Over the past several years, FIBER-LINE® and DuPontTM have Para-Aramid formed a strong partnership based upon the synergies between both • Many deniers & types available organizations. • Customize your Kevlar® solution with FIBER-LINE® performance adding processes FIBER-LINE®’s ability to add value to the already attractive properties of both Kevlar® Para-Aramid & Nomex® Meta-Aramid creates more opportunity in the market place to provide solution driven products to a diverse range of markets. Because FIBER-LINE® already processes so many different types and deniers of both Kevlar® & Nomex®, FIBER-LINE® have been authorized by DuPontTM to distribute small quantities of these fibers to an ever- growing customer base. Through this program, we hope to introduce businesses of all sizes to the benefit of aramid fibers. Contact us today for small order quantity orders. Available Deniers 200, 380, 400, 750AP, 800AP, 1000, 1000AP, 1420, 1500, 1500AP, 1500BK(Black), 2160, 2250, 2840, 3000, 7100. MOVING HIGH PERFORMANCE FIBERS FORWARD KEVLAR® PARA-ARAMID (HM) BARE FIBER PERFORMANCE Chemical Chemical Chemical Abrasion Yarn on Yarn Ultraviolet (UV) Flame Resistance Resistance Resistance Resistance Abrasion Resistance Resistance (Acid) (Alkali) (Organic Solvent) P O X P P P P CHEMICAL COMPATIBILITY Chemical Resistance to Acid: Degrades in Formic, Hydrochloric, and Sodium Hydroxide acid. Chemical Resistance to Alkali: Strong alkalis will attack at high temperature or concentration. Chemical Resistance to Organic Solvent: Degrades moderately in Carbon Tetrachloride and Ethylene Glycol/Water. -
Exploring the Influence of Entropy on Dynamic Macromolecular Ligation
Exploring the Influence of Entropy on Dynamic Macromolecular Ligation Zur Erlangung des akademischen Grades eines DOKTORS DER NATURWISSENSCHAFTEN (Dr. rer. nat.) der KIT-Fakultät für Chemie und Biowissenschaften des Karlsruher Instituts für Technologie (KIT) genehmigte DISSERTATION von Dipl.-Chem. Kai Pahnke aus Nagold, Deutschland KIT-Dekan: Prof. Dr. Willem M. Klopper Referent: Prof. Dr. Christopher Barner-Kowollik Korreferent: Prof. Dr. Manfred Wilhelm Tag der mündlichen Prüfung: 22.07.2016 Die vorliegende Arbeite wurde im Zeitraum von Februar 2013 bis Juni 2016 im Rahmen einer Kollaboration zwischen dem KIT und der Evonik Industries AG unter der Betreuung von Prof. Dr. Christopher Barner-Kowollik durchgeführt Only entropy comes easy. Anton Chekhov ABSTRACT The present thesis reports a novel, expedient linker species as well as previously unforeseen effects of physical molecular parameters on reaction entropy and thus equilibria with extensive implications on diverse fields of research via the study of dynamic ligation chemistries, especially in the realm of macromolecular chemistry. A set of experiments investigating the influence of different physical molecular parameters on reaction or association equilibria is designed. Initially, previous findings of a mass dependant effect on the reaction entropy – resulting in a more pronounced debonding of heavier or longer species – are reproduced and expanded to other dynamic ligation techniques as well as further characterization methods, now including a rapid and catalyst- free Diels–Alder reaction. The effects are evidenced via high temperature nuclear magnetic resonance spectroscopy (HT NMR) as well as temperature dependent size exclusion chromatography (TD SEC) and verified via quantum chemical ab initio calculations. Next, the impact of chain mobility on entropic reaction parameters and thus the overall bonding behavior is explored via the thermoreversible ligation of chains of similar mass and length, comprising isomeric butyl side-chain substituents with differing steric demands. -
Pierre Samuel Du Pont De Nemours from the Executive Director
Summer 2017 - Vol. 46 No. 2 SAVE THE DATE Fireworks at Hagley June 16 & 23 Bike & Hike Wednesday Evenings June 7 through September 13 HagleyMAGAZINE Summer Camps 2016 ANNUAL REPORT July 10-14, July 31-August 4 Pierre Samuel du Pont de Nemours From The Executive Director Several months ago, I received a phone education system in Virginia. And speaking Executive Director David Cole call from a professor on the Faculty of Law of Jefferson, let’s not forget the crucial role at the University of Paris. He was calling to that du Pont de Nemours played as a behind- inform me that his university is planning a the-scenes broker of the Louisiana Purchase. Cover: Portrait of Pierre Samuel 2017 academic conference in commemoration Across oceans, political divides, and academic du Pont de Nemours on display in of the 200th anniversary of the death of disciplines, this gifted thinker was a true the Morning Room of Eleutherian duPont family patriarch, Pierre Samuel innovator—always eager to experiment in the Mills. The portrait was painted by du Pont de Nemours. This conference, he service of better living. Joseph Ducreux, court painter for Marie Antoinette, in Paris circa 1876. explained, will draw scholars from across the globe Back: Visitors enjoy biking on the and will invite a critical property during Bike & Hike on Across oceans, political summer Wednesday evenings. reappraisal of the intellectual contributions and legacy of divides, and academic this extraordinary figure of the French enlightenment. disciplines, this gifted I was delighted to have thinker was a true innovator. this news, as I have felt for some time that du Pont de Nemours’s life and career as Board of Trustees a philosopher, educator, political figure, and In 2017, Hagley will join the University of Henry B. -
Microstructure and Properties of Polytetrafluoroethylene Composites
coatings Article Microstructure and Properties of Polytetrafluoroethylene Composites Modified by Carbon Materials and Aramid Fibers Fubao Zhang *, Jiaqiao Zhang , Yu Zhu, Xingxing Wang and Yuyang Jin School of Mechanical Engineering, Nantong University, Nantong 226019, China; [email protected] (J.Z.); [email protected] (Y.Z.); [email protected] (X.W.); [email protected] (Y.J.) * Correspondence: [email protected]; Tel.: +86-13646288919 Received: 12 October 2020; Accepted: 16 November 2020; Published: 18 November 2020 Abstract: Polytetrafluoroethylene (PTFE) is polymerized by tetrafluoroethylene, which has high corrosion resistance, self-lubrication and high temperature resistance. However, due to the large expansion coefficient, high temperature will gradually weaken the intermolecular bonding force of PTFE, which will lead to the enhancement of permeation absorption and the limitation of the application range of fluoroplastics. In order to improve the performance of PTFE, the modified polytetrafluoroethylene, filled by carbon materials and aramid fiber with different scales, is prepared through the compression and sintering. Moreover, the mechanical properties and wear resistance of the prepared composite materials are tested. In addition, the influence of different types of filler materials and contents on the properties of PTFE is studied. According to the experiment results, the addition of carbon fibers with different scales reduces the tensile and impact properties of the composite materials, but the elastic modulus and wear resistance are significantly improved. Among them, the wear rate of 7 µm carbon fiber modified PTFE has decreased by 70%, and the elastic modulus has increased by 70%. The addition of aramid fiber filler significantly reduces the tensile and impact properties of the composite, but its elastic modulus and wear resistance are significantly improved. -
Country State Business
Spotted Lanternfly Permit Participants These Participants have been trained on and found to be compliant with standards listed in the Order of Quarantine and Treatment regarding Spotted Lanternfly for operating in the quarantine area. The companies listed here have agreed to participate in and comply with the terms and conditions of the Order of Quarantine and Treatment which is designed to stop the movement of Spotted Lanternfly within or out of the current quarantine zone. Country State Business Canada AB 1763579 ON INC Canada AB 624889 BC LTD Canada AB 9958169 CANADA INC/LOHGARH TRANSPORT Canada AB ADMIRAL MERCHANTS MOTOR FREIGHT Canada AB BCD AB TRANSPORT LTD Canada AB CANEDA TRANSPORT LTD Canada AB CARAVAN AB INC Canada AB CBS TRUCKING INC Canada AB CERTARUS LTD Canada AB CODE LOGISTICS LTD Canada AB DAY AND ROSS INC Canada AB GILBERT TRUCKING LTD Canada AB JJ TRANSPORT INC Canada AB LANDSTAR Canada AB LOADSAFE CROSSBORDER FREIGHT INC Canada AB LOADSAFE/SL TRANSPORT LTD Canada AB MULLEN TRUCKING CORP Canada AB NORD-DECK TRANSPORT INC Canada AB SNOWY OWL TRANSPORTATION Canada BC 1063282 BC LTD Canada BC BERRY AND SMITH TRUCKING LTD Canada BC I-5 LOGISTICS SERVICES LTD Canada BC INTERNATIONAL MACHINE TRANSPORT INC Canada BC KDMS HOLDINGS INC Canada BC LODEXO LOGISTICS INC Canada BC MAVEN TRANSPORT LTD Canada BC PISTON TRANSPORT LTD Canada BC POWERLANE LOGISTICS INC Canada BC SKY BLUE TRANSPORT Canada BC SRT LOGISTICS Canada BC SYER TRANSPORTATION SERVICES LTD Canada BC TEN FOUR TRUCKING Canada BC THE DAY & ROSS TRANSPORTATION GROUP -
Kevlar ® Life Protection Brand Brochure (PDF)
LP_brochure.qxd 10/16/03 6:19 PM Page 1 POWER OF PERFORMANCE LP_brochure.qxd 10/16/03 6:20 PM Page 2 INNOVATION & KEVLAR ® Realizing the power of performance Whatever the threat – a bullet from a gun, a slash innovation, as well. In law enforcement, DuPont has from an inmate’s shiv, or metal fragments from an developed new technology that helps provide cut, explosion – DuPont™ KEVLAR® helps protect law puncture, slash and ballistic protection. In enforcement personnel, corrections officers and the corrections, patented technology offers protection military. That’s because the protection of KEVLAR® from spikes, shanks, shivs and other handmade brand fiber is five times stronger than steel on an weapons typically found in prisons and jails. New equal weight basis, yet, at the same time, is light- technology for the military offers improved comfort The origins of KEVLAR® weight, flexible and comfortable. It provides proven and enhanced protection from a variety of threats. performance and proven strength. This powerful And, that’s not all. The successful ballistic protection DuPont’s goal to create an incredibly strong yet • Run-flat tires that allow for greater safety brand’s unique combination of attributes helps keep that is synonymous with KEVLAR® brand fiber is now lightweight and flexible fiber that could be offered because they won't ruin the rim when driving to wearers safe from harm that can come in many forms: being leveraged into several unique and exciting in a variety of products was realized by research the nearest assistance. knives, switchblades, shrapnel, explosives and applications that help deliver enhanced security and scientist Stephanie Kwolek. -
How to Choose the Best Drysuit?
HOW TO CHOOSE THE BEST DRYSUIT? 1. How to choose the best drysuit? If you care about comfort while diving, you want to dive longer and deeper, primarily derive from unlimited pleasure of being under water – bet on the drysuit. Drysuits have become increasingly popular among divers. Technical divers that often do wreck or technical diving, long and in colder waters know this perfectly well. Those who dive less often, they prefer the shorter diving in warmer waters are also increasingly inclined to opt for drysuits. Why? Because they give amazing comfort under water - we are dry, warm and comfortable. There are more benefits of their use. Drysuit insulates virtually 100% the diver’s body from the water. Thermal properties of the suit depend on the fabric which it is made of and warmer being used. It is used for all types of dives, especially in colder waters and during deep dives. It is also excellent in the course of diving, when an air temperature and water is very low, eg. Ice Diving. You could say that if we have a drysuit, diving season never ends. 2. 1. Benefits of drysuit ownership Comfort Drysuits give divers a great thermal comfort - both during long dives and after its completion. The diver is completely isolated from direct contact with water, so the body does not cool down so quickly. Protection and durability Drysuit provides not only comfort but also safety. Above all it is the first and most important protection against unfavorable underwater environment both in terms of thermics as in the mechanical influence. -
Effect of Stoichiometric Ratio on the Interfacial Polymerization Of
Effect of stoichiometric ratio on the interfacial polymerization of polyamides Why worry about polymer science? John Droske Polymer Education "Approximately 50% of all chemists will work with polymers at some time in their careers," says John Droske, professor of chemistry at the University of Wisconsin–Stevens Point and director of the POLYED National Information Center for Polymer Education. "Because polymer science touches on many areas, it is important for chemists to be trained in polymer science." The POLYED has been working with a National Science Foundation grant to develop materials for polymer chemistry courses at the undergraduate level. http://portal.acs.org/portal/acs/corg/content?_nfpb=true&_pageLabel=PP_ARTICLEMAIN &node_id=1188&content_id=CTP_003399&use_sec=true&sec_url_var=region1 Students should be exposed to the principles of macromolecules across foundation areas, which could then serve as the basis for deeper exploration through in depth course work or degree tracks ACS Guidelines for Undergraduate Professional Education in Chemistry http://portal.acs.org/portal/fileFetch/C/WPCP_008491/pdf/WPCP_0084 91.pdf What is a polymer (a.k.a macromolecule)? Poly-mer Two latin roots: πολυ (poly)? µεροζ (meros)? Polymers are everywhere (and we did not come up with the concept) Examples from nature: Examples from synthetic chemistry: http://pslc.ws/macrog.htm Commodity (most commonly used) recyclable plastics (Who is PETE?) Step growth polymerization The “polymer revolution” Wallace Carothers 1896-1937 B.S. Chemistry, Tarkio College, 1920 1930: Neoprene Ph.D. U. Illinois, 1924 1930: Polyesters Organic chemistry Instructor 1934: Polyamides Harvard U., 1926-1928 1935: Nylon Dupont’s Central Research & Development (1928-1937) 1938: Teflon (then 3 Ph.D. -
Mitteilungen Titelei
Mitteilungen Nr. 20 (2009) Beiträge H.-W. Schütt: Noch ein ‚Vorentdecker’ des Sauerstoffs: Abraham Eleazar ...... 3 H. Andreas: Friedlieb Ferdinand Runge: Wegbereiter der Teerfarbenchemie? ...................................................................... 9 M. Haustein, J. Zaun: Die Sammlung chemischer Präparate der TU Berg- akademie Freiberg – Clemens Winklers materielle Spuren ............ 23 W. Scheinert: Triphenylmethanfarbstoffe bei den Chemischen Fabriken vorm. Weiler-ter Meer und ihren Vorläuferfirmen ......................... 43 K.-D. Röker: Vulkanisation – chemische Reaktion oder Absorptions- vorgang? Eine Kontroverse zu Beginn des 20. Jhdts ...................... 68 R. Aust, Der schwierige Weg zum synthetischen Kautschuk – ein Weg mit Zufällen und Forschungsimpulsen ............................................ 83 H. Gilch: Die Erfinder von Nylon und Perlon: Wallace H. Carothers und Paul Schlack ............................................................................. 98 S. Niese: Mottenkugeln zum Nachweis der Kernstrahlung: Hartmut Kallmann (1896-1978) und die organischen Szintillatoren .......... 116 P. Löhnert: Richard May, Theodor Mariam, Oskar Falek: Schicksale jüdischer Chemiker in der Farbenfabrik Wolfen nach 1933 ......... 137 Dokumentation und Information G. Boeck: Ernst August Geitner (1783-1852) – Arzt, Chemiker, Metallurge, Erfinder und Unternehmer ......................................... 173 H. Stegemeyer: Vom Cholesterin zum Flachbildschirm: Eine Ausstellung zur Geschichte der Flüssigkristall-Forschung -
Kevlar Cut Protection Testing
DuPont™ Kevlar ® THE SCIENCE OF CUT PROTECtiON Industry standards groups have made tremendous progress in testing and measuring the cut protective performance of gloves and apparel. DuPont has been a pioneer and active contributor to these efforts. It is now commonplace to have a wide range of performance data available for any protective apparel under consideration. Although the availability of cut protection performance information is widespread, it is important to understand the different test methodologies in order to interpret the data and draw accurate conclusions. This guide is designed to help specifiers of protective apparel make informed decisions about cut protective apparel performance. As a result, specifiers should take the time to better understand the sources of information and the critical factors that influence cut protection. Recent changes to some of the test methods make this imperative. The keys to cut protection Basis weight (oz/yd2) Cut protection is a combination of many factors, not just Defined as the fabric weight per unit area, not the overall the material of construction. Therefore, all of the following glove weight. The higher the basis weight, the higher the factors should be carefully considered when assessing cut resistance because there is more material present. the cut-resistant properties of a glove, particularly if you are developing a product specification: Fabric construction Defined as the details of structure of fabric. Includes such Material of construction information as types of knit or weave, threads/stitches (Kevlar®, leather, cotton, steel, etc.) This has the per inch. This can affect yarn mobility and sample greatest impact on the cut resistance of personal thickness, which can affect cut resistance. -
Choosing the Right Gloves
NITRILE – offers superior resistance to snags, punctures, abrasions and cuts in the Applications for Nitrile Gloves: disposable glove arena. No latex allergens! Coated nitrile effectively replaces cotton Most Medical Environments CHOOSING in a broad range of dry and light applications. Additional advantages for coated nitrile Handling Small Sharp Objects offer excellent grip and are machine washable. Unsupported nitrile is an outstanding Automotive Assembly combination of strength for puncture and chemical resistance. Will not weaken or swell Handling Glass like rubber (latex) or neoprene in many solvents and animal fats. Chemical Usage Painting Environments NEOPRENE – offers a broad spectrum of protection providing excellent resistance to a Applications for Neoprene Gloves: T wide range of chemicals including oils, acids caustics and solvents as an unsupported Poultry and Food Processing HE RIGH glove. Reinforced neoprene coating provides better all-around resistance to abrasion, Chemical Manufacturing cutting and chemicals. Lining on a coated neoprene enhances puncture and snag Pharmaceutical Manufacturing resistance. VINYL – known as PVC (polyvinyl chloride) is available as a disposable, coated or Applications for Vinyl Gloves: T vinyl impregnated style. Vinyl disposables are economical, reusable or disposable. In Cleaning addition to offering excellent sensitivity, vinyl disposable gloves are chemical resistant Food Preparation G and ambidextrous. All value priced offering softness, flexibility and strength. Vinyl Light Industrial Usage LOVES coated is an inexpensive choice for applications where cut and abrasion resistances are needed. Rough PVC coat finish makes handling wet surfaces easier and safer. Vinyl impregnated gloves on an interlock knit liner stretches to a snug and sensitive fit, liquid repellent and provides superior grip.