Dupont Chemical Company

Nylon 66 was the first polyamide to be produced commercially. Developed by Wallace Carothers at the DuPont Chemical Company In 1935, it still leads the polymer industry in annual production. Figure 13-7 illustrates that Nylon 66, made from adipic acid and hexamethylenediamine, is so easy to make that it is often used for a classroom demonstration ... 

There are numerous natural contributors of chlorine to the stratosphere, for example, volcanic eruptions. The main concern regarding ozone destruction in recent years is associated with human activities that have increased chlorine and other synthetic chemical input into the stratosphere. At the top of the list of such chemicals are chlo-rofluorocarbons, or CFCs. CFCs are compounds that contain carbon, chlorine, and fluorine they were first developed in 1928. Common CFCs are called Freons, a trade name coined by the DuPont chemical company. CFC compounds are nonreactive, nontoxic, inflammable gases. Because of their... 

In a hush-hush meeting the military asked the DuPont chemical company to present them with a material that was up to the task. Certainly, the military did not expect the DuPont people to accomplish this overnight. But somehow they did. That s because DuPont already had such a material — and it was a material that they hadn t known what to do with. In 1938 Teflon had been discovered by a young DuPont chemist named Roy Plunkett in the most curious fashion. 

In 1952, neither Purcell nor Bloch could have predicted the ways their discovery would advance understanding of solids, of the structure of chemical molecules, and even more. In fact, a representative from Dupont Chemical Company visited Purcell soon after the paper announcing the discovery was published. The Dupont scientist asked Purcell what the practical applications of NMR might be. Purcell responded that he could see no practical applications. In this, Purcell was very wrong (see Figure... 

Serendipity plays a big part in scientific research. The term serendipity means a discovery made by accident. One of the most profitable discoveries made this way is the material Teflon. The name Teflon is the trade name of a type of plastic made by the DuPont Chemical Company. It has become an important commercial product for one main reason very few things stick to Teflon. Most kitchen cupboards probably contain skillets and other pans with cooking surfaces covered with Teflon. Most food will not stick to Teflon-covered pans as it cooks. And foods cooked in Teflon pans need no oil or butter. 

The LOPE S were obtained from Monsanto (LDPE-M8011) and Dow Chemical (LDPE-493C) the poly(ethylene-co-methacrylic acid)) (Nucrel -1214) and ionomers (Surlyn -8660 and Surlyn -9950) were graciously provided by the Dupont Chemical Company. 

By 1923, leaded gas was being pumped at Dayton, Ohio. By the following year, GM, DuPont Chemical Company (which controlled about a third of GM s stock) and Standard Oil of New Jersey, combined their various patents and produced leaded gasoline under the Ethyl brand name. 

I would like to thank Dr. George W. Coulston (DuPont), Mr. P. S. Venkataraman (Virginia), Dr. David A. Dixon (Pacific Northwest Laboratories), Dr. William D. Provine (DuPont), Dr. Carlonda Reilly (DuPont), Dr. Jan J. Lerou (DuPont), Dr. Kerwin Dobbs (DuPont), Mr. David Kragten (Eindhoven University of Technology)., and Professor Rutger A. van Santen (Eindhoven University of Technology) for their helpful technical discussions. I would also like to thank DuPont Chemical Company and the Donors of the Petroleum Research Fund of the American Chemical Society for their financial support of this work. 

Materials. VEC was prepared by the catalyzed addition of CO2 to 3,4-epoxy-l-butene using conditions typical of that used industrially [77], then purified by vacuum distillation. Other raw materials were used as received without any additional purification. Mixed xylenes, vinyl acetate (VA), butyl acrylate (BA), butyl methacrylate (BMA), methyl methacrylate (MMA), styrene (St), and t-butyl hydroperoxide were obtained from Aldrich Chemical Company. Lupersol 575 (t-amyl peroxy (2-ethylhexanoate)) was supplied by Elf Atochem. Vazo 67 (2,2 -azobis(2-methylbutyronitrile)) was obtained from DuPont Chemical Company. Vinyl pivalate (NE05), vinyl 2-ethylhexanoate (V2EH), Tergitol NP-40 (non-ionic surfactant) and QP-300 (hydroxy ethyl cellulose) were obtained from Union Carbide Coq)oration. Aerosol OT-75 (surfactant) was obtained from Cytec. Sodium formaldehyde sulfoxylate was obtained from Henkel Corporation. Ethyl 3-ethoxy propionate (EEP), propylene glycol monomethyl ether (PM) and PM acetate (PM Ac) are Eastman Chemical Company products. 

Harvard Universlty-DuPont Company ( ). In September 1981, DuPont Chemical Company announced that it will give Harvard Medical School a 6 million grant to support molecular genetic research. The research will be done by the medical school s new Genetics Department, which is headed by Dr. Philip Leder. 

We would like to thank Dow Chemical Company, DuPont Chemical Company, and the National Science Foundation for the financial support of this work. 

Processes Using Sulfuric Acid as the Catalyst. The process designed by Stratco, Inc., more than 50 years ago has experienced numerous modifications since then. In addition, Stratco was purchased by the DuPont Chemical Company several years ago and is now frequently referred to as DuPont-Stratco. In about 2001, 34% of all alkylates produced in the world was in a Stracto unit (3). A somewhat higher percentage is probably now produced on the basis of published information found in Hydrocarbon Processing. 

One chemist who contributed greatly to the understanding of polymers as giant molecules was Wallace H. Carothers of the DuPont Chemical Company. Among his accompfishments was the preparation of nylon. The nylon story further illustrates the importance of serendipity in scientific research. When nylon is first prepared, the resulting product is a sticky material with little structural integrity. Because of this, it... 

In 1928, an organic chemist at Harvard, Wallace Carothers, was appointed to the director of organic research lab at the DuPont Chemical Company. He led a team to study polymers, the chemistry of which was just emerging. In 1938, he and his team... 

Current address Sabine River Laboratoiy, DuPont Chemical Company, P.O. Box 1089 (FM-1006), Orange, TX 77631-1089... 

According to Ref. [49] two commercial random copolyesters. Titan and Zenith 6000, were obtained from the Eastman and DuPont Chemical companies, respectively. These LCP have very narrow time and temperature intervals between the beginning of crystal melting and the onset of polymer degradation, where the liquid crystalline phase exists. The existence of multidomains in these commercial thermotropic LCPs has not been reported, and because of short time processing, it seems to be improbable. 

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