Polytetrafluoroethylene Essays

“Upon checking a frozen, compressed sample of tetrafluoroethylene, he and his associates discovered that the sample had polymerized spontaneously into a white, waxy solid to form polytetrafluoroethylene.” (History of Teflon, year) Polytetrafluoroethylene, PTFE, more commonly known as Teflon was not invented, meaning it was made for a reason, but discovered by accident by Dr. Roy Plunkett in 1938. Teflon is one of the many serendipitous discoveries that have become very helpful and used frequently

Teflon was discovered by Dupont chemist. When Dr Roy J. Plunkett use polytetrafluoroethylene to make an experiment with chemical refrigerants, he tries to pump the gas tetrafluoroethylene into hydrochloric acid and he does not see anything happen in the outside. When he hold the cylinder that contain tetrafluoroethylene, he sees the cylinder still heavy. After that, he thinks it is a good idea to cut the cylinder to see what happen in the inside . When he cut it out, he sees the tetrafluoroethylene

Aside from this reaction, there are also two main industrial processes which are used to synthesize this polymer. Manufacturers first begin by synthesizing tetrafluoroethylene (TFE) by amalgamating fluorspar, hydrofluoric acid, and chloroform. These three ingredients are then combined in a chemical reaction chamber which is heated from 590-900 °C. The resultant gas is then cooled and distilled in order to remove any impurities. From there tetrafluoroethylene undergoes either suspension or dispersion

in the arm, leg or chest and threaded through the vain until it reaches a larger vein near the heart. Venous catheters are used to give long-term medicine or large amounts of blood or fluid to the patients. Most catheters are composed of polytetrafluoroethylene (Teflon), polyurethane, polyethylene or polyvinyl chloride. Teflon catheters have been associated with fewer infectious complications than the other materials used. Catheters are usually coated with an antimicrobial or antiseptic agent such

Is a pen really mightier than the scalpel? One of the most crucial aspects of cancer diagnosis and treatment is to determine the thin boundary between the lesional and normal tissues. So it is important to assess an accurate negative margin and to completely excise the tumor for a prolonged disease free state and increase the overall survival of the patient. The conventional method for margin assessment is histopathological analysis which is labor-intensive, time-intensive and requires expertise

one of the main reasons for its success. Task environment and tasks The company is organized into four divisions; fabric, medical, industrial, and electronic products. For almost all products in every division the main basic material is Polytetrafluoroethylene (PTFE). The dependency on PTFE is one of the weaknesses of Gore. An increase of material costs, the availability of a comparable low cost or technically superior substitute will have major impact on the company. Business units are small,

Conclusion 5 References 6 Case Summary W. L. Gore & Associates, Inc. (1958) in Newark, Delaware; with Wilbert Gore and Genevieve Gore as its founders is a company that produces products for health care and leisure industries using polytetrafluoroethylene (PTFE). This private enterprise has its offices in more than 25 countries apart from the US and has an employee strength of over 10,000. Gore has earned several

Membrane separation technologies are among the most promising processes in water purification regarding their low energy consumptions. Membrane distillation (MD) is a thermally driven separation process in which liquid feed is evaporated at the feed/membrane interface and is transported through a hydrophobic microporous membrane[1–4]. The hydrophobic character of the membrane allows only volatile components to enter the pores. The differences of the vapour pressures across the membrane is the driving

Title: Introduction of a Flexible Polymeric Heart Valve Prosthesis with Special Design for Mitral Position Layman-friendly summary: The traditional method to replace the damaged heart valve is using mechanical valve or biological valve. Mechanical valve can be last long but blood-thinning medicines need to be taken for the rest of the person’s life to prevent blood clotting around where the mechanical valve placed. Heart valve prostheses are introduced with The mitral valve lies between the left

Barrier membrane: Generally, there are two types of membrane used, resorbable and non resorbable. Non resorbable expanded polytetrafluoroethylene(ePTFE) membrane can be used to maintain the alveolar ridge after extraction. A paper by the Lekovic V et al, looked at the use of a resorbable membrane compared to a control site in 16 patients. A polyglycolide⁄ lactide membrane was placed and assessed after six months. The experimental sites showed significantly