Chromate The Prefix word “poly” implies to the word many, but even ions of two atoms are usually referred to as polyatomic. Majority of the Polyatomic ions that are used with Oxygen will have the word “ate” in them. Nitrate is an example of a Polyatomic Ion. Polyatomic Ions are referred to as a radical, and less commonly, as a radical group. There are many differences between a polyatomic ion and a compound. Polyatomic ions are composed of two or more atoms that are linked to covalent…
Kevlor A synthetic material which has high tensile strength and used in manufacturing of tires and also as a reinforcement agent in manufacturing of protective parts like helmet etc…, HISTORY In 1930’s a chemical company called DuPont prepared commercially succeful super polyamide. Actually in 1964 Stephanie kwolek discovered kevlor in DuPont laboratory while doing research on the high performance chemical compounds. Kevlor is patented Stephanie kwolek in 1966 which is used by many police…
which increases the filler- matrix interaction, thus increasing the effect of the material properties [18]. According to Yang et al, nanocomposites have been shown to afford remarkable property enhancements compared to the conventional composite. Polymer nanocomposites with layered silicates and carbon nanotubes have attracted great interest for the improvement of structural properties and development of new materials with different functional properties [19]. Based on Potts et al, the…
QUESTION: Give the Preparation, Properties and Applications of any four POLYMERS 1. Polyethenics ( Vinyl Resins) They are obtained by the polymerization of monomers containing the ethylenic bond (-C=C-) I. Polyethylene ( PE ) Polyethylene is one of the simplest and most inexpensive polymers. It is a waxy, chemical inert plastic. It a thermoplastic formed by the addition polymerization of ethylene. There are two types of polyethylene Low Density polyethylene (LDPE) By using free radical…
thermal characteristics and withstands temperature upto 200 oC without any significant degradation. Characteristics such as transmittance (T), absorption (A), refractive index (n) and extinction coefficient (k) are also reported. Keywords: ); Flexible Polymer Substrate, Polydimethylsiloxane (PDMS), Thin Films, Organic Light Emitting diodes (OLEDs),Transmittance. 1. Introduction Organic light-emitting devices (OLED) have attracted…
objects which we use in our everyday lives such as phones, cars, cooking utensils, computers and shoes, (http://www.slideshare.net). Plastics are a group of material which can either be synthetic or naturally occurring. Plastics are considered as polymers a substance which has a molecular structure with a large number of units bonded together, (http://www.chemheritage.org). Most plastics are made from crude oil which is a liquid derived from petroleum, (http://science.howstuffworks.com).…
Topical ointments Introduction: An ointment is semi solid topical preparation applied to external application with rubbing effect. It may be a vehicle or media for a drug or it may serve like a protective or emollient. Ointments show plastic flow characteristics. When the ointment is applied it is definite yield value and the resistant to flow drops as the applications to the skin is continued. Body: • Uses : There are two types of ointments: A- Medicated: used to treat different…
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As a leading industrial seals distributor, Valley Seal provides Parker and Coorstek engineered sealing products. We at Valley Seal ensure a stock of the widest range of seals for customers to choose from. These include simple O-rings, rods wipers and scrapers, back-up rings, and custom molded rubber products. We also provide uniquely designed seals and fasteners from Parker. These sealing products will be discussed in this post. Three Uniquely Designed Parker Seals The seals and fastener…
Organic/Natural cosmetic products are not superior to chemical cosmetic products because chemical products can do things organic/natural cosmetic products cannot. Hairdresser Daniel Galvin said, “There is just no way to perm hair without chemicals…”(dailymail.co.uk). In order to perm hair, the hair cuticle must be penetrated and changed. The use of chemicals is the only known way to penetrate and change the cuticle of the hair.There is no organic or natural alternative that will allow for the…