from which polymers are made • • • Ethylene is polymerised to polyethylene High pressures produce soft‚ low density polyethylene‚ consisting of tangled chains (with molecular masses 100‚000) 5) Identify polyethylene as an addition polymer and explain the meaning of the term Addition polymerisation: a process in which many identical small molecules combine to form one large molecule‚ with no by-products. The small molecules are called monomers‚ while the large molecule is called a polymer. H C C
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December 2). What is Polymerization? Retrieved from http://www.wisegeek.com/what-is-polymerization.htm Education planet Knowledgerush. (2009). Alkyne. Retrieved from http://www.knowledgerush.com/kr/encyclopedia/Alkyne/ Manisha Ophardt‚ C. E. (2003). Polymers. In Virtual Chembook. Polymerization – Definition‚ (2010). Retrieved from http://www.wordiq.com/definition/Polymerization P.S Scope of Organic Chemistry. (2008). Retrieved from http://www.tutornext.com/scope-organic-chemistry/ 14431 StasoSphere
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Objective: In the present study‚ an attempt was made to improve the bioavailability of Zidovudine by formulating into Orodispersible tablets‚ as it has poor bioavailability and extensive pre systemic metabolism. Methods: In the present study‚ the mucilage extracted from Fenugreek seeds (Trigonella foenum-graecum) was used as superdisintegrant. The oral dispersible tablets were prepared by using wet granulation technique. A three factor two level (23) central composite design was employed for the
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Imperial Oil (69‚6%) Mobil Mobil Producing Nigeria SeaRiver Maritime Superior Oil Company Vacuum Oil Company XTO Energy I.4 ExxonMobil Products Fuels: Lubrications: Petrochemicals: Gasoline‚ Diesel‚ Heating Oil‚ Kerosene etc Grease‚ Synthetic Oil etc Polymers‚ Films‚ Paints etc I.5 References http://en.wikipedia.org/wiki/ExxonMobil#Organization
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everyday life. Furthermore‚ the physical characteristic of plastic itself that are high resistance‚ durable‚ cheap and lightweight makes it suitable for production of a wide range of products category (Derraik‚ 2002). Basically plastics are synthetic organic polymers that are made from various chemical elements that mostly come from natural resources such as crude oil‚ gas and coal(Derraik‚ 2002). The raw materials of plastics were formed from ancient plants and animals hundreds of millions years ago
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is the chemical formula for PVC that consists of Carbon‚ Hydrogen and Chloride. PVC is a thermoplastic polymer meaning that is recyclable‚ the addition of the chlorine atom allow for easier identification during automated sorting systems and with today’s society being environmentally concise these become important properties. Other important properties of PVC that make it a desirable polymer are its resistance to chemicals and corrosion‚ good electrical and thermal insulator‚ fire retardant (burns
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Cancers affecting mankind To date‚ none of the approximately 60 anticancer drugs used in conventional chemotherapy exhibits a selective uptake in tumor tissue and generally only a very small fraction of the administered dose reaches the tumor site. If surgery or radiotherapy is not effective‚ cure rates are in the range of 10% and‚ as a consequence‚ 90 % of chemotherapeutic agents are administered in the palliative setting to stabilize the disease or to improve the quality of life. With such a
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CASSAVA STARCH AS A MAJOR COMPONENT IN MAKING BIODEGRADABLE PLASTIC ABSTRACT The purpose of this experiment is to be able to help the society with its environmental issues by creating biodegradable plastic out of cassava starch. The procedures that the researchers used in this investigatory project were all experimental and were based on Scientific Method. The researchers used environment-friendly materials which can be made into biodegradable plastics that will not harm the environment
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first developed by Gunther Von Hagens in 1977. In November 1979 Gunther applied for a German patent‚ proposing the idea of preservin animal and vegetable tissues permanently by synthetic resin impregnation. Since then‚ Von Hagens applied for further US patents regarding the work on preserving biological tissues with polymers. With the success of his patents‚ Von Hagens went on to form the Institute for Plastination in Heildelberg‚ German in 1993. The institute made their first showing of plastinated
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Why I chose this topic Are you bothered by stains? Some stains are very hard to get rid of; they require technique and proper knowledge to remove. The topic I investigated washing in what temperature of water removes stains the best. I came up with this when I saw this in one of the ideas for an experiment‚ and remembered the time when my brother stained his clothes while my mother was away. I thought about factors that could affect washing‚ and realized I never really cared about the temperature
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