Classification Of Polymers, Cellulose, Starch, And Rubber

ïÆ'Ëœ Polymers they are combined form small units of compound having low molecular weight, as a wall is made up of bricks. ïÆ'Ëœ The word ‘polymer’ is taken from two Greek words poly states many and (mer) means unit or part. ïÆ'Ëœ The term polymer is defined as very large molecules having high molecular mass. These are also referred to as macromolecules, which are formed by joining of repeating structural units on a large scale. ïÆ'Ëœ The repeating structural units are derived from some simple and reactive molecules known as monomers and are linked to each other by covalent bonds. ïÆ'Ëœ This process of formation of polymers from respective monomers is called polymerization. (2)Types of Polymers There are several ways of classification of polymers based on some special considerations. The following are some of the common classifications of polymers: Under this type of classification, there are three sub categories. ïÆ'Ëœ (2,1,1)-Natural polymers these polymers are found in plants and animals. Examples are proteins, cellulose, starch, and rubber. ïÆ'Ëœ (2,1,2)- Semi-synthetic polymers Cellulose derivatives as cellulose acetate (rayon) and cellulose nitrate, etc. are the usual examples of this sub category. ïÆ'Ëœ (2,1,3)- Synthetic polymers A variety of synthetic polymers as plastic (polythene), synthetic fibers (nylon 6,6) and synthetic rubbers (Buna - S) are examples of manmade polymers extensively used in daily life as well as in industry. There are three different types based on theShow MoreRelatedPolymers And Their Monomer Units1444 Words   |  6 Pagesabout polymers and their monomer units. Polymers are substances containing a large number of structural units joined by the same type of linkage. The small molecules that make up these polymer chains are called monomers. Polymers in the natural world have been around since the beginning of time and are found many places in nature. Starch, cellulose, and rubber all possess polymeric properties. Cellulose and starch are actually polymers of glucose which is a monosaccharide. Man-made polymers (alsoRead MorePhase Behavior : Melting Point1898 Words   |  8 Pages PHASE BEHAVIOR:- Melting Point:- The temperature at which polymer transmit into crystalline form to determine the melting point. The polymer of low-molecular substance exist very low melting point and this happened when polymer chain is dispersed. In physical state melting point is very difficult to calculate. Polymer will decompose at high temperature rather than melts. It is also known as crystalline melting temperature. Glass TransitionRead MoreNatural and Synthetic Materials2539 Words   |  11 Pagesis then used in a series of methods that include, stitching, knitting and weaving in order to produce a fabric. The content, construction and finish of a fabric can determine it’s aesthetic and functional qualities. This essay will explore the classifications and characteristics of fibres, yarns and fabrics, expanding on colouration and finishing techniques. (Udale, 2008)(Hallet Johnston, 2010)(BBC Bitesize, 2011) Natural fibres are produced and obtained from plants and animals; they are 100% biodegradableRead MoreA comparison of the respiration of yeast in different sugar substrates.4520 Words   |  19 Pagesmonosaccharide (glucose) and a disaccharide (maltose) Theory: There are three types of Carbohydrates, monosaccharides, disaccharides, and polysaccharides. 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