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Natural Polymer Research Paper

1578 Words7 Pages

Polymer is large molecule formed from the merger of many small molecules known as monomer. The word polymer is derived from the Greek word Poly, which means “many” and Mer, which means “parts”. There are 2 types of polymer: natural polymer and synthetic polymer. The history of natural polymer goes back as long as man has been using wood, which composed of cellulose. Natural polymers exist in nature and can be extracted. Examples of natural polymers are cellulose, starch, glycogen, protein and nucleic acid.
Cellulose
Cellulose is the most abundant organic compound on earth. A pure form of cellulose compound is cotton. Cellulose also contained in woody parts of trees, supporting materials in plant and leaves.
Starch
Starch, known as polysaccharide …show more content…

The amount of unsaturated compounds such as alkenes make addition polymerization can be conducted in the presence of peroxides such as benzoyl peroxide or acetyl peroxide with high temperature and pressure. Peroxide generates free radicals that react with ethylene to form other radicals, which play a role in the propagation stage of forming the polymer chain. The combination of the polymer chain by radical terminated when the reagent runs out. For example, the polymerization of ethylene forming polythene followed by free radical polymerization. The reaction may take place at temperature 350-380k and a pressure of from 1000 to 2000 atm in the presence of benzoyl peroxide as an …show more content…

In the polymerization of cellulose, two glucose monomers join, condensing the water molecules and then releasing oxygen atoms that connect the two monomers. This process continues to form a chain.

Characteristics of polymers are based on the following four properties: polymer chain, intermolecular forces, branching and crosslinking. The length of polymer chain is very important in determine the flexibility and toughness of polymer. The strength and melting point is higher in a polymer with longer polymer chain The intermolecular forces are the forces of attraction and repulsion between monomers that make up the polymers. The polymer is stronger and more difficult to melt in the compound that have greater intermolecular forces. Polymer has branches when there are side chains attached to the main chain. Polymer chain that have many branches will have lower strength and is lower melting point. Crosslinking happens when all the polymer chains tied together to formed bridges until all the chains are joined into one large molecule. Crosslinking makes polymer to have more strength and higher melting point. It also make the polymer less flexible and cannot be easily

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