Page 1 UNIVERSITY OF NAIROBI Lecture 2 Polymers •Bonding & Structure •Properties & ApplicationsUNIVERSITY OF NAIROBI PolymersAre Organic compounds consisting of giant molecules with the backbone of carbon "poly“ means "many” and “mer” means "parts” Polymers are composed of many repeated units called monomers -C-C-C-C-C- TWO types of polymers - Synthetic & Natural 4/6/2017 3:56 PM FWN_UoN 2 Monomer
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Page 2 UNIVERSITY OF NAIROBI Natural polymers Are derived from plants and animals and are fundamental to biological function e.g. Polysaccharides, wood, cotton, leather, silk, DNA, etc DNA double Helix biopolymerUNIVERSITY OF NAIROBI Sugar Proteins Starch Cotton Cotton contains Cellulose.Cellulose is a primary constituent of wood and paper.
Page 3 UNIVERSITY OF NAIROBI Synthetic Polymers Plastics -PVC, Polyethylene, Polyester, Rubber, Nylon 4/6/2017 3:56 PM FWN_UoN 5 PVC Polyester in fabrics UNIVERSITY OF NAIROBI Polymer Families Generally, polymers may be represented in the form Replacing R with H gives simple hydrocarbons i.e., the paraffin family (CnH 2n+2) e.g Methane (CH4), Replacing H with