User:Acetamilnadu/sandbox

Name : Gowtham Kumar.C Year : 2013 -2014 Branch : B.Tech Department : IT College : Arunai College Of Engineering

POLYMERS DEFINITION: The process of large number of micro molecule combines to form a macromolecule. Micro molecule ↓					       Monomer ↓				        Degree Polymerisation Example:   (CH2=CH2)n → (CH2-CH2-)n TYPES OF POLYMERS: There are 3 types, 1.	Addition Polymerisation 2.	Condensation Polymerisation 3.	Co-Polymerisation `ADDITION POLYMERISATION: It is the reaction that yields a multiple original monomeric molecule. Example: Polyethylene produced from ethylene (CH2=CH2)3 → (CH2-CH2-CH2-CH2-CH2-CH2-)3 CONDENSATION POLYMERISATION: It is a reaction between simple polar groups containing monomers with the formation of polymer and elimination of small molecules like H2O and so on. Example: Hexamethylene diamine and adipic condense to form a polymer, Nylon 66. nH2N-(CH2)6-NH2 + nHOOC-(CH2)4-COOH → -[HN-(CH2)6-NH-C=O-CH2)4-C=O]-

CO-POLYMERISATION : It is the joint Polymerisation in which two or more different monomers combine to form a polymer. Example: Butadiamine and styrene copolymerize to form GR-S rubber. CH2=CH-CH=CH2 + CH2=CH-CH-C6H5 → (CH2-CH=CH-CH2-CH2-CH-C6H5)- HIGH POLYMER : Polymer with high degree of polymerization is called high polymer. Its molecular weight range from 10,000 – 2,00,000 lkhs

OLIGO POLYMER : Polymer with low degree of polymerization is called oligo polymer. Its molecular weight range from 500 – 5000.