Mn=∑niM/∑ni - Number Average Molecular Weight, Mw=(∑ni Mi2)/(∑ni Mi ) - Weight Average Molecular Weight, Addition polymerization - Occurs via chain reaction with initiators, Condensation polymerization - Involves elimination of small molecules like H₂O, Thermoplastic - Polyethylene, Thermosetting - Bakelite, Elastomer - Natural rubber, Linear polyme - Straight chain with minimal branching, Branched polymer - Side chains extending from main chain, Degree of Polymerization - Number of repeat units in a chain,

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