Prof. Jin-Heong Yim Functional Polymer/1st Semester, 2006 Functional Polymer/1st Semester, 2006 History of Polymers History of Polymers Classification of Polymer Classification of Polymer By Polymerization Mechanism By Polymerization Mechanism By Polarity By Polarity By Polymerization Process By Polymerization Process By Recycle Ability By Recycle Ability By By Tacticity Tacticity Interaction of Polymer Interaction of Polymer
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New History of Polymers Classification of Polymer · 2006. 3. 15. · History of Polymer K. Ziegler (1898-1973) 상압폴리에틸렌합성 1963년Noble Prize G. Natta(1903-1979)
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InitiationInitiationGeneration of active initiatorGeneration of active initiatorReaction with monomer to form growing chainsReaction with monomer to form growing chains
PropagationPropagationChain extension by incremental monomer additionChain extension by incremental monomer addition
TerminationTerminationConversion of active growing chains to inert Conversion of active growing chains to inert polymerpolymer
Chain TransferChain TransferTransfer of active growing site by terminating one Transfer of active growing site by terminating one chain and reinitiating a new chain. chain and reinitiating a new chain.
Thermoplastic: Thermoplastic: polymers that flow when heatedpolymers that flow when heatedeasily reshaped and recycledeasily reshaped and recycleddue to presence of long chains with limited or no due to presence of long chains with limited or no crosslinkscrosslinkspolyethylene, polyvinylchloridepolyethylene, polyvinylchloride
Prof. Jin-Heong Yim
Thermosetting: Thermosetting: decomposed when heateddecomposed when heatedcan not be reformed or recycledcan not be reformed or recycledpresence of extensive presence of extensive crosslinkscrosslinks between long between long chains chains epoxy and polyestersepoxy and polyesters
By Recycle AbilityBy Recycle Ability
Prof. Jin-Heong Yim
ElastomersElastomers: : intermediate between thermoplastic and intermediate between thermoplastic and thermosetting polymers thermosetting polymers some some crosslinkingcrosslinkingcan undergo extensive elastic deformationcan undergo extensive elastic deformationnatural rubber, siliconenatural rubber, silicone