PlasticPolymers

PlasticPolymers - Classification of polymers Thermoplastic...

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Classification of polymers Thermoplastic polymers : can be softened by heat and pressure and then reshaped. (LDPE, HDPE, PVC, PP, PS, PET, polyester, nylon) Thermosetting polymers : harden permanently when formed. They cannot be softened by heat and remodeled; instead, strong heating causes them to discolor and decompose. (Phenolic resins, Epoxy resins, Melamine) Condensation polymerization (PET, polyester, nylon) Two different monomers: co-polymer (e.g., ethylene glycol and terephthalic acid for PET) Each monomer is bi-functional : two functional groups per molecule (e.g., ethylene glycol is a dialcohol , and terephthalic acid is a diacid ) Addition polymerization (LDPE, HDPE, PVC, PP, PS) + 2 H 2 O Growing PET polymer + Ethylene glycol (a dialcohol) Terephthalic acid (a diacid) H 2 O +
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: natural polymers formed by condensation polymerization of amino acids . R : combination of C,H, and sometimes O, N, or S R determines the identity of the amino acid. Polyamides
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This note was uploaded on 02/24/2011 for the course CHEM 004 taught by Professor Zysmilich during the Spring '06 term at GWU.

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PlasticPolymers - Classification of polymers Thermoplastic...

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