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GENERAL CHARACTERISTIC OF POLYMERIC MATERIALS (PRINCIPLE OF STRUCTURE…
GENERAL CHARACTERISTIC OF POLYMERIC MATERIALS
DEFORMATION BHAVIOR
3 TYPES OF DEFORMATION:
VISCOELASTIC
VISCOUS
ELASTIC
POLYMERIC MATERIALS
ARE VISCOELASTIC
2 COMPONENTS
ELASTIC:HOOKE'S LAW
VISCOUS:NEWTON'S LAW
MECHANICAL MODEL
KEVIN OR VOIGT
STANDARD LINEAR SOLID
MAXWELL
PRINCIPLE OF STRUCTURE
MACROMOLECULAR STRUCTURE:
1.LINEAR
2.BRANCHED
3.CROSSLINKED
4.ENTANGLED
TERMS:
POLYMER:REPEATING UNITS FROM ONE OR MORE MONOMER
MACROMOLECULAR:A STRUCTURE OF COVALENTLY BOUND MONOMER
PLASTIC:SYNTHETIC MATERIALS WITHOUT REGARD FOR THE STRUCTURE AND THE REACTION NECESSARY FOR THE SYNTHESIS
ISOMERISM:WHEN TWO OR MORE POLYMER MOLECULES HAVE THE SAME COMPOSITION BUT DIFFERENT ATOMIC ARANGGEMENT
TWO TYPES OF ISOMERISM
STEREOISOMERISM
SYNDIOTACTIC
ATACTIC
ISOTACTIC
GEOMETRICAL
CIS
TRANS
REPEAT UNITS
HOMOPOLYMER
COPOLYMER
ALTERNATING
BLOCK
RANDOM
GRAFT
CLASSIFICATION OF POLYMER(THERMAL RESPONSE)
THERMOPLASTIC
THERMOSET
ELASTROMERS
THERMOPLASTIC ELASTROMER
CROSSLLINKED/NETWORK POLYMER:
ELASTROMER
THERMOSET
MATERIALS STATE AND TRANSITION REGION
a)GLASSY STATE
b)RUBBERY
a)Tg
b)Tm
TRANSITION DETECTABLE:
a)DIFFERENTIAL SCANNING CALORIMETRY(DSC)
b)DYNAMIC THERMAL-MECHANICAL ANALYSIS(DMTA)