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Melting point
• Higher temperatures destroy the molecular
arrangement .
• Small crystals melt fast
• Sharp melting for uniform crystal size
General polyester structure:
[-O-R-O-CO- -CO-] n
Melting of Polyesters:
R Tp (C)
PET (-CH2-CH2-)n 265
PPT (-CH2-CH2-CH2-)n 228
PBT (-CH2-CH2-CH2-CH2-)n 225
(-CH2-CH-) Non crystalline
CH3
Structural Irregularities and Melting point
Nylon Type TmC
Nylon 3 330
Nylon 4 270
Nylon 5 265
Nylon 6 230
Nylon 7 230
Nylon 8 205
Nylon 9 210
Nylon10 185
Nylon11 195
Nylon12 180
Nylon13 185
Other nylons:
Nylon 6,6 270
Nylon 6T 370
Estimate the Tm range of Nylon 6 10 & nylon6 12
Influences of chain length of nylons on melting point
Melting temperature (Tm)
• The (Tm) when applied to polymers suggests
not a solid-liquid phase transition, but a
transition from a crystalline phase to a solid
amorphous phase. Crystalline melting is only
discussed with thermoplastics, as thermosets
will decompose at high temperatures rather
than melt.

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Melting point of polymer

  • 2.
  • 3. • Higher temperatures destroy the molecular arrangement . • Small crystals melt fast • Sharp melting for uniform crystal size
  • 4. General polyester structure: [-O-R-O-CO- -CO-] n Melting of Polyesters: R Tp (C) PET (-CH2-CH2-)n 265 PPT (-CH2-CH2-CH2-)n 228 PBT (-CH2-CH2-CH2-CH2-)n 225 (-CH2-CH-) Non crystalline CH3 Structural Irregularities and Melting point
  • 5. Nylon Type TmC Nylon 3 330 Nylon 4 270 Nylon 5 265 Nylon 6 230 Nylon 7 230 Nylon 8 205 Nylon 9 210 Nylon10 185 Nylon11 195 Nylon12 180 Nylon13 185 Other nylons: Nylon 6,6 270 Nylon 6T 370 Estimate the Tm range of Nylon 6 10 & nylon6 12 Influences of chain length of nylons on melting point
  • 6. Melting temperature (Tm) • The (Tm) when applied to polymers suggests not a solid-liquid phase transition, but a transition from a crystalline phase to a solid amorphous phase. Crystalline melting is only discussed with thermoplastics, as thermosets will decompose at high temperatures rather than melt.