Melting point of polymer

MELTING POINT OF POLYMER

1. Melting point

2. Higher temperatures destroy the molecular arrangement  . Small crystals melt fast Sharp melting for uniform crystal size

3. General polyester structure: [-O-R-O-CO- -CO-] n Melting of Polyesters: R T p (  C) PET (-CH 2 -CH 2 -) n 265 PPT (-CH 2 -CH 2 -CH 2 -) n 228 PBT (-CH 2 -CH 2 -CH 2 -CH 2 -) n 225 (-CH 2 -CH-) Non crystalline CH 3 Structural Irregularities and Melting point

4. Nylon Type T m  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

5. 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.