The effect of heating rate on the melting of polytetrafluoroethylene

✍ Scribed by Starkweather, Howard W.

• Publisher: Wiley (John Wiley & Sons)
• Year: 1985
• Tongue: English
• Weight: 338 KB
• Volume: 23
• Category: Article
• ISSN: 0098-1273
• DOI: 10.1002/pol.1985.180230609

✦ Synopsis

Abstract

When virgin polytetrafluoroethylene is heated at intermediate rates, two melting peaks are observed. As the heating rate is increased, the higher‐temperature peak grows at the expense of the lower‐temperature one without any significant change in the total heat of fusion. It is suggested that the higher‐temperature peak represents a transition to a strained melt which subsequently changes to the more stable equilibrium melt. After recrystallization from the melt, there is only a single melting peak which occurs at a lower temperature than peaks for the virgin polymer. All of these transitions are subject to superheating.