A new approach for estimating the recrystallization rate and equilibrium melting temperature

✍ Scribed by Hong Gyun Kim; Richard E. Robertson

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 299 KB
• Volume: 36
• Category: Article
• ISSN: 0887-6266
• DOI: 10.1002/(sici)1099-0488(19980115)36:1<133::aid-polb15>3.0.co;2-d

✦ Synopsis

A method is described for measuring the heat and rate of recrystallization following partial melting. The method uses a specific sequence of temperatures with a differential scanning calorimeter, and the melting and recrystallization processes were confirmed by optical observations. The method was applied to poly(butylene terephthalate). The rate of recrystallization was found to be roughly two orders of magnitude faster than isothermal crystallization from the melt. The melting temperatures obtained from recrystallization were used in the Hoffman-Weeks equation to deduce 236ЊC as the equilibrium melting temperature for poly(butylene terephthalate). ᭧ 1998