Studies on the Crystallization and Melting Behavior of Poly(ethylene 2,6-naphthalate)
Titel:
Studies on the Crystallization and Melting Behavior of Poly(ethylene 2,6-naphthalate)
Auteur:
James, Nirmala R. Bhojegowd, E. Ramesh, C. Sivaram, S.
Verschenen in:
International journal of polymeric materials
Paginering:
Jaargang 50 (2001) nr. 3-4 pagina's 335-344
Jaar:
2001-10-01
Inhoud:
Crystallization behaviour of low molecular weight (oligomeric) and high molecular weight poly(ethylene 2,6-naphthalate)s (PEN) was studied using wide angle X-ray diffraction (WAXS) and differential scanning calorimetry (DSC). It was found that the crystallization conditions determine the nature of crystalline modification. Crystallization from the glassy state gives a-modification, whereas, crystallizing from the melt above 220°C results in β-modification. In contrast, the oligomers gives both the modifications up on crystallizing from the melt. The equilibrium melting temperatures of PEN were determined from DSC experiments, based on conditions of crystallization of a and β-modifications.