Crystallization and melting of polycarbonate studied by temperature-modulated DSC (TMDSC)

Authors
Schick, C Wurm, A Merzlyakov, M Minakov, A Marand, H
Citation
C. Schick et al., Crystallization and melting of polycarbonate studied by temperature-modulated DSC (TMDSC), J THERM ANA, 64(2), 2001, pp. 549-555
Citations number
27
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences
Journal title
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
ISSN journal
13886150 → ACNP
Volume
64
Issue
2
Year of publication
2001
Pages
549 - 555
Database
ISI
SICI code
1388-6150(2001)64:2<549:CAMOPS>2.0.ZU;2-L
Abstract
Temperature-modulated DSC (TMDSC) measurements at reasonably high frequenci es allow for the determination of base-line heat capacity. In this particul ar case vitrification and devitrification of the rigid amorphous fraction ( RAF) can be directly observed. 0.01 Hz seems to be a reasonably high freque ncy for bisphenol-A polycarbonate (PC). The RAF of PC is established during isothermal crystallization. Devitrification of the RAF seems to be related to the lowest endotherm. For PC the melting of small crystals between the lamellae is expected to yield the lowest endotherm.