Crystallization of Polymers and the Rigid Amorphous Fraction Studied by the Temperature-Modulated Techniques TMDSC and TMDMA / C. Schick, A. Wurm, M. Merzliakov
- Conference Author:
- Materials Characterization by Dynamic and Modulated Thermal Analytical Techniques (2000 : Toronto, Ontario)
- Physical Description:
- 1 online resource (15 pages) : illustrations, figures, tables
- Additional Creators:
- Wurm, A., Merzliakov, M., Schick, C., American Society for Testing and Materials, and ASTM International
- Restrictions on Access:
- Subscription required for access to full text. and License restrictions may limit access.
- Quasi-isothermal temperature-modulated DSC and DMA measurements (TMDSC and TMDMA, respectively) were performed to determine heat capacity and shear modulus as a function of time during crystallization. Non-reversible and reversible phenomena in the crystallisation region of polymers can be observed. The combination of TMDSC and TMDMA yields new information about local processes at the surface of polymer crystals, like reversible melting. Until now we have found only one semicrystalline polymer showing no excess heat capacity during crystallization, namelyBisphenol-A Polycarbonate (PC). This allows study of vitrification and devitrification of the rigid amorphous fraction in PC. For other polymers the fraction of material involved in reversible melting, which is established during main crystallization, keeps constant during secondary crystallization. Simply speaking, polymer crystals are ¿̐ưliving crystals.¿̐ư.
- Dates of Publication and/or Sequential Designation:
- Volume 2001, Issue 1402 (January 2001)
- 9780803154520 (e-ISBN), 9780803128873, and 0803128878
- Digital File Characteristics:
- text file PDF
- Bibliography Note:
- Includes bibliographical references 40.
- Other Forms:
- Also available online via the World Wide Web. Tables of contents and abstracts freely available; full-text articles available by subscription., Full text article also available for purchase., and Also available in PDF edition.
- Reproduction Note:
- Electronic reproduction. W. Conshohocken, Pa. : ASTM International, 2001. Mode of access: World Wide Web. System requirements: Web browser. Access may be restricted to users at subscribing institutions.
- Technical Details:
- Mode of access: World Wide Web.
- Source of Acquisition:
- ASTM International PDF Purchase price USD25.
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