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| Titel: |
UNIAXIAL EXTENSION OF POLY(DIETHYLSILOXANE) NETWORKS: MESOPHASE FORMATION UNDER STRESS |
| Auteur: |
Papkov, V. Turetski, A. Out, Geradus. J. Moller, Martin |
| Verschenen in: |
International journal of polymeric materials |
| Paginering: | Jaargang 51 (2002) nr. 4 pagina's 369-391 |
| Jaar: |
2002-04 |
| Inhoud: |
The mesophase formation in chemically well-defined poly(diethylsiloxane) [PDES] networks has been investigated upon uniaxial extension by means of stress-strain and birefringence measurements. Variation of the temperature range of the mesomorphic state was shown to depend on the molecular weight between crosslinks, M c , and the applied stress. Formation and behavior of mesocrystals under stress can be described qualitatively within the framework of the crystallization thermodynamics and kinetics in stretched rubber. A particular feature of the mesophase formation in PDES networks under stress is that, at the initial stage of extension, metastable mesocrystals form with sizes smaller than M c that can reorganize on further extension into larger crystallites with a longitudinal size and isotropization temperature that is determined by M c . This transformation process is the cause of a peculiar stress-strain behavior of PDES networks on extension and subsequent contraction. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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