Issue |
Europhys. Lett.
Volume 60, Number 3, November I 2002
|
|
---|---|---|
Page(s) | 390 - 396 | |
Section | Condensed matter: structural, mechanical and thermal properties | |
DOI | https://doi.org/10.1209/epl/i2002-00276-4 | |
Published online | 01 October 2002 |
Crystallization of PDMS: The effect of physical and chemical crosslinks
1
The Reimund Stadler Minerva Center for Mesoscale Macromolecular
Engineering
2
Max-Planck-Institut fur Polymerforschung -
Ackermannweg 10 55128 Mainz, Germany
3
Department of Chemical Engineering,
Ben-Gurion-University of the Negev Beer-Sheva, 84105, Israel
Corresponding author: rachely@bgumail.bgu.ac.il
Received:
22
April
2002
Accepted:
19
August
2002
Calorimetric studies of the crystallization behavior of physically and chemically crosslinked semicrystalline polymer, polydimethylsiloxane (PDMS) are presented. Physical crosslinks are introduced either via entanglements in high-molecular-weight PDMS, or by anchoring chain ends to rigid polyethylene oxide (PEO) endblocks in a PEO-b-PDMS-b-PEO triblock copolymer. Chemical end-linking of di-vinyl PDMS chains results in the formation of a crosslinked network. Comparison of the thermograms obtained for each of these systems at constant cooling/heating rates with their noncrosslinked analogues indicates that, contrary to conventional wisdom, the different types of crosslinks result in an increased crystallization tendency. We suggest that this effect is a manifestation of the enhancement of local ordering together with reduced dynamics as compared to the non-crosslinked melt.
PACS: 61.25.Hq – Macromolecular and polymer solutions; polymer melts; swelling / 68.35.Md – Surface thermodynamics, surface energies
© EDP Sciences, 2002
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