Volume 60, Number 3, November I 2002
|Page(s)||390 - 396|
|Section||Condensed matter: structural, mechanical and thermal properties|
|Published online||01 October 2002|
Crystallization of PDMS: The effect of physical and chemical crosslinks
The Reimund Stadler Minerva Center for Mesoscale Macromolecular
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: firstname.lastname@example.org
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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