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Crystallization of PDMS The effect of physical and chemical crosslinks

MPG-Autoren
http://pubman.mpdl.mpg.de/cone/persons/resource/persons47798

Dollase,  T.
MPI for Polymer Research, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons48786

Spiess,  Hans Wolfgang
MPI for Polymer Research, Max Planck Society;

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Zitation

Dollase, T., Spiess, H. W., Gottlieb, M., & Yerushalmi-Rozen, R. (2002). Crystallization of PDMS The effect of physical and chemical crosslinks. Europhysics Letters, 60(3), 390-396.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-000F-64B2-5
Zusammenfassung
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.