Crystallization of PDMS: The effect of physical and chemical crosslinks

T. Dollase, H. W. Spiess, M. Gottlieb, R. Yerushalmi-Rozen

Research output: Contribution to journalArticlepeer-review

103 Scopus citations


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.

Original languageEnglish
Pages (from-to)390-396
Number of pages7
Issue number3
StatePublished - 1 Nov 2002

ASJC Scopus subject areas

  • Physics and Astronomy (all)


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