The effect of physical and chemical crosslinks on the crystallization of PDMS Conference Paper uri icon

abstract

  • The effect of entanglements, chemical crosslinks, and tethering to rigid endblocks on the structure of PDMS melts was investigated. 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 vinyl- terminated PDMS chains results in the formation of a cross-linked network. Comparison of the thermograms obtained for each of these systems with their non-crosslinked analogues indicates that the different types of crosslinks result in an increased crystallization tendency. For each of these systems we observed an enhanced tendency towards crystallization …

publication date

  • January 1, 2002