The dynamic relaxation characteristics of short-branch rubbery amorphous networks prepared by the photopolymerization of poly(ethylene glycol) diacrylate [PEGDA] crosslinker have been investigated using dynamic mechanical analysis and broadband dielectric spectroscopy. Copolymerization with low molecular weight acrylates was used to control effective crosslink density in the networks and led to the insertion of ethylene oxide pendant groups along the network backbone. Substantial differences in the sub-glass and glass-rubber relaxation properties of the copolymers were observed as a function of pendant length and the nature of the pendant terminal group (e.g., -OH vs. -OCH3); the results are compared with prior studies on model copolymers containing longer, more flexible side branches.
|Number of pages||13|
|State||Published - Nov 30 2007|
Bibliographical noteFunding Information:
This work was supported in part by a grant from the Kentucky Science and Engineering Foundation as per Grant Agreement KSEF-148-502-05-130 with the Kentucky Science and Technology Corporation. In addition, we are pleased to acknowledge funding from the National Science Foundation Research Experiences for Undergraduates Program administered through the University of Kentucky Center of Membrane Sciences (DMR-0453488). Activities at the University of Texas were supported by the National Science Foundation under grant number CBET-0515425.
- Dielectric spectroscopy
- Dynamic mechanical analysis
- Poly(ethylene oxide)
ASJC Scopus subject areas
- Organic Chemistry
- Polymers and Plastics
- Materials Chemistry