389957 Structure and Transport Properties of Highly Resilient Networks

Thursday, November 20, 2014: 9:30 AM
International 10 (Marriott Marquis Atlanta)
Erika Saffer1, Melissa Lackey1, David Griffin1, Suhasini Kishore1, Gregory N. Tew2 and Surita Bhatia3, (1)University of Massachusetts Amherst, Amherst, MA, (2)University of Massachusetts, Amherst, MA, (3)Chemistry, Stony Brook University, Stony Brook, NY

Polymer networks are critically important for numerous applications including soft biomaterials, adhesives, coatings, elastomers, and gel-based materials for energy storage. One long-standing challenge these materials present lies in understanding the role of network defects, such as dangling ends and loops, developed during cross-linking. These defects can negatively impact the physical, mechanical, and transport properties of the gel. Here we report the structure and transport properties of chemically cross-linked poly(ethylene glycol) (PEG) and PEG-PDMS gels formed through a unique cross-linking scheme designed to minimize defects in the network. Small-angle neutron scattering (SANS) was utilized to investigate the network structures of gels in both D2O and d-DMF. The highly resilient mechanical properties of these systems, results from SANS, and diffusivity of small molecules in these gels all suggest that the gels have a low incidence of defects.

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See more of this Session: Polymer Networks and Gels
See more of this Group/Topical: Materials Engineering and Sciences Division