Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5202209 | Polymer Degradation and Stability | 2013 | 7 Pages |
Abstract
We employ silicon-proton (29Si{1H}) cross polarization magic-angle spinning (CP-MAS) to probe directly the interface of a silica-filled polysiloxane elastomer subjected to gamma radiation. Using a traditional spin-lock CP experiment in conjunction with a silicon-edited proton rotating-frame longitudinal relaxation sequence, the full suite of CP build-up parameters are extracted for six resolvable silicon chemical shifts. The data, represented by three parameters, THX, T1ÏH, and Mâ, are interpreted by means of a model where the simultaneous effects of silica surface hydroxyl modification, interfacial water content, and radiation-induced chemistries are considered responsible for the observed macroscopic behavior of these engineering materials.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Organic Chemistry
Authors
Brian P. Mayer, Sarah C. Chinn, Robert S. Maxwell, Jeffrey A. Reimer,