| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 5204614 | Polymer Degradation and Stability | 2007 | 11 Pages |
Abstract
The combination of experimental techniques allowed for a comprehensive study of aging processes occurring in RTV siloxane foams. 119Sn Mössbauer spectroscopy demonstrated that tin residues are composed of Sn(II) and Sn(IV) species. The 27-year-old foams showed only Sn(IV) species with a quadrupole-splitting parameter larger than that observed for SnO2. Solid-state 29Si NMR differentiated between the various functional linkages in the foams, and showed no significant change of the di- to trifunctional linkage ratios. High-resolution NMR, on solvent extract of foams, showed the presence of water, catalyst, plasticizer, and some silicone oligomers. ATR-FTIR demonstrated changes near the surface of the foam when aged with water and with the presence of the tin catalyst. Gamma irradiation at a low dose had little effect on compression sets. The main changes observed for artificially aged and aged in service foams were related to the presence of the tin catalyst.
Related Topics
Physical Sciences and Engineering
Chemistry
Organic Chemistry
Authors
Andrea Labouriau, Jonathan D. Cox, Jon R. Schoonover, Brian M. Patterson, George J. Havrilla, Thomas Stephens, Dean Taylor,