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Fourth Symposium on the Science and Technology of Building Seals, Sealants, Glazing and Waterproofing, ASTM STP 1243: 02 February 1994, Fort Lauderdale, FL., U.S.A.

Series: ACS Symposium Series

Fourier transform infrared photoacoustic (PASFTIR) spectroscopy and thermogravimetry (TG) havebeen used to study the effects of exposure of silicone sealants to water in the presence and absence ofUV-radiation. The silicone sealants were found to be fairly resistant to the two types of weathering conditions for the duration of the exposure (8000 hours). Only a small increase in the hydroxyl absorption band was observed by PAS-FTIR. No substantial changes in weight loss were observed using thermogravimetry.

Fall Meeting : Proceedings of the American Chemical Society, Division of Polymeric Materials : Science and Engineering: 1994-08, Washington, DC, USA

The order-disorder behaviour of l~chloroadamantane (l~C 10H 15C1) has been investigated by differential scanning calorimetry, and variable-temperature vibrational and 13C NMR spectroscopy. The factor group splittings in the vibrational spectra are in accord with the known crystal structures of the two phases. The 13C spin-lattice relaxation times and dipolar dephasing measurements have been analysed to give the barriers to rotation in both phases and to determine the nature of the rotations in each phase. In the ordered phase, the motion is limited to rotation about the molecular axis. In the disordered phase, additional motions occur about axes through the tertiary carbon atoms.

Proceedings of the American Chemical Society, Division of Polymeric Materials : Science and Engineering ( Denver, CO., USA, 1993), Spring Meeting 1993 : Proceedings of the American Chemical Society, Division of Polymeric Materials : Science and Engineering: 28 March 1993, Denver, CO, USA

39th Canadian Spectroscopy Conference: 1993, Quebec, Que., Canada

Proceedings of the American Chemical Society, Division of Polymeric Materials : Science and Engineering ( Chicago, Il, USA), American Chemical Society, Division of Polymeric Materials: Science and Engineering, August 22, 1993, Chicago, IL, USA