Spectroscopic characterization of low molecular weight fluids from silicone elastomers

Hunt, Susan, Cash, Greg, Liu, Heping, George, Graeme and Birtwhistle, David (2002) Spectroscopic characterization of low molecular weight fluids from silicone elastomers. Journal of Macromolecular Science: Part A - Pure and Applied Chemistry, A39 9: 1007-1024. doi:10.1081/MA-120013576

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Author Hunt, Susan
Cash, Greg
Liu, Heping
George, Graeme
Birtwhistle, David
Title Spectroscopic characterization of low molecular weight fluids from silicone elastomers
Journal name Journal of Macromolecular Science: Part A - Pure and Applied Chemistry   Check publisher's open access policy
ISSN 1060-1325
1520-5738
Publication date 2002-09-01
Sub-type Article (original research)
DOI 10.1081/MA-120013576
Volume A39
Issue 9
Start page 1007
End page 1024
Total pages 18
Place of publication New York
Publisher Taylor and Francis Ltd
Language eng
Subject 091209 Polymers and Plastics
Abstract The migration of low molecular weight (LMW) silicone fluid from the bulk to the surface of polydimethylsiloxane (PDMS) elastomers results in hydrophobic recovery after thermal or UV damage. The identification and analysis of these silicone fluids is an important step in understanding the process which ultimately affects the service lifetime of the elastomer and may provide one approach to assessing residual service lifetime in applications such as high voltage insulation. LMW silicone fluids were extracted from the bulk of four different silicone elastomers used as the weather sheds on high voltage insulators and differences were observed both in the total amount of fluid and the amounts obtained on successive extractions. MALDI-MS analysis of the extracted fluids showed significant differences in the proportions of cyclic and linear species. The extracted fluids were also analyzed by FTIR and Raman spectroscopy to determine trimethyl silyl end-group concentration using a calibrated series of PDMS standards containing known proportions of linear and cyclic species. Comparison of FTIR and Raman analysis with the MALDI-MS showed a major limitation in vibrational spectroscopic analysis of cyclic/linear content occurred when the linear species terminated in dimethylhydroxyl rather than trimethyl silyl groups.
Keyword Polydimethylsiloxane
Low molecular weight silicones
Matrix-assisted laser mass spectrometry
MALDI
FTIR
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

 
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Created: Sat, 29 Apr 2006, 00:05:56 EST