caa a22 4500 475764374 CHVBK 20180406123600.0 cr unu---uuuuu 170329e20001001xx s 000 0 eng 10.1007/s003960000345 doi (NATIONALLICENCE)springer-10.1007/s003960000345 Time-resolved near-infrared and two-dimensional near-infrared correlation spectroscopic studies on polymerization of the silane coupling agent perfluorooctyltrimethoxysilane [Elektronische Daten] [T. Ogasawara, A. Nara, H. Okabayashi, E. Nishio, C. J. O'Connor]  The polymerization behavior of perfluorooctyltrimethoxysilane (PFOS) in ethanol, which is acid-catalyzed by 0.25 M HCl, has been examined using time-resolved near-IR and 2D near-IR correlation spectra. In the time-resolved near-IR spectra, the bands at 5164 and 4825 cm−1 have been assigned to the combination bands of water and ethanol OH groups, respectively. It has been found that the absorbance variation of the two near-IR bands occurs in a two-step process. The absorbance of the 5164 cm−1 band rapidly decreases in the initial step but increases exponentially in the second step, while that of the 4825 cm−1 band rapidly increases both in the initial step and, exponentially, in the second step. These results indicate that the time-dependent absorbance variation of the two near-IR bands reflects the polymerization process of PFOS, in which consumption and release of water molecules and release of methanol in the two-step process occur as a consequence of the acid-catalyzed hydrolysis of methoxy groups and the formation of silanols (SiOH) to form a siloxane bond. It has also been found that this polymerization process is distinctly reflected in the 2D near-IR correlation spectra. Springer-Verlag Berlin Heidelberg, 2000 Key words Time-resolved near infrared nationallicence Two-dimensional correlation nationallicence Perfluorooctyltri methoxysilane nationallicence Condensation water, alcohol and silanol behavior nationallicence Ogasawara T. Department of Applied Chemistry Nagoya Institute of Technology Gokiso-cho, Showa-ku Nagoya 466-8555, Japan, JP aut Nara A. Nicolet Japan, Osaka Laboratory Terauchi, Toyonaka Osaka 560-0872, Japan, JP aut Okabayashi H. Department of Applied Chemistry Nagoya Institute of Technology Gokiso-cho, Showa-ku Nagoya 466-8555, Japan, JP aut Nishio E. Nicolet Japan, Osaka Laboratory Terauchi, Toyonaka Osaka 560-0872, Japan, JP aut O'Connor C. J. Department of Chemistry The University of Auckland Private Bag 92019, Auckland New Zealand, NZ aut https://doi.org/10.1007/s003960000345 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s003960000345 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ogasawara T. Department of Applied Chemistry Nagoya Institute of Technology Gokiso-cho, Showa-ku Nagoya 466-8555, Japan, JP aut NATIONALLICENCE 700 1- Nara A. Nicolet Japan, Osaka Laboratory Terauchi, Toyonaka Osaka 560-0872, Japan, JP aut NATIONALLICENCE 700 1- Okabayashi H. Department of Applied Chemistry Nagoya Institute of Technology Gokiso-cho, Showa-ku Nagoya 466-8555, Japan, JP aut NATIONALLICENCE 700 1- Nishio E. Nicolet Japan, Osaka Laboratory Terauchi, Toyonaka Osaka 560-0872, Japan, JP aut NATIONALLICENCE 700 1- O'Connor C. J. Department of Chemistry The University of Auckland Private Bag 92019, Auckland New Zealand, NZ aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence SWISSBIB 475764374 BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer