caa a22 4500 475764420 CHVBK 20180406123600.0 cr unu---uuuuu 170329e20000401xx s 000 0 eng 10.1007/s003960050517 doi (NATIONALLICENCE)springer-10.1007/s003960050517 Growth process for fractal polymer aggregates formed by perfluorooctyltrimethoxysilane. Time-resolved small-angle X-ray scattering study [Elektronische Daten] [T. Ogasawara, K. Izawa, N. Hattori, H. Okabayashi, C. J. O'Connor] The acid-catalyzed condensation reaction of perfluorooctyltrimethoxysilane (PFOS) and n-octyltrimethoxysilane (OTMS) in ethanol has been followed by time-resolved synchrotron radiation small-angle X-ray scattering (SAXS) on a short time scale. SAXS curves for PFOS and OTMS have been interpreted as arising from mass fractals with D f=2 (PFOS) and D f=1.7 (OTMS). The time dependence of the apparent radius of gyration, obtained from the Guinier plots, showed that the growth of fractal precursors occurs in a two-step process within 2 h for PFOS and within 1.5 h for OTMS, in which small clusters involving monomers, dimers and trimers are formed in the initial step and formation of larger clusters occurs in the second step. Furthermore, it has been suggested that the hydrophobicity and lipophobicity of the bulky alkyl groups may also contribute to the formation of these giant aggregates. Springer-Verlag Berlin Heidelberg, 2000 Key words Perfluorooctyl-trimethoxysilane nationallicence Mass fractal nationallicence Small-angle X-ray scattering nationallicence Ogasawara T. Department of Applied Chemistry Nagoya Institute of Technology Gokiso-cho, Showa-ku, Nagoya 466-855 Japan, JP aut Izawa K. Department of Applied Chemistry Nagoya Institute of Technology Gokiso-cho, Showa-ku, Nagoya 466-855 Japan, JP aut Hattori N. Department of Applied Chemistry Nagoya Institute of Technology Gokiso-cho, Showa-ku, Nagoya 466-855 Japan, JP aut Okabayashi H. Department of Applied Chemistry Nagoya Institute of Technology Gokiso-cho, Showa-ku, Nagoya 466-855 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/s003960050517 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s003960050517 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ogasawara T. Department of Applied Chemistry Nagoya Institute of Technology Gokiso-cho, Showa-ku, Nagoya 466-855 Japan, JP aut NATIONALLICENCE 700 1- Izawa K. Department of Applied Chemistry Nagoya Institute of Technology Gokiso-cho, Showa-ku, Nagoya 466-855 Japan, JP aut NATIONALLICENCE 700 1- Hattori N. Department of Applied Chemistry Nagoya Institute of Technology Gokiso-cho, Showa-ku, Nagoya 466-855 Japan, JP aut NATIONALLICENCE 700 1- Okabayashi H. Department of Applied Chemistry Nagoya Institute of Technology Gokiso-cho, Showa-ku, Nagoya 466-855 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 BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer