Study on the Difference in Aggregation Behavior Between Bulk Phase and Air-Water Interface for Hydrolysis-Condensation Process of MAPTMS

doi:10.7517/j.issn.1674-0475.2008.05.365

Abstract

Abstract: The aggregation behaviors occurred in bulk phase and at air-water interface for hydrolysis-condensation processe of 3-methacryloxypropyltrimethoxysilane(MAPTMS) were comparatively investigated.The fluorescence spectra of pyrene as probe introduced in the bulk phase and air-water interface implied that there were aggregations of hydrolyzates in bulk phase and at air-water interface.Additionally,the variations in fluorescence spectra with time manifested that both hydrolysis and condensation occurred in bulk phase were faster than that at air-water interface.These conclusions were coincident with the results derived from In-situ ATR-FT-IR and π-A isotherm measurement.The changes in the emission intensity of pyrene were also observed for both cases of bulk phase and air-water interface,indicating that the size of aggregates was changable.All findings related to the aggregation could be interpreted in terms of the hydrolyzed MAPTMS being similar to amphiphilic molecule,and difference in the fluorescence spectra and IR spectra for the bulk phase and air-water interface could be attributed to the difference in the degree of molecular confinement in two cases.It is the difference in the degree of molecular confinement that makes the hydrolysis and condensation of MAPTMS different in two cases.

Key words: 3-methacryloxypropyltrimethoxysilane, hydrolysis and condensation, fluorescent probe, π-A isotherm, aggregation, bulk phase, air-water interface

CLC Number:

ZUO Dong-mei, SHEN Shu-kun, HU Dao-dao. Study on the Difference in Aggregation Behavior Between Bulk Phase and Air-Water Interface for Hydrolysis-Condensation Process of MAPTMS[J]. Imaging Science and Photochemistry, 2008, 26(5): 365-376.

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