Raman spectroscopy of polymer latexes

The influence of elastic light scattering on the Raman signal of polymer latexes was investigated by varying the sample position relative to the confocal Raman probe. Measurements on polystyrene latexes revealed that the absolute Raman signal is very sensitive to the alignment of the sample. Furthermore, it was shown that for particle sizes below 140 nm and solid weight contents below 20%, changes in the absolute Raman signal can be described fairly well by turbidity laws. For larger particle sizes and higher solid weight contents deviations occur, but a correlation between these variables and the Raman signal still exists. In contrast, the normalized intensities are not influenced by varying the sample alignment in measurements on polymer latexes when using an excitation laser source at 532 nm. The important consequence of this is that the determination of chemical composition is not influenced by the elastic light scattering effects. Copyright © 2002 John Wiley & Sons, Ltd.

[1]  A. L. German,et al.  ON-LINE MONITORING AND COMPOSITION CONTROL OF THE EMULSION COPOLYMERIZATION OF VeoVA 9 AND BUTYL ACRYLATE BY RAMAN SPECTROSCOPY , 2001 .

[2]  Wolf-Dieter Hergeth,et al.  Raman Scattering on Polymeric Dispersions , 1998 .

[3]  D. Bassett,et al.  Overview of Uses of Polymer Latexes , 1997 .

[4]  E. G. Chatzi,et al.  Recent Developments in Hardware Sensors For the On-Line Monitoring of Polymerization Reactions , 1999 .

[5]  H. A. Willis,et al.  Laboratory methods in vibrational spectroscopy , 1987 .

[6]  B. Chu,et al.  Characterization of poly(methyl methacrylate) during the thermal polymerization of methyl methacrylate , 1984 .

[7]  Bruno Amram,et al.  Latex emulsion polymerisation and composition studies by Fourier transform Raman and infrared spectroscopies , 1994, Other Conferences.

[8]  Müller,et al.  Scaling of transient hydrodynamic interactions in concentrated suspensions. , 1992, Physical review letters.

[9]  W.-D. Hergeth,et al.  On-Line Characterization Methods , 1997 .

[10]  D. Weitz,et al.  Diffusing wave spectroscopy. , 1988, Physical review letters.

[11]  Stefan Keller,et al.  Monitoring of the polymerization of vinylacetate by near IR FT Raman spectroscopy , 1997 .

[12]  D. Weitz,et al.  Nondiffusive Brownian motion studied by diffusing-wave spectroscopy. , 1989, Physical review letters.

[13]  T. Vickers,et al.  Use of Water as an Internal Standard in the Direct Monitoring of Emulsion Polymerization by Fiber-Optic Raman Spectroscopy , 1993 .

[14]  K. Birdi,et al.  Handbook of Surface and Colloid Chemistry , 2002 .

[15]  W. Kiefer,et al.  Investigations of Radical Polymerization and Copolymerization Reactions in Optically Levitated Microdroplets by Simultaneous Raman Spectroscopy, Mie Scattering, and Radiation Pressure Measurements , 1998 .

[16]  P. C. Hiemenz,et al.  Principles of colloid and surface chemistry , 1977 .

[17]  G. Fini,et al.  Solvent effects on Raman band intensities , 1968 .

[18]  Xu,et al.  Shape coexistence and electric monopole transitions in 184Pt. , 1992, Physical review letters.

[19]  J. Schlenoff,et al.  In situ Monitoring of Emulsion Polymerization using Fiber-Optic Raman Spectroscopy , 1992 .

[20]  J. Asua.  Polymeric dispersions : principles and applications , 1997 .