Dresden 2006 – wissenschaftliches Programm
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CPP: Chemische Physik und Polymerphysik
CPP 11: POSTER Disperse Polymer Systems
CPP 11.1: Poster
Dienstag, 28. März 2006, 17:00–19:00, P3
Raman characterization of polypropylene-clay nanocomposites — •Goulnara Nikolaeva1, Kirill Prokhorov1, Pavel Pashinin1, Viktor Gerasin2, and Evgeni Antipov2 — 1A.M. Prokhorov General Physics Institute, Russian Academy of Sciences, 38 Vavilov St., 119991 Moscow, Russia — 2A.V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, 29 Leninsky Pr., 119991 Moscow, Russia
We studied nanocomposites made of isotactic polypropylene (PP) and natural montmorillonite modified with a quaternary ammonium salt. The mass content of the clay in the composites varied from 1.5 to 20 percents. The production technology was melt-blending at 200oC and subsequent quenching in water. X-ray analysis of the composites revealed intercalation of polymer macromolecules in the clay interlayer space. The modulus of elasticity of the composites was higher than that of the neat PP and reached its maximum value at 1.5 percents of the clay content.
Raman spectra of the composites were measured with laser excitation at 472.7 nm. At this excitation wavelength, we observed a strong band of luminescence, the intensity of which increased with the increase in the clay content. However, the 2600-3100 cm-1 frequency range of the Raman spectra contained intense lines that can be used for detailed characterization of the composite structure. In particular, when studying the behavior of the intensity of the A-symmetry line at 2963 cm-1, we concluded that the orientation ability of the macromolecules during uniaxial drawing of the samples decreases with the increase of the clay content.