Characterization of the structure of modified clay by Raman spectroscopy

✍ Scribed by K. A. Prokhorov; E. A. Saguitova; G. Yu. Nikolaeva; D. N. Kozlov; P. P. Pashinin; E. M. Antipov; V. A. Gerasin; F. N. Bakhov; M. A. Guseva

• Publisher: John Wiley and Sons
• Year: 2005
• Tongue: English
• Weight: 229 KB
• Volume: 2
• Category: Article
• ISSN: 1612-2011
• DOI: 10.1002/lapl.200510004

✦ Synopsis

One of promising fillers for polymers, sodium
montmorillonite modified by dioctadecyldimethylammonium bromide
(DODAB), has been studied by Raman spectroscopy, X-ray analysis,
and differential scanning calorimetry (DSC). It has been shown
that an increase in the DODAB content enlarges the height of a
clay interlayer space through filling the clay interlayer
galleries with DODAB molecules. According to both Raman and DSC
data, DODAB molecules grafted to the clay can be in three
different phase states depending on the modifier content. At a low
DODAB content, its molecules are separated and contain a
significant amount of gauche-conformers in methylene
chains. At a medium content, the DODAB molecules form clusters,
and the amount of trans-conformers in the DODAB methylene
chains considerably increases. At a high DODAB content, its
molecules are straightened and form a 2D ordered structure with
either hexagonal or triclinic symmetry.