Record Details

Studies on poly(vinylidene fluoride)–clay nanocomposites: effect of different clay modifiers

DSpace at IIT Bombay

View Archive Info
 
 
Field Value
 
Title Studies on poly(vinylidene fluoride)–clay nanocomposites: effect of different clay modifiers
 
Creator PATRO, TU
MHALGI, MILIND V
KHAKHAR, DV
MISRA, ASHOK
 
Subject organoclay
pvdf
nanocomposite
 
Description Montmorillonite clay based poly(vinylidene fluoride) nanocomposites were prepared by melt-mixing. The clays used included unmodified clay, a commercially available ammonium based clay, and two organically modified clays prepared by cation exchange with hexadecylpyridinium chloride and with octadecyltriphenylphosphonium bromide. PVDF–clay nanocomposites were processed in a mini twin-screw extruder. The structure of nanocomposites, analyzed using WAXD and TEM, indicated different extents of the clay dispersion depending on the modifier. PVDF formed β-phase crystals in the presence of organically modified clay when crystallized from its melt; in contrast, α-crystals were formed in the absence of clay and with unmodified clay. SAXS analysis indicated that the long period and crystalline lamella thickness decreased with the addition of clay. The melting and crystallization temperatures increased around 10 and 13 °C, respectively, with 5 wt% of phosphonium modified clay, which was the highest among the clays used. Further, the clay served as a nucleating agent for PVDF matrix, as observed by hot-stage polarized optical microscopy. The average spherulitic radius, determined from small angle light scattering, decreased with clay content. The elongation at break increased around 200% with the addition of only 5 wt% of ammonium clay. The storage and loss moduli of the nanocomposites were significantly higher than those of PVDF throughout the temperature range. Dielectric measurements showed a maximum increase of about 8 units of dielectric constant at 1 Hz frequency with 5 wt% organoclay.
 
Publisher Elsevier
 
Date 2009-03-05T08:22:57Z
2011-11-25T18:32:39Z
2011-12-26T13:07:05Z
2011-12-27T05:55:07Z
2009-03-05T08:22:57Z
2011-11-25T18:32:39Z
2011-12-26T13:07:05Z
2011-12-27T05:55:07Z
2008
 
Type Article
 
Identifier Polymer 49(16), 3486-3499
0032-3861
http://dx.doi.org/10.1016/j.polymer.2008.05.034
http://hdl.handle.net/10054/868
http://dspace.library.iitb.ac.in/xmlui/handle/10054/868
 
Language en