pps proceeding
Symposium: S01 - Mixing and Compounding Poster Presentation
Analysis of dynamic oscillatory rheological properties of PP/EVA/organo-modified LDH ternary hybrids based on generalized Newtonian fluid and generalized linear viscoelastic approaches
khonakdar sangdehi hossein ali (1)*
(1) Leibniz Institute of Polymer Research, 01067 Dresden, Germany - Tehran - Iran
Abstract A comprehensive investigation was performed on single-step melt processed
polypropylene (PP)/(ethylene vinyl acetate copolymer (EVA)/organo-modified
layered double hydroxide (LDH) counterpart ternary hybrids to explore the
effect of LDH loading on small-amplitude oscillatory shear (SAOS) rheological
properties and to correlate the properties with microstructure. The rheological
results were analyzed in detail from qualitative and quantitative perspectives. Using
qualitative interoperation of storage modulus and complex viscosity alteration
against LDH loading, and also quantitative analysis by viscosity models based on
both the generalized Newtonian fluid (GNF) and generalized linear viscoelastic
(GLVE) approaches, detailed predictions were carried out on the microstructure of
samples and also partitioning of the organo-modified LDH particles and their
intercalation and exfoliation extent within hybrids. By comparing the elasticity and
relaxation spectrum of PP-rich/LDH with those of EVA-rich/LDH hybrids, it was
predicted that organo-modified LDH platelets, in the case of PP-rich samples, have
been located at the interface or within the EVA dispersed particles, while in the case
of EVA-rich samples, they mainly localized within the matrix. In addition, the
crossover frequency and slope of G0 and G00 curve at terminal region were correlated
with the extent of intercalated and exfoliated structures of filler. The validity of
these predictions on microstructure of the developed hybrids was confirmed visually
using transmission electron microscope (TEM) micrographs.