TY - JOUR
T1 - Evolution of morphological and rheological properties along the extruder length for blends of a commercial liquid crystalline polymer and polypropylene
AU - Filipe, S.
AU - Cidade, M. T.
AU - Wilhelm, M.
AU - Maia, João M.
N1 - An acknowledgment is also due to the Marie-Curie Training Site HPMT-CT-2000-00015 at the MPI-P, for the financial support during the stay of S. Filipe at the Max-Planck-Institut für Polymerforschung in Mainz (Germany) and to the financial support provided by Science and Technology Foundation (Portugal) under the project POCTI/CTM/32658/99.
PY - 2004/3
Y1 - 2004/3
N2 - The main aim of this work is to study the morphological and rheological evolution during extrusion of blends of polypropylene and a commercial liquid crystalline polymer, Rodrun LC3000. This study was performed for blends with 10, 20 and 40wt% LCP, processed at 220 and 240°C. For this purpose, a special collecting device was used that allows the removal of samples at different locations along the extruder length. The results of the morphological study revealed that the mean diameter of the LCP structures decrease as they proceed along the extruder axis. The rheological properties were also studied ex situ both in the linear and in the non-linear regime. From the results obtained in oscillatory shear it was observed that the elastic modulus and the complex viscosity decreases from the beginning to the end of the extrusion process, reaching a minimum for the final extrudate. FT rheology was used to study the non-linear viscoelastic behavior and the results also show marked difference between samples collected at various stages of the process, the ratio I(3ω1)/I(ω1) decreasing along the extruder.
AB - The main aim of this work is to study the morphological and rheological evolution during extrusion of blends of polypropylene and a commercial liquid crystalline polymer, Rodrun LC3000. This study was performed for blends with 10, 20 and 40wt% LCP, processed at 220 and 240°C. For this purpose, a special collecting device was used that allows the removal of samples at different locations along the extruder length. The results of the morphological study revealed that the mean diameter of the LCP structures decrease as they proceed along the extruder axis. The rheological properties were also studied ex situ both in the linear and in the non-linear regime. From the results obtained in oscillatory shear it was observed that the elastic modulus and the complex viscosity decreases from the beginning to the end of the extrusion process, reaching a minimum for the final extrudate. FT rheology was used to study the non-linear viscoelastic behavior and the results also show marked difference between samples collected at various stages of the process, the ratio I(3ω1)/I(ω1) decreasing along the extruder.
KW - Fourier transform rheology
KW - Liquid crystalline polymer and thermoplastic blends
KW - Morphological and rheological evolution
UR - http://www.scopus.com/inward/record.url?scp=1442323989&partnerID=8YFLogxK
U2 - 10.1016/j.polymer.2003.12.080
DO - 10.1016/j.polymer.2003.12.080
M3 - Article
AN - SCOPUS:1442323989
VL - 45
SP - 2367
EP - 2380
JO - Polymer
JF - Polymer
SN - 0032-3861
IS - 7
ER -