Shear Rate Dependence of Viscosity and First Normal Stress Difference of LCP/PET Blends at Solid and Molten States of LCP
IR@AMPRI: CSIR-Advanced Materials and Processes Research Institute, Bhopal
View Archive Info| Field | Value | |
| Title |
Shear Rate Dependence of Viscosity and First Normal Stress Difference of LCP/PET Blends at Solid and Molten States of LCP
|
|
| Creator |
Dr., Takeshi Kitano
Dr., S A R Hashmi |
|
| Subject |
Polymeric Materials
|
|
| Description |
The liquid crystalline polymer (LCP) and polyethylene terephthalate (PET) were blended in an elastic
melt extruder to make samples having 20, 40, 60, 80, and
100 wt % of LCP. Morphology of these samples was studied
using scanning electron microscopy. The steady state shear
viscosity (Z), dynamic complex viscosity (Z*) and first normal stress difference (N1) were evaluated and compared at two temperatures: 2658C, at which LCP was in solid state, and 2858C, at which LCP was in molten state. The PET was in
molten state at both the temperatures. The shear viscosity of the studied blends displayed its dependence on composition and shear rate. A maxima was observed in viscosity versus composition plot corresponding to 80/20 LCP/PET blend. The N1 increased with LCP loading in PET and with the increased asymmetry of LCP droplets. The N1 also varied with the shear stress in two stages; the first stage demonstrated elastic deformation,
whereas second stage displayed dominant plastic
deformation of LCP droplets.
|
|
| Publisher |
Wiley Online Library
|
|
| Date |
2007
|
|
| Type |
Article
PeerReviewed |
|
| Identifier |
Dr., Takeshi Kitano and Dr., S A R Hashmi (2007) Shear Rate Dependence of Viscosity and First Normal Stress Difference of LCP/PET Blends at Solid and Molten States of LCP. Journal of Applied Polymer Science, 104. pp. 2212-2218. ISSN 0021-8995
|
|
| Relation |
http://ampri.csircentral.net/25/
|
|