Preparation and properties of self-reinforced polypropylene/liquid crystalline polymer blends

The mechanical properties of self-reinforced liquid crystalline polymer/polypropylene (LCP/PP) blends strongly depend on the viscosity ratio of the blend components in the melt. This ratio was determined for PP blends with different commercial LCPs (Vectra A950 and Vectra B950), by means of capillar...

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Bibliographic Details
Published in:Polymer (Guilford) 1997, Vol.38 (22), p.5557-5564
Main Authors: Postema, A.R., Fennis, P.J.
Format: Article
Language:English
Subjects:
Applied sciences
blends
Exact sciences and technology
liquid crystalline polymer
Mechanical properties
Organic polymers
Physicochemistry of polymers
polypropylene
Properties and characterization
self-reinforced
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Summary:The mechanical properties of self-reinforced liquid crystalline polymer/polypropylene (LCP/PP) blends strongly depend on the viscosity ratio of the blend components in the melt. This ratio was determined for PP blends with different commercial LCPs (Vectra A950 and Vectra B950), by means of capillary rheometry, under conditions representative for the blending process during extrusion. It was found that optimal mechanical properties were achieved when the LCP/PP viscosity ratio at 285°C ranges between 2 and 4 at a shear rate of 800–1000s −1. The LCP/PP viscosity ratio appears to be shear stress dependent. This creates the option of fine tuning the LCP droplet deformation process by means of the extrusion rate. This shear stress dependence is more pronounced for PP blends with Vectra B950 than for blends with Vectra A950.
ISSN:0032-3861
1873-2291
DOI:10.1016/S0032-3861(97)00099-2