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T.N. Nguyen, K. Geiger, H.-G. Fritz
Rheological properties and shear induced texture development of thermotopic liquid crystalline polymer melts

Appl. Rheol. 12:3 (2002) 142-150

The flow behavior of two commercial liquid crystalline polymers (LCPs), trade name Vectra B 950 and Vectra L 950 supplied by Ticona, was investigated using a capillary rheometer with a special double slit die. The pressure drops in convergent and divergent wedge passage between the two slit sections, which are influenced by the curvature strains in nematic melts, were determined and compared with the pressure drops of a conventional polystyrene (PS) with flexible polymer chains. Furthermore the extensional viscositiy was determined from the pressure drop in convergent wedge passage. The development of the shear induced texture as a function of shear rate was investigated by use of a rapidly coolable double slit die with the same gap design as the double slit die used for viscosity measurement. The structural analysis was performed using polarized light microscopy.

Cite this publication as follows:
Nguyen TN, Geiger K, Fritz H-G: Rheological properties and shear induced texture development of thermotopic liquid crystalline polymer melts, Appl. Rheol. 12 (2002) 142.

K. Geiger, M. Dressler, M.H. Wagner
Spring meeting of the section polymer physics of the german physical society (DPG)

Appl. Rheol. 9:2 (1999) 80-81

Cite this publication as follows:
Geiger K, Dressler M, Wagner MH: Spring meeting of the section polymer physics of the german physical society (DPG), Appl. Rheol. 9 (1999) 80.

K Geiger
Disclinations in Liquid Crystalline Polymer Melts

Appl. Rheol. 6:4 (1996) 172

Cite this publication as follows:
Geiger K: Disclinations in Liquid Crystalline Polymer Melts, Appl. Rheol. 6 (1996) 172.

K Geiger
Curved Slit Capillary Rheometers

Appl. Rheol. 3:3 (1993) 183

Cite this publication as follows:
Geiger K: Curved Slit Capillary Rheometers, Appl. Rheol. 3 (1993) 183.


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