Blends of Vectra A900, a thermotropic liquid crystalline polymer (LCP), and poly(ethylene terephthalate) (PET) were studied over the entire composition range using scanning electron microscopy, differential scanning calorimetry, and rotational rheometry. There is some interaction between the polymers, as evidenced by melting‐ and crystallization‐point depression in the PET phase. The shear rheology deviates substantially from simple mixing laws and from predictions of an emulsion model of dispersed blends. The viscosity of LCP‐rich compositions exceeds that of either component at low rates and frequencies. The viscosity of PET‐rich compositions falls below that of either component at low rates and frequencies. The latter observation cannot be explained by deformation and orientation of the LCP phase, since the dispersed LCP inclusions remain spherical following steady shear.
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November 1992
Research Article|
November 01 1992
Properties of blends of a thermotropic liquid crystalline polymer with a flexible polymer (Vectra/PET)
Woo Nyon Kim;
Woo Nyon Kim
Department of Chemical Engineering, University of California at Berkeley
Center for Advanced Materials, Lawrence Berkeley Laboratory, Berkeley, California 94720
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Morton M. Denn
Morton M. Denn
Department of Chemical Engineering, University of California at Berkeley
Center for Advanced Materials, Lawrence Berkeley Laboratory, Berkeley, California 94720
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J. Rheol. 36, 1477–1498 (1992)
Article history
Received:
November 04 1991
Accepted:
July 23 1992
Citation
Woo Nyon Kim, Morton M. Denn; Properties of blends of a thermotropic liquid crystalline polymer with a flexible polymer (Vectra/PET). J. Rheol. 1 November 1992; 36 (8): 1477–1498. https://doi.org/10.1122/1.550269
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