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Mesophase-Enhanced Polymerization and Chemo-Rheology of Poly(p-Phenylenebenzobisthiazole)

Published online by Cambridge University Press:  26 February 2011

Andrea W. Chow
Affiliation:
SRI International, 333 Ravenswood Avenue, Menlo Park, CA 94025
Richard D. Hamlin
Affiliation:
SRI International, 333 Ravenswood Avenue, Menlo Park, CA 94025
Janet F. Sandell
Affiliation:
SRI International, 333 Ravenswood Avenue, Menlo Park, CA 94025
James F. Wolfe
Affiliation:
SRI International, 333 Ravenswood Avenue, Menlo Park, CA 94025
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Abstract

The phenomenon of mesophase-enhanced polymerization of the rodlike polymer poly(pphenylenebenzobisthiazole) in polyphosphoric acid was investigated. When the polymer concentration was greater than 5 wt%, the reacting mixture became anisotropic at an early stage of the polymerization. The reaction rate increased significantly at the isotropic-nematic phase transition as the rods were aligned in positions more favorable for the condensation reaction to occur. At 4.5 wt% of polymer, the reacting mixture remained isotropic for up to 1500 min of reaction time. The chemo-rheological properties of the 15 wt% reaction mixture indicate the occurrence of the phase change in either the shear viscosity or the first normal stress difference measurements.

Type
Research Article
Copyright
Copyright © Materials Research Society 1989

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References

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Mesophase-Enhanced Polymerization and Chemo-Rheology of Poly(p-Phenylenebenzobisthiazole)
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