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The Dynamics of Phase Separation in Rigid-Rod Molecular Composites

Published online by Cambridge University Press:  26 February 2011

Hoe Hin Chuah ,
Thein Kyu  and
T. E. Helminiak
Hoe Hin Chuah
Affiliation:
University of Dayton Research Institute, Dayton, OH 45469
Thein Kyu
Affiliation:
Polymer Engineering Center, University of Akron, Akron, OH 44325
T. E. Helminiak
Affiliation:
Materials Laboratory, Wright-Patterson Air Force Base, OH 45433
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Abstract

The thermally induced phase separation of poly(p-phenylene benzobisthiazole)/ Nylon 66 molecular composites was followed by small-angle light scattering which showed the development of a scattering ring. The intensity increased and the ring moved towards the main beam as a function of time.

The scattering vector qm and intensity maxima Im scaled as qm~t−∝ and Im~tβ with ∝~ 0.33 and β = 0.91-0.95, in close agreement with the cluster dynamics prediction of Binder. However, at longer times, the increase in both qm and Im slowed down dramatically indicating a different mechanism. The structure function S(x) was used to test the validity of universal scaling for a rigid-rod/flexible coil polymer blend. At large x, S(x) scaled to the power of −2.4 in x, which is in between values predicted for systems with one and two-dimensional diffusion.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 134: Symposium J – Materials Science and Engineering of Rigid-Rod Polymers , 1988 , 523
Copyright
Copyright © Materials Research Society 1989

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References

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