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Evidence of ionic aggregates in some ampholytic polymers by transmission electron microscopy

Published online by Cambridge University Press:  31 January 2011

V. M. Castaño ,
A. E. González ,
J. Cardoso ,
O. Manero  and
V. M. Monroy
V. M. Castaño
Affiliation:
Instituto de Física, Universidad Nacional Autónoma de México, Apdo. Postal 20-364, 01000 México, D. F.
A. E. González
Affiliation:
Instituto de Física, Universidad Nacional Autónoma de México, Apdo. Postal 20-364, 01000 México, D. F.
J. Cardoso
Affiliation:
Instituto de Investigacions en Materiales, Universidad Nacional Autónoma de México, Apdo. Postal 70-360, 04510 México, D. F.
O. Manero
Affiliation:
Instituto de Investigacions en Materiales, Universidad Nacional Autónoma de México, Apdo. Postal 70-360, 04510 México, D. F.
V. M. Monroy
Affiliation:
Instituto de Investigacions en Materiales, Universidad Nacional Autónoma de México, Apdo. Postal 70-360, 04510 México, D. F.
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Abstract

Transmission electron microscopy observations were conducted on some zwitterionic polymers. Our observations were concentrated on the morphology of the solid state of poly (4-vinyl pyridine-sulfopropyl bctaines), with different degrees of quaternization. Among the morphological features, a microstructure arising from aggregated regions in the range of 50 to 200 Å is observed. Quite striking is the fact that this structure is absent in the micrographs for the base polymer, indicating that the aggregates are due to the interactions of the ion pairs of the polyzwitterions, as in the ionomer case. It is also found that the density of the aggregates increases when we increase the zwitterionic content of the copolymers.

Type
Articles
Information
Journal of Materials Research , Volume 5 , Issue 3 , March 1990 , pp. 654 - 657
Copyright
Copyright © Materials Research Society 1990

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References

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