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Aggregation, Phase Behavior and the Nature of Networks Formed by some Rod-Like Polymers

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Book cover Microdomains in Polymer Solutions

Part of the book series: Polymer Science and Technology ((NISS,volume 30))

Abstract

The rheological properties of four polymer-solvent systems involving rod-like polymers which formsgels were investigated. The systems studied were rod-like polybenzylglutamate (PBLG) in dimethylformamide (DMF), a solvent in which it does not aggregate, and in toluene, a solvent in which it end-to-end aggregates; polymerized deoxy-hemoglobin S (HbS) in aqueous solution; and bronchial mucus, having as a main component a stiff chain glycoprotein. The storage modulus of PBLG was found to be remarkably independent of concentration, molecular weight, temperature and solvent, and did not correspond to the “brush-pile” (rod polymer entanglements) theory of Doi. Sickle cell hemoglobin gels were found to have rheological properties very similar to PBLG gels. We propose that HbS does not show gel properties due to “brushpile” behavior, but indeed forms a three dimensional network. The rheological properties of the bronchial glycoprotein were found to be quite distinct from PBLG or HbS. A strong concentration dependence of the storage modulus was observed. At concentrations delivered from the lungs bronchial mucus is a non-integral, weak gel. Only upon concentrating do the rheological properties indicate an integral network.

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© 1985 Plenum Press, New York

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Miller, W.G., Chakrabarti, S., Seibel, K.M. (1985). Aggregation, Phase Behavior and the Nature of Networks Formed by some Rod-Like Polymers. In: Dubin, P. (eds) Microdomains in Polymer Solutions. Polymer Science and Technology, vol 30. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-2123-1_9

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  • DOI: https://doi.org/10.1007/978-1-4613-2123-1_9

  • Publisher Name: Springer, Boston, MA

  • Print ISBN: 978-1-4612-9255-5

  • Online ISBN: 978-1-4613-2123-1

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