Abstract
Visible absorption, infrared absorption, Raman, and kinetic measurements are all strongly suggestive of a single-chain origin for the conformational transitions observed for polydiacetylenes in the solution phase, poly4BCMU and poly3BCMU being the prototypical examples. Intramolecular association between substituent groups on the polydiacetylene backbone has been assigned as the driving force for the transition; in the case of the BCMU polymers, hydrogen bonding provides the association mechanism. In this paper we review recent work on polydiacetylene solutions with emphasis on rheological and time-temperature dependent quasielastic light scattering measurements for poly4BCMU in the dilute-semidilute regime. Light scattering measurements during the coil-to-rod transformation (yellow-to-red color change) demonstrate that dramatic color changes take place without any measurable change in hydrodynamic radius, confirming the single-chain origin of the conformational change. On aging, aggregation is observed as an order-of-magnitude increase in hydrodynamic radius.
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© 1988 Plenum Press, New York
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Peiffer, D.G. et al. (1988). Conformational Transitions in Polydiacetylene Solutions. In: Prasad, P.N., Ulrich, D.R. (eds) Nonlinear Optical and Electroactive Polymers. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-0953-6_11
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DOI: https://doi.org/10.1007/978-1-4613-0953-6_11
Publisher Name: Springer, Boston, MA
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