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Intermolecular association study of segmented polyurethane solutions by fluorescence spectroscopy and rheology

M. LUPU1, V. EPURE1, D. MACOCINSCHI1, S. IOAN1,*

Affiliation

  1. “Petru Poni” Institute of Macomolecular Chemistry, Grigore Ghica Voda Alley 41 A, 700487 Iasi, Romania

Abstract

Poly(ester urethane)s and poly(ether urethane)s containing different soft and hard segments were investigated by fluorescence spectra and rheology. Polarity dependence of the vibrational structure of the pyrene emission spectrum indicated the formation of aggregates at concentrations, significantly below the critical ones, which define the separation of dilute-semidilute domains. The results are discussed in correlation with rheological data, reporting the effects of steady shear flows on intermolecular association are reported. The rheological properties were measured experimentally on a rheometer with a cone plane measuring sistem. This study shows that the growth and strength of association structures are tuned by factors such as: synthesis process, composition of soft and hard segments, and polymer concentration..

Keywords

Segmented polyurethanes, Fluorescence spectroscopy, Rheology.

Submitted at: Nov. 2, 2006
Accepted at: April 15, 2007

Citation

M. LUPU, V. EPURE, D. MACOCINSCHI, S. IOAN, Intermolecular association study of segmented polyurethane solutions by fluorescence spectroscopy and rheology, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 4, pp. 985-989 (2007)