Micellization Process in Poly(Ether Urethane) Solutions

Abstract

Poly(ether urethane)s containing different hard segments were investigated by viscometry, fluorescence spectra, polarizing optical microscopy, and scanning electron microscopy. The polarity dependence of the vibrational structure of the pyrene emission spectrum indicated the formation of aggregates at concentrations that are significantly below the critical concentrations that define the separation of dilute‐semidilute domains. Unlike the sample with 4,4'‐methylene diphenylene diisocyanate, the sample with 2,4‐tolylene diisocyanate in hard segments gives a fluorescence spectra in which the pyrene excimer appears. Supermolecular structures associated with the form of spherulites or of spherical micelles were detected by scanning electron microscopy. The results are discussed in correlation with viscometric data and optical microscopy.

Keywords:

• poly(ether urethane)s
• micellization process