• Fluorescence Anisotropy of Fluorescent Whitening Agent Sorbed on Regenerated Cellulose Fibers

EDUARDO IAMAZAKI; PEDRO F. ARAMENDÍA; TERESA DIB ZAMBON ATVARS

Göteborg, Suecia

Simposio; XXth IUPAC Symposium on Photochemistry; 2008

IUPAC

.O {font-size:149%;} <!--.sld {left:0px !important; width:6.0in !important; height:7.99in !important; font-size:138% !important;} --> Polymer chains are often oriented in the process of the polymer into some industrial products whether a manufacturer intends it or not. Physical properties of the products can change sensitively according to the state of the orientation furnished. Therefore, it is important to clarify and comprehend the relationship between the molecular orientation and the physical properties such as mechanical and optical ones. There are several spectroscopic methodologies to study intermolecular interactions. Among them, the steady state photoluminescence anisotropy provides information on molecular conformation and reorientation during the lifetime of the excited sate. Assuming that the styril-biphenyl groups can be rotate freely in some media and that they have constrained rotation in others, we should expect that the fluorescence anisotropy would be able to discriminate these two behaviors if the depolarization will be faster than the decay.