Accession Number:

ADA222317

Title:

Fluorescent Probe Investigation of a Water-Soluble Polyphosphazene

Descriptive Note:

Technical rept. no. 6, 1 Jun 1989-31 May 1990,

Corporate Author:

UNIVERSITY OF SOUTHERN MISSISSIPPI HATTIESBURG DEPT OF POLYMER SCIENCE

Report Date:

1990-05-31

Pagination or Media Count:

22.0

Abstract:

The fluorescent probes were utilized to investigate the microenvironment created by a water-soluble polyphosphazene copolymer in aqueous solution. The combination of intensity, wavelength shift, and vibrational analysis measurements of the three small molecule probes is used to postulate an environment at high pH with no added electrolyte which is similar in polarity to methanol. In the absence of excess small molecule electrolyte, negatively charged probes are repelled by the charge on the polymer. Addition of small molecule electrolyte results in solubilization of the negatively charged probes. However, pyrene, even in the absence of added electrolyte NaCl is solubilized. Investigation of pyrene fluorescence quenching demonstrates the ability of the polyphosphazene copolymer to bind positively charged ions TI and repel negatively charged ions I-. Neutral quenchers such as nitromethane readily penetrate the microenvironment of the polymer. jes

Subject Categories:

  • Organic Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE