Coil Size and Long Range Excimers. 2. Good Solvent/Nonsolvent Mixtures

Autor:	Ines F. Pierola, M. Reyes Vigil, Carmen S. Renamayor
Rok vydání:	1995
Předmět:	chemistry.chemical_classification Ternary numeral system Chromatography Polymers and Plastics Organic Chemistry Fluorescence spectrometry Analytical chemistry Polymer Excimer Inorganic Chemistry Solvent chemistry.chemical_compound Viscosity Monomer chemistry Materials Chemistry Solvent effects
Zdroj:	Macromolecules. 28:5745-5750
ISSN:	1520-5835 0024-9297
DOI:	10.1021/ma00121a008
Popis:	This paper presents results of steady state fluorescence spectra measurements on polyindene (PIN) and polyacenaphthylene (PAN) samples of different molecular weights, in dilute solution at constant temperature, 25 °C. Solvents were prepared by mixing a solvent and a precipitant in different proportions. Large changes in the size of the particles in solution (determined by turbidimetric methods) caused by incipient phase separation were necessary to produce significant changes of the excimer to monomer fluorescence ratio for both PIN and PAN. A linear relationship between the excimer to monomer fluorescence ratio and the volume of the polymer aggregates is found. Such a relationship is solvent viscosity independent. Several conclusions are drawn about the phase separation process in very dilute polymer solutions.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::3ea43c7ea3ec04939a0192b128c60b4f https://doi.org/10.1021/ma00121a008 Zobrazit plný text záznamu