Aggregation of lead phthalocyanine in blends with polycarbonate
| Autor: | James S. Shirk, Aditya Ranade, Eric Baer, Anne Hiltner, Richard S. Lepkowicz |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
Chloroform
Polymers and Plastics Absorption spectroscopy Dimer Analytical chemistry Concentration effect General Chemistry Molar absorptivity Surfaces Coatings and Films chemistry.chemical_compound Monomer chemistry visual_art Materials Chemistry visual_art.visual_art_medium Organic chemistry Polycarbonate Equilibrium constant |
| Zdroj: | Journal of Applied Polymer Science. 104:464-469 |
| ISSN: | 1097-4628 0021-8995 |
| Popis: | The blends of a nonlinear optical dye with polycarbonate are described and comparisons are made with solutions of the dye in chloroform. Absorption spectra of blends with up to 1 wt % lead tetracumylphenoxy phtha- locyanine showed the dye to be primarily in the monomer form. The monomer absorption spectrum and the measured extinction coefficient replicated those in chloroform solu- tion. As the dye concentration increased to 20 wt %, the monomer intensity decreased and new spectral features characteristic of the dimer appeared. The spectra were resolved into contributions of monomer and dimer, and the concentration effect was analyzed according to the mono- mer/dimer equilibrium. Much higher monomer concentra- tions were achieved in polycarbonate blends compared to chloroform solutions. It was concluded that when the blends were quenched from the melt, the equilibrium established at the melt temperature was preserved in the solid state glass. Quenching the blend from different melt temperatures confirmed this interpretation. Extrapolation of the tempera- ture dependent equilibrium constant to 258C yielded a value close to that reported for chloroform solution at 258C. 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104: 464-469, 2007 |
| Databáze: | OpenAIRE |
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