| Autor: |
Ye.V. Anufrieva, M.G. Krakovyak, S.S. Skorokhodov |
| Rok vydání: |
1969 |
| Předmět: |
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| Zdroj: |
Polymer Science U.S.S.R.. 11:2842-2847 |
| ISSN: |
0032-3950 |
| DOI: |
10.1016/0032-3950(69)90425-0 |
| Popis: |
POLYMERS tO which chromophore groups have been covalently added are most frequently used for studying certain properties of natural and synthetic macromolecules and the mechanism of their formation [1-4]. The relaxation behaviour of polymers with luminescent groups may be studied by the polarized luminescence method. The latter is repeatedly used with success in studying rapid relaxation processes when the periods of relaxation and luminescence are comparable; moreover it enables us to study the intramolecular motion of macromolecules in solution and in the mass. The advantages of the method include the possibility of experiments in water and other polar solvents; this along with the high sensitivity of the method facilitates work with low concentrations of the polymer in solution. The polarized luminescence method [1, 4] involves the use of luminescent markers covalently added to the macromolecules and possessing certain optical properties. The number of these specially added groups must be sufficient for purposes of spectral analysis and small enough to prevent distortion of the properties of the macromolecules. Several methods of preparing macromolecules with chemically added luminescent groups have been described [2, 5], but these are mainly applicable to polymers that have NH bonds. Our aim was to develop a convenient and general method of adding luminescent groups to polymers containing carboxyl groups. In a previous study [4] we prepared polyacrylic and polymethacrylic acids with covalently added luminescent groups. However the method used for their preparation involves polymer analogue conversions of the corresponding polyacryloyl chlorides, and this limits its usefulness. The chemical addition of luminescent groups to polymers containing carboxyl groups may be realized through specially selected aliphatic diazo compounds (diazoalkanes) interacting with COOH groups of the polymer. The reaction of diazoalkanes with earboxylic acids proceeds by the scheme [6] |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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