Conformation of water soluble copolymers of methacrylic acid and benzyl methacrylate
| Autor: | Bernard Martel, Alain Pollet, Laurent Leclercq, M. Morcellet |
|---|---|
| Přispěvatelé: | Université de Montpellier (UM), Institut des Biomolécules Max Mousseron [Pôle Chimie Balard] (IBMM), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM), Laboratoire de Chimie Organique et Macromoleculaire (UMR CNRS 8009), Ecole Nationale Supérieure de Chimie de Lille (ENSCL)-Université de Lille, Sciences et Technologies |
| Rok vydání: | 1999 |
| Předmět: |
Aqueous solution
Polymers and Plastics Organic Chemistry General Physics and Astronomy Acid–base titration 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Sodium perchlorate 01 natural sciences Polyelectrolyte 0104 chemical sciences chemistry.chemical_compound [CHIM.POLY]Chemical Sciences/Polymers Benzyl chloride chemistry Methacrylic acid Polymer chemistry Materials Chemistry [CHIM]Chemical Sciences Pyrene Solubility 0210 nano-technology ComputingMilieux_MISCELLANEOUS |
| Zdroj: | European Polymer Journal European Polymer Journal, Elsevier, 1999, 35 (2), pp.185-193. ⟨10.1016/S0014-3057(98)00124-4⟩ |
| ISSN: | 0014-3057 1873-1945 |
| DOI: | 10.1016/s0014-3057(98)00124-4 |
| Popis: | A series of copolymers of methacrylic acid and benzyl methacrylate (up to 15 mole %) was prepared by reaction of the sodium salt of poly(methacrylic acid) (PMA) and benzyl chloride. The effect of increasing the amount of hydrophobic groups on the hypercoil conformation of PMA was studied by potentiometry, viscosimetry, solubility and fluorescence measurements, using pyrene as a probe. The hypercoil conformation is stabilized by benzyl groups in water but in the presence of sodium perchlorate or urea, the opposite effect is observed due to drastic changes of the entropy change accompanying the conformational transition. Measurements of the intrinsic fluorescence of benzyl groups revealed that it is sensitive to the conformational transition. Using pyrene as a probe indicates that, in acid conditions, the increase of the hydrophobic nature of the polymers makes the hypercoil progressively tighter, and prevents the probe dissolving inside the polymer coil. In these conditions, pyrene is located at the interface between the polymer and solvent in a medium of relatively high polarity. On the contrary, in basic medium, for the extended conformation, increasing the hydrophobicity of the polymer decreases the polarity of the medium surrounding pyrene. |
| Databáze: | OpenAIRE |
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