Association Behavior, Diffusion, and Viscosity of End-Functionalized Supramolecular Poly(ethylene glycol) in the Melt State
| Autor: | Wim Pyckhout-Hintzen, Ana R. Brás, Dieter Richter, Claas Hövelmann, Andreas S. Poulos, Aurel Radulescu, Peter Lindner, Jürgen Allgaier, Andreas Wischnewski, W. Antonius, Margarita Krutyeva |
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| Rok vydání: | 2015 |
| Předmět: |
chemistry.chemical_classification
Materials science Polymers and Plastics Hydrogen bond Diffusion Organic Chemistry Supramolecular chemistry Polymer Nuclear magnetic resonance spectroscopy Inorganic Chemistry chemistry.chemical_compound chemistry Chemical engineering Homoassociation Polymer chemistry Materials Chemistry Pulsed field gradient Ethylene glycol |
| Zdroj: | Macromolecules. 48:8933-8946 |
| ISSN: | 1520-5835 0024-9297 |
| DOI: | 10.1021/acs.macromol.5b02060 |
| Popis: | In this work we present a combined analysis of small-angle neutron scattering, linear rheology and pulsed field gradient nuclear magnetic resonance spectroscopy experiments on the supramolecular association and chain structure of well-defined telechelically modified poly(ethylene glycol) (PEG) in the bulk. Oligomeric PEG was functionalized with directed heterocomplementary hydrogen-bonding end-groups, thymine (Thy) and diaminotriazine (DAT). The polarity of the backbone polymer is comparable to the end groups and avoids clustering of the groups basing on energetic arguments. Their linear association behavior in the ideal melt state was investigated on the microscopic/molecular level as a function of temperature. By means of a selective labeling scheme, which should ideally lead to the formation of alternating hydrogeneous-deuterated building block sequences if the hydrogen bonding reaction is exclusively heterocomplementary, we showed that the Thy–DAT association is dominant and a Thy–Thy homoassociation ... |
| Databáze: | OpenAIRE |
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