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Hydrogen bonding and thermoplastic elastomers - a nice couple with temperature-adjustable mechanical properties
Elisabeth Wittenberg1, Andreas Meyer1, Steffen Eggers1
1Department of Physical Chemistry, University of Hamburg, Martin-Luther-King Platz 6, 20146, Hamburg, Germany. volker.abetz@hzg.de.
Soft Matter
|March 23, 2018
Summary
Functionalized styrene-butadiene copolymers with benzoic acid moieties form supramolecular networks via hydrogen bonding. This network influences material properties, introducing a quasi-melting transition alongside the glass transition.
Area of Science:
- Polymer Chemistry
- Materials Science
- Supramolecular Chemistry
Background:
- Styrene-butadiene copolymers are versatile synthetic materials.
- Hydrogen bonding can significantly alter polymer properties.
- Controlling supramolecular architecture is key to advanced material design.
Purpose of the Study:
- To modify styrene-butadiene copolymers with benzoic acid moieties for hydrogen bonding.
- To investigate the impact of hydrogen bonding on material properties.
- To elucidate the structure-property relationships in these functionalized copolymers.
Main Methods:
- Synthesis utilizing click chemistry to incorporate benzoic acid.
- Dynamic Mechanical Analysis (DMA) for temperature-dependent properties.
- Differential Scanning Calorimetry (DSC), Infrared (IR) spectroscopy, and Small Angle X-ray Scattering (SAXS) for structural analysis.
Main Results:
- Successful modification of copolymers with varying benzoic acid fractions.
- Formation of a supramolecular polymer network facilitated by hydrogen bonding.
- Observation of a distinct quasi-melting transition related to hydrogen bond dissociation, in addition to the glass transition.
Conclusions:
- Hydrogen bonding motifs, even simple ones, profoundly impact polymer properties by forming supramolecular networks.
- The functionalized copolymers exhibit unique thermal transitions due to the reversible nature of hydrogen bonds.
- Integrated characterization techniques confirm the link between supramolecular structure and macroscopic material behavior.
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