Melt-Processable Shape-Memory Hydrogels with Self-Healing Ability of High Mechanical Strength
| Autor: | Marc Behl, Oguz Okay, Volkan Can, Ulrich Nöchel, Andreas Lendlein, Cigdem Bilici |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
chemistry.chemical_classification
Acrylate Materials science Polymers and Plastics Organic Chemistry 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Micelle 0104 chemical sciences Inorganic Chemistry chemistry.chemical_compound Compressive strength Pulmonary surfactant Chemical engineering chemistry Polymer chemistry Self-healing hydrogels Materials Chemistry Side chain 0210 nano-technology Alkyl Acrylic acid |
| Zdroj: | Macromolecules. 49:7442-7449 |
| ISSN: | 1520-5835 0024-9297 |
| DOI: | 10.1021/acs.macromol.6b01539 |
| Popis: | We present here a synthetic strategy for the preparation of melt-processable shape-memory hydrogels with self-healing ability. The supramolecular hydrogel with a water content of 60–80 wt % consists of poly(acrylic acid) chains containing 20–50 mol % crystallizable n-octadecyl acrylate (C18A) segments together with surfactant micelles. The key of our approach to render the hydrogel melt-processable is the absence of chemical cross-links and the presence of surfactant micelles. At temperatures above the melting temperature Tm of the crystalline domains of alkyl side chains, the hydrogel liquefies due to the presence of surfactant micelles effective for solubilizing the hydrophobic C18A segments. At this stage, it can easily be shaped into any desired form by pouring into molds. Cooling below Tm and removing the surfactant from the gel network results in a hydrogel of any permanent shape with a particularly high compressive strength of 90 MPa and a Young’s modulus of 26 MPa. If the hydrogel was damaged on p... |
| Databáze: | OpenAIRE |
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