期刊
MACROMOLECULES
卷 50, 期 8, 页码 3333-3346出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.macromol.7b00319
关键词
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资金
- Marie Curie ITN project SASSYPOL (EU-FP7-PEOPLE-ITN) [607602]
- Ministry of Education, Culture and Science of The Netherlands [024.001.035]
We report the preparation and structural and mechanical characterization of a tough supramolecular hydrogel, based exclusively on hydrophobic association. The system consists of a multiblock, segmented copolymer of hydrophilic poly(ethylene glycol) (PEG) and hydrophobic dimer fatty acid (DFA) building blocks. A series of copolymers containing 2K, 4K, and 8K PEG were prepared. Upon swelling in water, a network is formed by self-assembly of hydrophobic DFA units in micellar domains, which act as stable physical cross-link points. The resulting hydrogels are noneroding and contain 75-92 wt % of water at swelling equilibrium. Small-angle neutron scattering (SANS) measurements showed that the aggregation number of micelles ranges from 2 X 10(2) to 6 x 10(2) DFA units, increasing with PEG molecular weight. Mechanical characterization indicated that the hydrogel containing PEG 2000 is mechanically very stable and tough, possessing a tensile toughness of 4.12 MJ/m(3). The high toughness, processability, and ease of preparation make these hydrogels very attractive for applications where mechanical stability and load bearing features of soft materials are required.
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