期刊
BIOMACROMOLECULES
卷 18, 期 4, 页码 1162-1171出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.biomac.6b01841
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资金
- National Institutes of Health [R21NS095250]
- Defense Advanced Research Projects Agency [D14AP00040]
- National Science Foundation [DMR1542196, CHE-0130903, CHE-1039870]
- Carnegie Mellon University (CMU) School of Engineering
- Ministry of Science and Technology of Taiwan [104-2917-1-564-005-A1]
Stimulus-responsive hydrogels make up an important class of programmable materials for a wide range of biomedical applications. Ultrasound (US) is a stimulus that offers utility because of its ability to permeate tissue and rapidly induce chemical alterations in aqueous media. Here we report on the synthesis and US-mediated disintegration of stimulus responsive telechelic Dopa-modified polyethylene glycol-based hydrogels. Fe3+-[PEG-Dopa](4) hydrogels are formed through Fe3+-induced cross-linking of four-arm polyethylene glycol-dopamine precursors to produce networks. The relative amounts of H-bonds, coordination bonds, and covalent bonds can be controlled by the [Fe3+]:[Dopa] molar ratio in precursor solutions. Networks formed from precursors with high [Fe3+]:[Dopa] ratios create mechanically robust networks (G' = 6880 +/- 240 Pa) that are largely impervious to US-mediated disintegration at intensities of <= 43 W/cm(2). Conversely, lightly cross-linked networks formed through [Fe3+]:[Dopa] molar ratios of <0.73 are susceptible to rapid disintegration upon exposure to US. Pulsatile US exposure allows temporal control over hydrogel disintegration and programmable self-healing. Sustained US energy can also stabilize hydrogels through the formation of additional cross-links-via free radical-mediated coupling of pendant catechols. Taken together, the diverse ranges of mechanical behavior, self-healing capability, and differential susceptibility to ultrasonic disintegration suggest that Fe3+- [PEG-Dopa](4) hydrogels yield a class of application-specific stimulus-responsive polymers as smart materials for applications ranging from transient medical implants to matrices for smart drug delivery.
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