Journal
MACROMOLECULAR RAPID COMMUNICATIONS
Volume 38, Issue 20, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/marc.201700351
Keywords
double network; hydrogels; thermoresponsive; zwitterionic
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Funding
- NIH/NIDDK [1R01DK095101-01A1]
- NSF Graduate Research Fellowship Program (NSF-GRFP)
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The utility of thermoresponsive hydrogels, such as those based on poly(N-isopropylacrylamide) (PNIPAAm), is severely limited by their deficient mechanical properties. In particular, the simultaneous achievement of high strength and stiffness remains unreported. In this work, a thermoresponsive hydrogel is prepared having the unique combination of ultrahigh compressive strength (approximate to 23 MPa) and excellent compressive modulus (approximate to 1.5 MPa). This is accomplished by employing a double network (DN) design comprised of a tightly crosslinked, highly negatively charged 1st network based on poly(2-acrylamido-2-methylpropane sulfonic acid (PAMPS) and a loosely crosslinked, zwitterionic 2nd network based on a copolymer of thermoresponsive NIPAAm and zwitterionic 2-(methacryloyloxy)ethyl]dimethyl-(3-sulfopropyl) ammonium hydroxide (MEDSAH). Comparison to other DN designs reveals that this PAMPS/P(NIPAAm-co-MEDSAH) DN hydrogel's remarkable properties stem from the intra- and internetwork ionic interactions of the two networks. Finally, this mechanically robust hydrogel retains the desirable thermosensitivity of PNIPAAm hydrogels, exhibiting a volume phase transition temperature of approximate to 35 degrees C.
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