Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 559037
Title Tuning the interactions in multiresponsive complex coacervate-based underwater adhesives
Author(s) Dompé, Marco; Cedano-Serrano, Francisco J.; Vahdati, Mehdi; Sidoli, Ugo; Heckert, Olaf; Synytska, Alla; Hourdet, Dominique; Creton, Costantino; Gucht, Jasper van der; Kodger, Thomas; Kamperman, Marleen
Source International Journal of Molecular Sciences 21 (2020)1. - ISSN 1661-6596
DOI https://doi.org/10.3390/ijms21010100
Department(s) Physical Chemistry and Soft Matter
VLAG
Publication type Refereed Article in a scientific journal
Publication year 2020
Keyword(s) Bioinspired materials - Complex coacervate - Environmentally-triggered setting process - LCST - Non-covalent interactions - Poly(N-isopropylacrylamide) - Polyelectrolytes - Underwater adhesion
Abstract

In this work, we report the systematic investigation of a multiresponsive complex coacervate-based underwater adhesive, obtained by combining polyelectrolyte domains and thermoresponsive poly(N-isopropylacrylamide) (PNIPAM) units. This material exhibits a transition from liquid to solid but, differently from most reactive glues, is completely held together by non-covalent interactions, i.e., electrostatic and hydrophobic. Because the solidification results in a kinetically trapped morphology, the final mechanical properties strongly depend on the preparation conditions and on the surrounding environment. A systematic study is performed to assess the effect of ionic strength and of PNIPAM content on the thermal, rheological and adhesive properties. This study enables the optimization of polymer composition and environmental conditions for this underwater adhesive system. The best performance with a work of adhesion of 6.5 J/m2 was found for the complex coacervates prepared at high ionic strength (0.75 M NaCl) and at an optimal PNIPAM content around 30% mol/mol. The high ionic strength enables injectability, while the hydrated PNIPAM domains provide additional dissipation, without softening the material so much that it becomes too weak to resist detaching stress.

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