Tough and durable hydrogels with robust skin layers formed via soaking treatment.

作者: Guoqiang Guo , Yuanzhou Chen , Xiaoyu Liu , Dong Yu Zhu , Bo Zhang

DOI: 10.1039/C8TB02540A

关键词:

摘要: Recent progress has seen significant advances in the mechanical performances of synthetic hydrogels. However, mechanics hydrogels usually suffer drastic degradation under repetitive and complicated environmental loadings. Here, we fabricate a class biocompatible layered poly(vinyl alcohol) by simply soaking preformed gel sodium silicate. The resulting exhibit combination superior good biocompatibility, along with exceptional chemical robustness. structure is composed compact cover layer porous center layer. Both layers are alcohol). network crosslinked ordered polarized H-bonds swelling stability, while confines large volume interstitial water. structural crosslinking metric confers capabilities to tolerate loads. optimized tough (fracture energy >10 kJ m−2) strong stress ≈ 5 MPa). strengthening mechanism can be correlated structure, which causes impeded flow Their performance maintained acidic/alkaline, concentrated electrolytes, presence salting-in H-bond-breaking reagents even at elevated temperatures. We speculate that dipole–dipole pairings Oδ−–Hδ+⋯ Oδ−–Hδ+ probably generate hydrophobic microdomains. This swelling-resistant interaction may protect from complex aqueous envrionments. also discuss possible formation structures their crosslinkings.

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