Preparation of double network hydrogel wound dressing based on starch/hyaluronic acid through host-guest interaction and Diels-Alder reaction.

An ideal wound dressing should possess multiple functions such as self-healing, antibacterial properties, and biodegradability. To achieve this goal, this study utilized the host-guest interaction between adamantane groups and β-cyclodextrin, as well as the Diels-Alder reaction between furan groups and maleimide groups, to prepare a novel dual-network hydrogel (DN-Gel) based on starch and hyaluronic acid. The preparation conditions of DN-Gel were optimized through single-factor experiments.

Self-healing hyaluronic acid/polylysine hydrogel prepared by dual-click chemistry from polyrotaxane slidable crosslinkers.

A new type of pH-sensitive hydrogel containing supramolecular structures was fabricated from maleimide-functionalized polyrotaxane, ɛ-polylysine and furan-functionalized hyaluronic acid by Diels-Alder reaction and amino-maleimide reaction. Firstly, pseudo polyrotaxane was obtained through self-assembly of polyethylene glycol and α-cyclodextrin, and then capped with 1-adamantanecarboxylic acid to convert it into polyrotaxane. Secondly, a maleimide-functionalized slidable crosslinker was obtained by modifying the polyrotaxane with 3-maleimide propionic acid, and furan-functionalized hyaluronic acid was prepared by modifying it with 2-furanmethylamine.

Durable fire retardant, superhydrophobic, abrasive resistant and air/UV stable coatings.

Fabric-based materials such as textiles and papers are widely used in our daily life. However, most of conventional fabrics are highly combustible and easily stained by water and household liquids, susceptible to fire risks and surface contamination/staining. Herein, a non-fluorinated coating that contains the flame-retardants ammonium polyphosphate/pentaerythrotol (APP/PER) and water-repellent silica nanoparticles-polydimethylsiloxane (SiO@PDMS) is developed.

Modifying Epoxy Resins to Resist Both Fire and Water.

In this work, we converted inherently hydrophilic and flammable epoxy resins to resist both fire and water. This was achieved by integrating surface modified flame-retardant CoFeO nanoparticles into the epoxy resin. The modified CoFeO nanoparticles reduce the peak heat release rate, peak smoke production release and CO production in the CoFeO/epoxy resin nanocomposite by 39.