Organic–inorganic hybrid coatings were obtained by a dual-curing process combining the sol–gel reaction with the UV-induced polymerization technique by starting from bisphenol A ethoxylate (15 EO/phenol) dimethacrylate (BEMA, as organic network former), methacryloyloxypropyl-trimethoxysilane (MEMO, as coupling agent) and tetraethoxysilane (TEOS, as inorganic silica network precursor). For comparison, TEOS was also substituted with preformed silica nanoparticles. Scratch test was carried out in order to study the scratch resistance of that silica reinforced acrylic resins. Excellent scratch resistant coatings were obtained by UV and sol–gel dual curing process. On the contrary, coatings with very poor scratch resistance were obtained by dispersing preformed nano-silica into the acrylic resin indicating the key role played by the morphology of the inorganic filler and its interaction with the organic matrix.

Scratch resistance of nano-silica reinforced acrylic coatings

Quantitative modeling of scratch behavior of amorphous polymers at elevated temperatures

Experimental and FEM analysis of mar behavior on amorphous polymers

Experimental observation and finite element method modeling on scratch‐induced delamination of multilayer polymeric structures

Scratch behavior of polycarbonate by Rockwell C diamond indenter under progressive loading

Experimental and numerical determination of adhesive strength in semi-rigid multi-layer polymeric systems

This study investigates the rheological properties of dual-network hydrogels based on acrylamide and sodium alginate under large deformations. The concentration of calcium ions affects the nonlinear behavior, and all gel samples exhibit strain hardening, shear thickening, and shear densification. The paper focuses on systematic variation of the alginate concentration—which serves as second network building blocks—and the Ca2+-concentration—which shows how strongly they are connected. The precursor solutions show a typical viscoelastic solution behavior depending on alginate content and pH. The gels are highly elastic solids with only relatively small viscoelastic components, i.e., their creep and creep recovery behavior are indicative of the solid state after only a very short time while the linear viscoelastic phase angles are very small. The onset of the nonlinear regime decreases significantly when closing the second network (alginate) upon adding Ca2+, while at the same time the nonlinearity parameters (Q0, I3/I1, S, T, e3/e1, and v3/v1) increase significantly. Further, the tensile properties are significantly improved by closing the alginate network by Ca2+ at intermediate concentrations.

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Shuoran Du

Papers

Experimental and numerical determination of adhesive strength in semi-rigid multi-layer polymeric systems

Quantitative modeling of scratch behavior of amorphous polymers at elevated temperatures

Experimental and FEM analysis of mar behavior on amorphous polymers

Experimental observation and finite element method modeling on scratch‐induced delamination of multilayer polymeric structures

Understanding Gel-Powers: Exploring Rheological Marvels of Acrylamide/Sodium Alginate Double-Network Hydrogels