| In recent years,with the progress of science and technology,people have found that there are many surfaces with extreme interfacial wettability in nature which are worthy of our study.Among these surfaces,superhydrophobic and underwater ulta-hydrophobic surfaces have attracted extensive attention from researchers because of their huge application prospects,resulting in a number of biomimetic superhydrophobic and underwater superoleophobic surfaces.Generally,these underwater superoleophobic materials have two key characteristics,surface with multiscale roughness and the extremely hydrophilic chemical composition of the surface which can form a hydration layer on the surface to minimize contact with oily liquids.Although these attractive characteristics could result in applications of superoleophobic surface,a primary challenge,difficult to maintain function in harsh environments due to their poor mechanical properties and poor stability,still remains for the development of superoleophobic surface due to the necessity of multiscale roughness on the surface.As common inorganic nanoparticles,silica nanoparticles can be used not only to build the roughness of micro and nano-scale structures,but also to toughen the polymer matrix.More importantly,through different silane coupling agents,different functional groups can be introduced into the surface to react with different monomers,which is an ideal raw material for the construction of oil-repellent materials with excellent stability or mechanical properties.Overall,in this thesis,the hybrid nanoparticles/epoxy resin coating and interpenetrating-network nanocomposite hydrogel were prepared by based on MPS-SiO2 nanoparticles.the main research contents and conclusions were as follows:(1)A facile and environmentally friendly synthesis of MPS-SiO2/PNIPAM hybrid nanoparticles was used to prepare hybrid nanoparticles/epoxy resin coating(HN/ER-coating)by the seeds to conduct precipitation polymerization,and the HN/ER-coating can be cast onto various substrates by means of a simple solution-casting method.Moreover,the HN/ER-coating displayed excellent underwater superoleophobicity(OCA=160.7 ± 1.42°)and robust resistance to mechanical abrasion;even maintain highly stability in acidic,alkaline,and salty environments.Importantly,the HN/ER-coating also shows outstanding anti-corrosive(inhibition efficiency=47.3%)and anti-biofouling properties.It is able to effectively prevent the carbon steel corrosion and biofouling-resistant in harsh environment,which could expand potential applications in industrial fields,such as underwater instruments,underwater oil transport and especially underwater coatings.(2)A rubber-like(high elasticity,fast self-recovery after large tensile or compression deformation),interpenetrating-network MPS-SiO2/CS/P(AM-co-AA)nanocomposite hydrogel(SIPN-Gels)are obtained by using a simple in situ free-radical polymerization method.The SIPN-Gels9:1 possessed.high tensile strength(57.3 ± 2.4 kPa),tensile strain,excellent load-bearing capacity,self-healing and remarkable fast self-recovery property.The excellent mechanical properties of SIPN-Gels9:1 originated from synergetic interactions of CS physical networks and MPS-SiO2 crosslinked P(AM-co-AA)covalent network,wherein the disruption of CS network and dynamic entanglement-disentanglement of SNP-P(AM-co-AA)network effectively dissipated energy while the P(AM-co-AA)network maintained hydrogel integrity during deformational process.Notably,the obtained SIPN-Gels9:1 has hierarchically porous structure and exhibits outstanding underwater superoleophobicity,which is highly stability in different water environments(including base,strong ionic strength),and it is able to effectively separate oil from the mixture of oil and water(separation efficiency>99%).This new type of nanocomposite hydrogel expands potential applications in industrial fields,including underwater oil transport,flexible and wearable oil-repellent or oil/water separation materials. |
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