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Advances in nanotechnology have boosted the development of more efficient materials, with emerging sectors (electronics, energy, aerospace, etc.) demanding novel materials to fulfill the complex technical requirements of their products. This is the case of polymeric foams, which may display good structural properties alongside functional characteristics through a complex composition and (micro)structure in which a gas phase is combined with rigid ones, mainly based on nanoparticles, dispersed throughout the polymer matrix. In recent years, there has been an important impulse in the development of nanocomposite foams, extending the concept of nanocomposites to the field of cellular materials. This, alongside developments in new advanced foaming technologies which have allowed the generation of foams with micro, sub-micro, and even nanocellular structures, has extended the applications of more traditional foams in terms of weight reduction, damping, and thermal and/or acoustic insulation to novel possibilities, such as electromagnetic interference (EMI) shielding. This Special Issue, which consists of a total of 22 articles, including one review article written by research groups of experts in the field, considers recent research on novel polymer-based foams in all their aspects: design, composition, processing and fabrication, microstructure, characterization and analysis, applications and service behavior, recycling and reuse, etc.

graphene oxide --- n/a --- microstructure --- multi-objective particle swarm optimization --- electromagnetic wave absorption --- polyamide --- lignin --- expandable microspheres --- surfactants --- aluminum microfibers --- biomaterials --- permittivity --- compression properties --- shock compression --- syntactic foams --- 1 --- impact wedge–peel test --- phenolic foams --- 3 --- foam extrusion --- energy conservation --- heat transfer --- heterogeneous nucleation --- polyurethane foam --- leaching test --- functional --- cellulose foam --- impact property --- foam injection molding --- itaconic acid --- composites --- foaming quality --- phosphorus flame retardants --- polymer waste --- metallic tube --- 5-benzene-trisamides --- polyurethane foam composites --- polyetherimide foams --- scCO2 --- Ethylene Propylene Diene Monomer --- thermal conductivity --- ethyl cellulose --- super critical CO2 --- thermal insulation --- cell nucleation --- crystalline --- polypropylene --- PZT --- burning characteristic --- foams --- quasi-static compression tests --- flame-retardant ABS microcellular foams --- nanotubes --- conductivity --- energy absorption capability --- intrinsic toughness --- ternary synergistic effect --- multilayers --- absorbent PMI foam --- semi-rigid polyurethane foams --- phosphorus --- EMI --- supramolecular additives --- MuCell® injection-molding foaming --- piezocomposite --- ultrasonication --- scCO2 foaming --- automobile structural adhesives --- thermogravimetric analysis --- rigid polyurethane foam --- failure mechanism --- mechanical properties --- multifunctional foams --- SANS --- fluoelastomer --- sound absorption coefficient --- acoustic performances --- functional foam --- foam morphology --- mechanical property --- polystyrene foams --- piezoelectric --- graphene --- Pluronic --- epoxy composite foam adhesive --- polymers --- flame retardancy --- core–shell rubber --- extrusion foaming --- equation of state --- cellulose nanofiber --- epoxy --- DOPO --- PUR --- grey relational analysis --- activation energies --- adjacent façade --- electrical conductivity --- impact wedge-peel test --- core-shell rubber --- adjacent façade