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The combination of functional polymers with inorganic nanostructured compounds has become a major area of research and technological development owing to the remarkable properties and multifunctionalities deriving from their nano and hybrid structures. In this context, polyhedral oligomeric silsesquioxanes (POSSs) have increasing importance and a dominant position with respect to the reinforcement of polymeric materials. Although POSSs were first described in 1946 by Scott, these materials, however, have not immediately been successful if we consider that, starting from 1946 and up to 1995, we find in the literature 85 manuscripts regarding POSSs; which means that less than two papers per year were published over 50 years. Since 1995, we observe an exponential growth of scientific manuscripts concerning POSSs. It is changing from an annual average of 20 manuscripts for the period 1995–2000 to an annual average of about 400 manuscripts, with an increase of 2800%. The introduction of POSSs inorganic nanostructures into polymers gives rise to polymer nanostructured materials (PNMs) with interesting mechanical and physical properties, thus representing a radical alternative to the traditional filled polymers or polymer compositions.

graphene oxide --- n/a --- lithium ion battery --- liquefied --- polypropylene --- silsesquioxanes --- self-assembly behaviors --- nanocomposites --- Octavinyl-POSS --- polyimide --- thermal properties --- polyhedral oligomeric silsesquioxane-based ionic liquids --- aqueous self-assembly --- bi-functional POSS --- blends --- low refractive material --- cellular structure --- mechanism analysis --- morphology --- flame retardant --- hydrogels --- mercapto-modified --- damping --- POSS nanoparticles --- phthalonitrile polymers --- mechanical properties --- flame-retardant mechanism --- thiol-ene ‘click’ reaction --- POSS --- poly(?-caprolactone) --- siloxane-silsesquioxane resins --- polyhedral oligomeric silsesquioxane (POSS) --- surface properties --- fluoropolymer --- thiol–ene “click” reaction --- Monomethacryloxy POSS --- monodisperse --- thermogravimetry --- OLEDs --- fluorescent sensors --- double-decker-shaped silsesquioxane (DDSQ) --- dielectric constant --- composites --- organic-inorganic hybrids --- poly(?-caprolactone) nanocomposite --- POSS-based copolymer --- organic-inorganic crosslinking --- optoelectronics --- flame retardancy --- cone calorimeter tests --- lauryl methacrylate --- octa-ammonium POSS --- nitroaromatic explosives --- phthalonitrile-polyhedral oligomeric silsesquioxane copolymers --- cyanate ester --- thermoplastic polyurethane --- sodium alginate --- giant surfactant --- benzoxazine --- thermal stability --- temperature responsiveness --- polymerization kinetics --- mechanical performance --- Si@C anode --- ridgid polyurethane foams --- epoxy resin --- grafting synthesis --- direct synthesis --- filler --- bridged silsesquioxane --- hydrophobic modification --- dispersion --- polyhedral oligomeric silsesquioxanes --- anchor effect --- thiol-ene 'click' reaction --- thiol-ene "click" reaction

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This collection of research and review papers is aimed at depicting the state of the art on the possible correlations between processing variables, obtained structure and special properties which this structure induces on the plastic part. The extraordinary capacity of plastics to modify their properties according to a particular structure is evidenced for several transformation processes and for many applications. The final common goal is to take profit of this peculiar capacity of plastics by inducing, through a suitable processing, a specific spatial organization.

polymer blend --- carbon nanotube --- polycaprolactone --- X-ray diffraction --- reactive blending --- copper clad laminate --- incremental forming --- uniaxial compression --- fatigue --- nanoparticles --- composite --- deformation --- polymer composite --- humidity --- model --- uniaxial tensile deformation --- injection molding --- SPIF --- bioresorbable polymers --- flow --- poly(ethylene terephthalate) --- morphology --- 3D printing/additive manufacturing --- supercritical CO2 --- polymer morphology --- tissue engineering and regenerative medicine --- microfibrillar composites --- polyamide 6 --- ultra-high molecular weight polyethylene --- chain orientation --- processing --- intrinsic viscosity --- conductive polymer composites --- microcellular injection molding --- ionic liquids --- poly(?-caprolactone) --- biaxial elongation --- biobased films --- crystalline morphology --- gel --- composites --- PLLA --- bioresorbable vascular scaffolds --- temperature --- layered double hydroxides --- epoxy microstructure --- nanoreinforcement --- shear --- collagen --- controllable gas permeability --- contact angle --- WAXS --- mechanical performance --- biodegradable nanofibers --- in situ X-ray --- foam --- polyolefin --- carbon black --- polymorphism --- degradation --- polypropylene --- XRD --- graphite --- polyimide film --- indentation --- ultra-high molecular weight polyethylene (UHMWPE) --- mold temperature evolution --- fused filament fabrication/fused deposition modelling --- polyvinyl butyral --- supercritical fluid --- conductive filler --- octakis[(3-glycidoxypropyl)dimethylsiloxy]octasilsesquioxane (GPOSS) --- supercritical N2 --- compression molding --- flame retardant --- epinephrine --- crystallinity --- ethylene vinyl acetate --- atomic force microscopy --- temperature sensitive --- mechanical properties --- crystallisation --- microencapsulation --- linear coefficient of thermal expansion (CTE) --- structure and properties --- PLA --- isotactic polypropylene --- lidocaine --- graphene --- structural analysis --- critical gel --- Harmonix AFM --- physicochemical characterization --- polyurethane --- cavitation --- curing rate --- orientation --- breathable film --- stress-induced phase transitions --- phase transitions --- SAXS --- hydrophobicity --- melamine polyphosphate --- PLGA --- compatibilizer --- polyoxymethylene (POM) --- homogeneous dispersion --- stretch blow molding --- electrical conductivity --- poly(lactic acid)