Effect of Polymer Structure and Incorporation of Nanoparticles on the Behavior of Syndiotactic Polypropylenes

Abstract

Artículo de publicación IS

Effect of functionalized trititanate nanotubes on the properties of crosslinked cationic polymer nanocomposite

“…An analysis of mechanical properties such as hardness is necessary to determine the resistance of the materials under known stress, providing useful information about the performance of the nanocomposite particles and the effect of nanoparticles on the reinforcement. The hardness value is a measure of a material's resistance to local surface deformation and gives a measure of nanocomposite particle hardness, and its values involve a combination of other mechanical parameters such as elastic modulus, yield strength and toughness …”

“…The hardness value is a measure of a material's resistance to local surface deformation and gives a measure of nanocomposite particle hardness, and its values involve a combination of other mechanical parameters such as elastic modulus, yield strength and toughness. 43 The test performed produces a permanent deformation of the surface, which could be related to the rupture of the polymer matrix network or relative slipping between the heterogeneous phases at the near-surface area, such as the interface between the TiO 2 NTs and the polymeric matrix in the present system. The mechanical properties of the nanocomposites were evaluated using a microhardness assay for samples in the xerogel state.…”

Polystyrene Macroporous Magnetic Nanocomposites Synthesized through Deep Eutectic Solvent-in-Oil High Internal Phase Emulsions and Fe3O4 Nanoparticles for Oil Sorption

“… 34 − 38 The incorporation of particles can increase emulsion stability due to particles’ tendency to adsorb quasi-irreversibly to the oil–water interface, which avoids the phenomena of coalescence and Ostwald ripening. 39 − 43 After HIPE polymerization, particles remain embedded onto the porous surface of the resultant (nano)composite polyHIPE. Thus, the use of particles in HIPE formulation not only can replace or reduce the amount of surfactant but also is an accessible method for surface porous functionalization.…”

“…Thus, the use of particles in HIPE formulation not only can replace or reduce the amount of surfactant but also is an accessible method for surface porous functionalization. 39 , 40 It has been reported that nanocomposite materials with different properties (e.g., mechanical, 26 , 41 , 42 thermal, 43 electrical, 44 magnetic, 38 , 45 lipophilic 38 , 45 ) can be obtained by the inclusion of nanoparticles. For instance, nanoparticles (NPs) of silicon carbide, 46 magnetite (Fe 3 O 4 ), 47 , 48 carbon nanotubes, 26 and cellulose 49 have allowed improvement of lipophilic properties that enhance the oil absorption performance of different nanocomposite polyHIPEs.…”

“…The structure of HIPEs consists of polyhedral and polydisperse droplets separated by a thin film of the continuous phase that can be polymerized to yield 3D macroporous materials commonly known as polyHIPEs. , The porous structure of these materials can be easily tailored by modifying the concentration and type of surfactant, the internal to continuous phase volume ratio, the cross-linked concentration used in HIPE formulation, , and the initiation locus of HIPE polymerization. − In addition to surfactants, emulsions can be also stabilized with different types of particles (ranging from micrometers to nanometers), which are known as Pickering HIPEs. − The incorporation of particles can increase emulsion stability due to particles’ tendency to adsorb quasi-irreversibly to the oil–water interface, which avoids the phenomena of coalescence and Ostwald ripening. − After HIPE polymerization, particles remain embedded onto the porous surface of the resultant (nano)­composite polyHIPE. Thus, the use of particles in HIPE formulation not only can replace or reduce the amount of surfactant but also is an accessible method for surface porous functionalization. , It has been reported that nanocomposite materials with different properties (e.g., mechanical, ,, thermal, electrical, magnetic, , lipophilic , ) can be obtained by the inclusion of nanoparticles. For instance, nanoparticles (NPs) of silicon carbide, magnetite (Fe 3 O 4 ), , carbon nanotubes, and cellulose have allowed improvement of lipophilic properties that enhance the oil absorption performance of different nanocomposite polyHIPEs.…”