Dispersion Behavior of TiO₂ Nanoparticles in LLDPE/LDPE/TiO₂ Nanocomposites

Abstract

Summary: TiO2 nanoparticles were introduced into linear low‐density polyethylene (LLDPE)/low‐density polyethylene (LDPE) composite films in the form of master batch where TiO2 was pre‐dispersed in LDPE by melt compounding. The dispersion behavior of TiO2 nanoparticles was investigated by field‐emission scanning electron microscopy (FE‐SEM). The rheology results show that the viscosity of LDPE/TiO2 master batch is lower than that of LLDPE/LDPE composites. Energy dispersive X‐ray spectrometer (EDS) composition distribution map indicates that TiO2 nanoparticles were dispersed randomly in the master batch. Scanning electron microscopy (SEM) images show that LDPE/TiO2 master batch is crushed into micron scale dispersed phases due to the shear stress during the blow‐forming process. Subsequently, TiO2 nanoparticles in the dispersed phases are released into the ambient matrix and form a wide ring composed of monodispersed particles. The sizes of spherical crystals decrease due to the presence of TiO2 nanoparticles in LLDPE/LDPE/TiO2 nanocomposites. The transparency of LLDPE/LDPE/TiO2 composite films decreases little compared to that of LLDPE/LDPE composite films.SEM image of TiO2 nanoparticles dispersed randomly in LLDPE/LDPE/TiO2 composite films.magnified imageSEM image of TiO2 nanoparticles dispersed randomly in LLDPE/LDPE/TiO2 composite films.

Increasing the shelf life of pikeperch (Sander lucioperca) fillets affected by low-density polyethylene/Ag/TiO2 nanocomposites experimentally produced by sol-gel and melt-mixing methods

“…The attachment of Ag + from the TiO 2 NPs may bestow antimicrobial properties. [5,8] Gupta et al [26] reported that Ag-TiO 2 nanocomposites having Figure 11. (a and b) LDPE produced using 0.5% Ag and 2.5% TiO 2 as well as 1% of silver, which were produced by the sol-gel method.…”

“…According to the method of Wang and colleagues, [5] the samples were completely cleaned and dried to obtain a high energy electron beam for imaging and chemical analysis. The samples were placed on stubs, and electrical contact between the stubs and samples was generated.…”

“…Transmission electron microscopy has been used to observe this process at high magnification. [5] This approach can produce a nanocomposite that prevents the growth of pathogens and microbial colonization of polymers. [6] Among the nanocomposites, the photocatalyst, titanium dioxide (TiO 2 ), has been effectively applied to tap water to inactivate bacteria.…”

“…[8] Numerous electron-sized holes will be made on TiO 2 , and the OH introduced to photons with an energy larger than the band gap of TiO 2 . The OH − attaches to the pathogens and inactivates them [5] by degrading the organic components through the oxidization of the C-H bonds in the polyunsaturated phospholipid constituent of the bacterial cell wall [9,10] These three forms of ROS are released by the reaction of TiO 2 . TiO 2 -covered thin layers can reduce microbial contamination on the surface of food products.…”

High performance polyethylene nanocomposite fibers

“…For instance, Chaichana et al [16] developed a novel route to synthesize linear low density polyethylene (LLDPE)/nanosilica systems via in situ polymerization with a zirconocene/methyl alumoxane (MAO) catalyst, in order to study the effect of particle size on the catalytic properties of the resulting materials. The effect of silica and zirconia nanoparticles on the microstructure of LLDPE nanocomposites synthesized via in situ polymerization with zirconocene was investigated by Jongsomjit et al [17], while Wang et al [18] analyzed the dispersion behaviour of titania (TiO 2 ) nanoparticles in polyolefin nanocomposites. In recent years an extended investigation was carried out by this research group on the viscoelastic and the fracture behavior of polyolefin based nanocomposites [19][20][21][22][23].…”