Fabrication and properties of novel superparamagnetic, well – Dispersed waterborne Polyurethane/Ni–Zn ferrite nanocomposites

Synthesis, physicochemical, and antimicrobial characteristics of novel poly(urethane-siloxane) network/silver ferrite nanocomposites

“…Water absorption values of NP-PU films with AgFeO 2 @PEG nanoparticles were higher than for pure PU and for AgFeO 2 /PU-50 films, indicating the lower hydrophobicity of NP-PU materials. However, the obtained results showed that water absorption values of prepared NP-PU films with AgFeO 2 @PEG nanoparticles were lower compared to polyether-based WPU with Ni 0.3 Zn 0.7 Fe 2 O 4 nanoparticles coated with 3-(triethoxysilyl) propyl isocyanate (in the range from 10.32 to 15.89%), indicating improved water resistance of the prepared NP-PU nanocomposites in the current study [44].…”

“…According to the literature, the thermally weakest linkages in PUs are urethane bonds of the hard segments [17][18][19][20], and therefore, NP-PU materials with higher content of hyperbranched polyester were thermally less stable than NP-PUs with higher soft segment content [65]. The thermal stability of the NP-PU films with AgFeO 2 @PEG nanoparticles was greater than that of WPU with Ni 0.3 Zn 0.7 Fe 2 O 4 nanoparticles coated with 3-(triethoxysilyl) propyl isocyanate [44]. This could be due to the stronger interaction between AgFeO 2 @PEG nanoparticles and PU matrix, caused by cross-linking hydrogen bonds in the PU (confirmed by FTIR analysis).…”

“…They found the nanoparticles to be evenly distributed in the polymer, which they attributed to the high cross-linking density and rapid cross-linking capability of the dendritic structure within the waterborne poly(urethane urea) matrix. Chen et al [44] demonstrated that coating Ni 0.3-Zn 0.7 Fe 2 O 4 (NZFO) nanoparticles with 3-(triethoxysilyl) propyl isocyanate (IPTS) led to a marked improvement in their dispersibility in the waterborne PU matrix and stated ''the introduction of NZFO-IPTS enhanced the thermal behavior and mechanical properties'' of the waterborne PU. Agarwal et al [45] prepared nanocomposites of Ni 0.5 Zn 0.5 Fe 2 O 4 /PU and indicated that increasing nanofiller concentration ([ 1 wt%) weakens the final PU, because of irregular distribution and agglomeration.…”

The influence of Ni/Mg content of synthetic Mg/Ni talc on mechanical and thermal properties of waterborne polyurethane nanocomposites

“…Aiming to improve these properties the addition of nanofillers has been studied. Literature describes the incorporation of silica nanohybrids [12], TiO 2 [13], cellulose nanofilers [14], Fe 2 O 3 [15], Ni-Zn [16,17], SiO 2 [18], carbon nanofillers [19], clays and carbon nanotubes [20], Ni 0.3 Zn 0.5 Fe 2 O 4 nanoparticles [21], synthetic talc [22], ferrite nanoparticles [23][24][25], ZnO [24], graphite [26], graphene oxides [27], nanoclay [28,29] functionalized clays [30].…”

Investigating the Effect of Zn Ferrite Nanoparticles on the Thermomechanical, Dielectric and Magnetic Properties of Polymer Nanocomposites

“…These unique properties make polymer nanocomposites, especially those filled with magnetic inclusions, suitable for advanced applications in various fields such as chemical sensors, magnetic recording materials, molecular electronic, electric catalysis, electro-magnetic interference (EMI) shielding, rechargeable battery, microwave absorption materials and corrosion protection coatings [2,3,4,5,6,22,23,24]. The vast majority of studies in the field investigate the properties of either composites containing non-stoichiometric zinc ferrite nanoparticles, where part of Zn is substituted by metallic ions like Ni or Co, or zinc ferrite incorporated in a conductive polymer matrix like PANI or PP [25,26,27,28,29,30,31,32]. In this study pure stoichiometric zinc ferrite nanoparticles have been incorporated in an insulating epoxy matrix, targeting to study the multifunctional behavior of the produced nanocomposites by assessing their thermal, thermomechanical, electrical and magnetic properties.…”