Nanosilica-reinforced UV-cured polyurethane dispersion

Creep and recovery behaviors of a polythiophene-based electrorheological fluid

“…More recently, ER fluids have been developed based on semi-conducting polymers, in which the polarisability is due to motion of electrons within the suspended particles. Examples include polyaniline (PANI) and its derivatives [6][7][8][9][10], polypyrrole [11,12], and poly(p-phenylene) [13]. Extensive studies have been carried out on the rheological properties of the ER fluids under steady shear and oscillatory shear flows [1,2,[6][7][8][9][10][11][12][13], and have established that the suspensions in the presence of an electric field exhibit a yield stress, which increases with particle concentration and field strength, and above which the suspension exhibits viscous flow.…”

The effect of soft segment on the microstructure and mechanical properties of waterborne UV-curable polyurethane/silica nanocomposites

“…The research results show that the efficacy of reinforcement depends on the state of nanofiller dispersion and the interfacial interaction between the WPU matrix and the nanofillers. Numerous approaches for the compatibilization of nanofillers with the WPU matrix have been proposed in recent years, including the use of in situ polymerization [11] or phase-inversion emulsification [16], nanofillers surface modification [15], and silanized polyurethane [12].…”

“…This limits its use in industrial coatings which requires high-performance, formerly set by 100 % UV coatings. The incorporation of nano-sized fillers, such as clay [7,8], silica [9][10][11][12][13][14][15][16], carbon nanotubes [17,18], polyhedral oligomeric silsesquioxanes (POSS) [19,20], ZnO [21], and cellulose nanocrystals [22,23], into the WPU matrix is an effective strategy for enhancing the properties of WPU films. The research results show that the efficacy of reinforcement depends on the state of nanofiller dispersion and the interfacial interaction between the WPU matrix and the nanofillers.…”

Oligoetherols and polyurethane foams obtained from metasilicic acid

“…Yang et al demonstrated that colloidal silica led to considerable increase of thermal stability of polyurethane foil in comparison with the non-modified foil [7]. When talc, mica, or montmorillonite are used as fillers they need to intercalate with amino acids, ammonium, or phosphonium salts [8], otherwise the fillers separate from compositions. Proper homogenization of silica nanoparticles with polyurethane led to materials of improved mechanical and thermal properties as well as the flame resistance, although these materials had diminished ability to form pores [9][10][11][12].…”