In situ polyurethane/silica composite formation via a sol‐gel process

Abstract

Polyurethane acrylate anionomer (PUAA)/silica composite gels were prepared by the sol-gel reaction of tetraethoxysilane (TEOS) and methacryloxypropyl trimethoxysilane (MPTS) incorporated to PUAA gels by using a swelling method. The formation and structure of composites were confirmed by FTIR, X-ray diffraction, and SEM. As a result, we found that silica components in composites are located within the ionic domains of their gels and interacted with PUAA via hydrogen bonding. This drastically enhanced the mechanical properties of the composites. Mechanical properties are also improved by MPTS, because MPTS improves the dispersibility and adhesion of silica components in PUAA/silica composite gels.

In situ polymerization of polyamide 66 nanocomposites utilizing interfacial polycondensation. III. Co‐synthesis of silica nanocomposites via sol–gel chemistry

“…5 reveals a characteristic peak appearing at 1020 cm −1 that is attributed to the formation of SiOSi bridges in the sol–gel condensation reactions [12], for both unfunctionalized and bonded silica nanocomposites. A broadening in the CN stretching peak [13] around 1578 cm −1 in the bonded as opposed to both the unfunctionalized silica nanocomposites and the neat PA66 is indicative of a reaction between the coupling agent and polyamide chains. Bonding is accomplished through amino functionalization of the silane, allowing it to react with the acidic nylon end group.…”

Integrated Compositional and Nanomechanical Analysis of a Polyurethane Surface Modified with a Fluorous Oxetane Siliceous-Network Hybrid

“…The pioneering work of Saegusa and Chujo led to development of the field of hybrid polymeric materials . The hydrolysis/condensation of silicon alkoxides to a cross-linking inorganic −SiO x -component or “sol gel chemistry” often improves mechanical and thermal properties of the resulting nanocomposites. − …”

Synthesis and Properties of UV-Curable Polyester-Based Waterborne Polyurethane/Functionalized Silica Composites and Morphology of Their Nanostructured Films

“…However, because most WPUs are linear thermoplastic polymers with hydrophilic groups in the main chain, the mechanical properties, water, and solvent resistance of these systems are lower than those of cross-linked solvent-based PUs, the development of WPUs are blocked. For the purpose of improving the properties of WPU, several methods have been researched, for example hybridizing with organics such as casein and starch and hybridizing with inorganic oxides such as silica, − titania, attapulgite, , and clay. , Of which, nanosilica is expected to offer attractive potential in WPU reinforcement. However, because of the agglomeration of inorganic oxide nanoparticles, the doping level is limited.…”