Microstructure study of acrylic polymer-silica nanocomposite surface by scanning force microscopy

P(EMA-co-HEA)/SiO2 hybrid nanocomposites for guided dentin tissue regeneration: structure, characterization and bioactivity.

“…Nevertheless, despite the increase in the rubbery modulus with the increase of silica acting as reinforcing agent, the mechanical relaxation of the copolymer does not disappear after a 20 wt% of silica. In agreement with other authors [91,154] , this shows that although the glass transition is hardly noticeable in calorimetric measurements, it has not disappeared from the hybrids, because it is still detected by dynamicmechanical analysis through its associated main relaxation. This suggests that both polar carboxyl and hydroxyl groups are effective apatite nucleators, but textural and physical properties such as swelling and polarity and mechanical modulus of the surfaces are also relevant.…”

“…Nonetheless, the silica network hinders the polymer chain motions, broadening the glass transition process. The vanishing of the calorimetric glass transition with the increase in silica content has already been observed by other authors [91,154] . They attributed the absence of clear calorimetric glass transition to the confinement of polymer chains in domains smaller than 15 nm, from which the characteristic long distance motions of the glass-transition phenomenon are restricted.…”

Synthesis and properties of organic‐silica nanocomposites with perhydropolysilazane

“…59,63,64 When PHPS was used, the thermal stability of the composite depends on the preparation method. 51 Figure 4 shows thermal degradation behavior of PMMA, PMMA-block-PHEMA and PMMAsilica nanocomposites prepared by blending the solution (a solution method) and by soaking the microphase-separated film into the PHPS solution (a soaking method).…”

Acrylate-silica polymer nanocomposites obtained by sol-gel reactions. Structure, properties and scaffold preparation.

“…For instance, optical applications are generally out of the scope of classic micro-composites owing to their lack of transparency; however, nanocomposites may be transparent as long as their materials are also transparent and the filler average size does not surpass few hundreds of nanometres (<400 nm) [29,46].…”

“…Polymer-silica nanocomposites have received much attention in recent years both from a fundamental and an applied perspective [56]. The preparation and characterization of hybrid materials by means of inorganic precursors, such as tetramethyloxysilane (TMOS) or TEOS, have been carried out with several organic polymers: in [46] a poly(methyl methacrylate)-silica composite was prepared and its structure investigated by Nuclear Magnetic Resonance; the surface of acrylic-silica hybrids was studied by scanning force microscopy in [57] and several nanodomains were identified. X-ray analysis was extensively used with poly(dimethyl sulfone) using TEOS as a precursor [57,58].…”