Structure and thermal behavior of PMMA–polysilsesquioxane organic–inorganic hybrids

Effects of thermal treatment on the structure and luminescent properties of Eu 3+ doped SiO 2 –PMMA hybrid nanocomposites prepared by a sol–gel process

“…We can see that the three spectra present practically the same profile, indicating that the TT did not modify the basic structure of the hybrids and the organic phase was not decomposed. An absorption band located at approximately 1115 cm À 1 , assigned to Si-O-Si symmetric stretching vibrations [2], can be observed, indicating the formation of silica networks derived from the polycondensation reactions of silanol groups formed by TMSM hydrolysis. Furthermore, bands at 1164 cm À 1 (Si-O stretching), 848 cm À 1 (Si-O stretching) and 690 cm À 1 (Si-O-Si bending) confirm the formation of condensed silicon species.…”

“…Siloxane-poly(methyl methacrylate) or SiO 2 -PMMA hybrid nanocomposites have been widely studied due to their thermal and mechanical properties [1][2][3][4], optical transparency [5], flameretardancy [6] and their applications in membranes for liquid separation [7], colored thin films prepared by organic dyes incorporation [8], coatings with low friction coefficients, good antiwear properties [9] and corrosion protection [10,11].…”

Effect of curing temperature and architectural (monolayer and bilayer) of hybrid films modified with polyethylene glycol for the corrosion protection on tinplate

“…This is associated with a lower curing temperature which did not cause cracking; however, dark spots on the film can be observed, formed by non-evaporated retained solvent during the curing process. This is related to the addition of the plasticizer PEG 1500, due to its high molecular weight and increased viscosity, which limits the evaporation of volatile organic compounds during curing after application of the films 16 .…”

“…On the other hand, hybrid films obtained through the sol-gel method are not completely efficient as the films are not thick enough and tend to be cracked. In this sense, plasticizers, like polyethylene glycol 15 or polymethyl methacrylate 16 , are used, with the purpose of increasing the layer thickness and the sol viscosity, or of enhancing the molecular flexibility and mobility to obtain uncracked films which can be submitted to mechanical deformation without failure. Additionally, it is recommended to obtain coatings with a high thickness layer in order to promote efficient barrier properties between the substrate and the environment.…”

Reinforced performances of polymethyl methacrylate/silica fume composite spherical particles used as ultra-lightweight proppants

“…[13][14][15] However, PMMA is a transparent thermoplastic material and shows poor thermal stability, which limits its applications. 16,17 On the contrary, silica fume (SF), known as micro-silica, is composed of amorphous polymorph of silicon dioxide. It exhibits high strength and excellent thermal stability due to the high Si-O bond energy.…”