Preparation and characterization of organic/inorganic hybrid epoxy networks from reactive inorganic precursors

Abstract

International audienceOrganic/inorganic hybrid networks were prepared by a novel solvent-free two-step synthesis method. In the first step, prehydrolyzedcondensed reactive inorganic precursors (clusters) were prepared by a solgel process from monomeric alkoxysilanes with amino and glycido groups. The second step comprised their addition into epoxy resin and amine hardener, followed by the reaction of all components giving the final hybrid crosslinked materials. Their structure was evaluated by small-angle X-ray scattering, transmission electron microscopy, scanning electron microscopy, and dynamic mechanical and thermal analysis. The morphology of the organic/inorganic hybrid structures formed from glycidoprecursor revealed spherical silica-rich domains forming agglomerates with diameter from 100 to 500 nm. The aminoprecursor led to large highly condensed and branched silicon-rich structures. The organic/inorganic hybrid networks obtained from this precursor consisted of mixed siliconorganic phases covalently interconnected via epoxyamine bonds. Such hybrid networks showed significantly improved thermomechanical properties and better resistance against thermooxidation when compared with the neat epoxyamine network. Thin films as well as bulk materials were successfully prepared by this process

Plasticizing and Reinforcing Features of Siloxane Domains in Amine‐Cured Epoxy/Silica Hybrids

“…In Figure 6 are shown the WAXS scattering profiles of Ep‐M, Ep‐Si8‐M, and Ep‐Si22‐M hybrid samples. The scattering profile of Ep‐M shows two characteristic broad bands with maxima located at 2 Θ ≈ 5.4 and 17.3°, respectively, attributed to local density fluctuations of epoxy network 29, 30…”

The Prospect of Using Ti-Containing Epoxyurethane Composites in Solar Energy

“…Íауковий інтерес до таких матеріялів зумовлений поєднанням у них переваг органічних полімерів (еластичности, малої ваги, хорошої ударостійкости) з такими неорганічних оксидів (твердістю, хемічною стабільністю, прозорістю), що поліпшує загальні властивості гібридних полімерів, такі як стійкість до подряпин і стирання, термічна стабільність тощо. Водночас шляхом зміни складу композиції ці властивості можна легко реґулювати, враховуючи умови конкретного застосування [4][5][6][7]. Зокрема, захисні оптично прозорі покриття на основі наповнених полімерів уможливлюють істотно подовжити термін служби та підвищити ефективність напівпровідникових сонячних елементів (СЕ) [8,9].…”

Improved epoxy thermosets by the use of poly(ethyleneimine) derivatives

“…Many sol-gel hybrid materials have been prepared by different curing methodologies [191]. In order to obtain good mechanical properties, the compatibility of organic and inorganic structures by the formation of covalent bonding is an essential condition, and for this reason, the use of coupling agents is needed [192,193]. Usually, commercially available trialkoxysilyl compounds with organic reactive groups are applied as coupling agents in epoxy hybrids, with (3-glycidyloxypropyl)trimethoxysilane (GPTMS) being the most widely used [194,195].…”