Sol–gel-derived organic–inorganic hybrid materials

Han, Yung-Hoe; Taylor, Alan R.; Mantle, Mick D.; Knowles, Kevin M.

doi:10.1016/j.jnoncrysol.2006.05.042

Cited by 129 publications

(67 citation statements)

References 30 publications

(42 reference statements)

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“…Wide variety of aggregates (e.g., spheres, vesicles, large compound spheres and vesicles) with different sizes can be obtained in selective solvents through sol-gel process [1][2][3][4][5][6][7][8]. These novel materials can have improved (mechanical, thermal etc.)…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of organic-inorganic hybrid nanomaterials using polyurethane-b-poly[3-(trimethoxysilyl) propyl methacrylate] via RAFT polymerization

Guo¹,

Zhang²,

Wang³

et al. 2010

Express Polym. Lett.

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Abstract.A series of novel block-type amphiphilic copolymers have been prepared by copolymerizing methacrylate endcapped oligo-urethane and 3-(trimethoxysilyl) propyl methacrylate (TPM) via the sol-gel process. Copolymers with welldefined end groups and narrow polydispersity were prepared through Reversible Addition Fragmentation Chain Transfer (RAFT) polymerization. As-synthesized copolymer was characterized 1 H nuclear magnetic resonance ( 1 H NMR), gel permeation chromatography (GPC), Fourier transform infrared (FTIR). The copolymer precursors self-assembled in form of spherical micelles (in selective solvents) have been hydrolyzed and then condensed via sol-gel process in order to generate polyurethane-silica (PU-SiO2) hybrid materials. The hybrid copolymers thus prepared possess excellent thermal stability and mechanical property. The structures and properties of the copolymer precursors and their hybrid copolymers were characterized by thermogravimetric analysis (TGA), tensile test and atomic force microscopy (AFM). Vol.4, No.1 (2010) 17-25 Available online at www.expresspolymlett.com DOI: 10.3144/expresspolymlett.2010.4 sol-gel method, permits access to hybrid nanoballs through a very simple one-pot procedure. TPM with reactive trimethoxysilane groups is widely used in the preparation of organic-inorganic hybrid nanomaterials [15][16][17][18][19]. With a base catalyst, the R-Si(OCH 3 ) 3 groups can be easily hydrolyzed into R-Si(OH) 3 which can subsequently transform into cross-linked polysilsesquioxane nanocages by condensation, thus producing organic-inorganic hybrid nanoballs [7,20,21]. Recently, some research interests have sparked in the studies of self-assembly of copolymers based on poly [3-(trimethoxysilyl) propyl methacrylate] (PTPM). For example, Chen et al. reported the preparation and self-assembly behavior of novel organic-inorganic hybrid nanoparticles with a complex hollow structure based on a reactive amphiphilic diblock copolymer, poly(ethylene oxide)-b-poly [3-(trimethoxysilyl) propyl methacrylate] (PEO-b-PTPM) [22]. Polyurethanes (PU), as organic matrices, have received most attention for their versatile properties and a variety of starting materials. Therefore, the tailor-made properties of this class of materials can be obtained from well-designed combinations of monomeric materials, catalysts, auxiliary compounds. Polyurethanes can be tailored to meet the highly diversified demands of modern technologies such as coatings, adhesives, reaction injection molding, fibers, foams, rubbers, and thermoplastic elastomers. The linear structures of segmented PU take the form of (A-B) n . The soft segment part B represents the polyester or polyether macrogels with molecular weights ranging from 1000 to 3000; and the hard segment part A is consisted of lowmolecular weight diol or diamine being able to react with diisocyanate. Because of the incompatibility between the hard segments and the soft ones, PU undergoes microphase separation resulting in a hard-segment domain, soft-segment mat...

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Section: Introductionmentioning

confidence: 99%

Preparation and characterization of organic-inorganic hybrid nanomaterials using polyurethane-b-poly[3-(trimethoxysilyl) propyl methacrylate] via RAFT polymerization

Guo¹,

Zhang²,

Wang³

et al. 2010

Express Polym. Lett.

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“…The change implies the formation of the Si-O-Si networks involving the hydrolysis products of TEOS and MPS with the mutual linkage [31]. The absorption peaks of 812/cm and 790/cm which are assigned to methoxy groups rocking vibration [32] of MPS and Si-O 4 asymmetric stretching vibration [24,33] almost faded after hydrolysis. These results suggest the hydrolysis of the alkoxy groups of TEOS and MPS and the formation of MPS-modified silica sol.…”

Section: Synthesis and Morphology Of The Solmentioning

confidence: 99%

“…For instance, selecting the appropriate structure of the silane coupling agents and adjusting its dosage, or adding the substitution of solvents in the sol. In the study on preparation of UV-curable hybrid materials, c-methacryloxypropyltrimethoxysilane (MPS) is the most commonly used coupling agent due to its C=C group allows the inorganic phase to form a chemical bond with the organic phase [22][23][24][25][26][27]. It is also available to improve the stability of the concentrated sol because its long molecule chain is expected to hinder the collision of the colloidal particles.…”

Section: Introductionmentioning

confidence: 99%

Preparation and stability of silica sol/TPGDA dispersions and its application in the UV-curable hybrid coatings for fire protection

Shang

Hang

Jin

et al. 2013

J Sol-Gel Sci Technol

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A series of silica sols modified by c-methacryloxypropyltrimethoxysilane (MPS) were synthesized by the acid-catalyzed sol-gel method, and then the solvent in these sols were extracted under several vacuum distillation conditions. The stability of the sol after the distillation can be improved by means of increasing the dosage of MPS and incorporating reactive diluent TPGDA into the sol as new dispersion medium. Optimized samples have maintained stable for over 180 days. The sol dispersions and UV-curable organic compounds were mixed to form the hybrid coatings for fire protection. Effects of the distillation treatment and the cosolvent anhydrous ethanol added into the reaction solution on thermal and combustion performances and physical properties of the hybrid coatings were studied by thermogravimetric analysis, microscale combustion calorimeter, limit oxygen index test and UL-94 horizontal test, etc. The results showed that the distillation treatment for the sol was necessary to improve thermal performance and physical properties of the hybrid coatings. In addition, in the flammability experiment, hybrid coatings showed a quick and efficient protection of the substrate.

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“…Para la síntesis de recubrimientos vía sol-gel se dispone de precursores de recubrimientos inorgánicos e híbridos. Los precursores comúnmente utilizados para la síntesis de recubrimientos inorgánicos son los alcóxidos metálicos de tipo M(OR) n , siendo M un metal como Si, Ti, Zr, Al, Fe, B, entre otros, aunque normalmente suelen ser base silano (Si(OR) 4 ), por su reactividad moderada que hace más controlable el proceso de síntesis (Han et al, 2007;Wang y Bierwagen, 2009;Zheng y Li, 2010). Entre ellos aparece el tetraetoxisilano (Si(OEt) 4 , TEOS), convencionalmente utilizado en la síntesis de estructuras de sílice (SiO 2 ) para catalizadores, membranas y fármacos (Bonekamp et al, 2008).…”

Section: Introductionunclassified

Síntesis, caracterización y evaluación de la resistencia a la corrosión de recubrimientos híbridos Sol-Gel base TEOS/MPS sobre la aleación AA2050-T8

et al. 2017

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RESUMEN:El presente trabajo tuvo como objetivo sintetizar, caracterizar y evaluar la resistencia a la corrosión de recubrimientos híbridos sol-gel base TEOS/MPS, sintetizados sobre la aleación AA2050-T8 (Al-Cu-Li) bajo diferentes condiciones experimentales de polimerización, tales como solvente y tiempo de envejecimiento, así como diferentes relaciones molares de los precursores inorgánico tetraetoxisilano (TEOS) e híbrido 3-metacriloxipropiltrimetoxisilano (MPS). Se monitoreó la evolución de los soles durante el proceso de envejecimiento mediante espectroscopía infrarroja (FT-IR) y ensayos reológicos. Los recubrimientos se obtuvieron mediante dip-coating y fueron caracterizados a través de microscopía electrónica de barrido (MEB-EDX). La evaluación de la resistencia a la corrosión se realizó mediante ensayos de polarización anódica potenciodinámica, en solución aireada 0,1 M de NaCl. Los resultados obtenidos revelaron que, de los tres solventes evaluados, el etanol es el que permite mejor estabilización del precursor híbrido y favorece el proceso de polimerización de los grupos metacrilato del precursor MPS. Por otra parte, la variación de la relación molar TEOS:MPS conlleva a la obtención de recubrimientos más homogéneos y continuos al incrementar la relación del precursor inorgánico. Finalmente, todos los recubrimientos sintetizados mejoraron la resistencia a la corrosión de la aleación AA2050-T8, en especial los sintetizados bajo la relación TEOS:MPS 80:20. ABSTRACT: Synthesis, characterisation and corrosion resistance of TEOS/MPS hybrid sol-gel coatings deposited on the AA2050-T8 alloy. The aim of the present work was to synthesize, characterise and evaluate the corrosion resistance of TEOS/MPS hybrid sol-gel coatings applied on the AA2050-T8 aluminium alloy attending to two experimental variables: the sol synthesis conditions (type of solvent and aging time), and the inorganic/hybrid (TEOS/MPS) ratio. The aging process was monitored by infrared spectroscopy (FTIR) and viscosity measurements. The hybrid coatings were obtained by dip-coating and then characterized by scanning electron microscopy (SEM-EDX). The evaluation of corrosion resistance was performed by anodic potentio dynamic polarization testing in aerated 0.1 M NaCl solution. The results showed that ethanol as solvent promoted better stabilization of the hybrid precursor and favoured polymerization of the

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Sol–gel-derived organic–inorganic hybrid materials

Cited by 129 publications

References 30 publications

Preparation and characterization of organic-inorganic hybrid nanomaterials using polyurethane-b-poly[3-(trimethoxysilyl) propyl methacrylate] via RAFT polymerization

Preparation and characterization of organic-inorganic hybrid nanomaterials using polyurethane-b-poly[3-(trimethoxysilyl) propyl methacrylate] via RAFT polymerization

Preparation and stability of silica sol/TPGDA dispersions and its application in the UV-curable hybrid coatings for fire protection

Síntesis, caracterización y evaluación de la resistencia a la corrosión de recubrimientos híbridos Sol-Gel base TEOS/MPS sobre la aleación AA2050-T8

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