Organic–inorganic hybrids made from polymerizable precursors

Uricanu, V.I.; Donescu, Dan; Banu, A.G.; Şerban, S.; Olteanu, Mihaela; Dudau, Manuela

doi:10.1016/j.matchemphys.2003.12.024

Cited by 25 publications

(20 citation statements)

References 34 publications

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“…without polymers, were studied in the recent paper [15]. Those results are in good agreement with results presented in this paper.…”

Section: Hybrids Obtained With Tip and Triethoxysilane Derivatessupporting

confidence: 88%

“…In previous papers [14,15] it was shown that the alcohol-water mixture could form microemulsions with TEOS and monomers. Using TIP, the physical-chemistry analyses are not possible, due to fast hydrolysis reaction.…”

Section: Hybrids Obtained With Tip and Triethoxysilane Derivatesmentioning

confidence: 99%

“…It is well known that the presence of an inorganic network in hybrid materials increases the thermal stability [5,15,18]. Starting from these assumptions we studied the effect of the inorganic part vs. the thermal stability of final products (Figs.1,2,3).…”

Section: Hybrids Obtained With Tip and Triethoxysilane Derivatesmentioning

confidence: 99%

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Polymer-Titanium hybrids obtained by radical polymerization and Sol-Gel process

et al. 2005

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The possibility to prepare hybrids made by poly(vinyl acetate) (PVAc), poly(methyl methacrylate) (PMMA) and/or poly(ethyl acrylate) (PEtA) with TiO 2 was studied. The processes of polymer formation -radical polymerization and sol-gel process for inorganic network -were achieved simultaneously. Due to a high reactivity of titanium isopropoxide (TIP) in the sol-gel process, a complexant comonomer, allyl acetoacetate (AlAcAc), was used. Covalent bonds between polymer and inorganic chains were obtained by addition of trialkoxysilane derivates with vinyl (VTES) or methacryloyl (MPTS) groups. The presence of TIP inhibits the radical polymerization of vinyl acetate (VAc). The PVAc-TiO 2 hybrids were produced by the sol-gel process of TIP in the presence of pre-obtained PVAc. Except for VTES and MPTS, trialkoxysilane derivates with methyl (MeTES), octyl (OTES) and phenyl (PTES) groups were used. The thermal stability of hybrids is strongly affected by TiO 2 presence and by the type of trialkoxysilane derivates. The thermal stability of PVAc hybrids decreases in the presence of TiO 2 inorganic network. The glass transition temperature of polymers increases in the presence of the inorganic network.

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“…without polymers, were studied in the recent paper [15]. Those results are in good agreement with results presented in this paper.…”

Section: Hybrids Obtained With Tip and Triethoxysilane Derivatessupporting

confidence: 88%

Section: Hybrids Obtained With Tip and Triethoxysilane Derivatesmentioning

confidence: 99%

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Polymer-Titanium hybrids obtained by radical polymerization and Sol-Gel process

et al. 2005

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“…AFM imaging technique can provide a representative analysis covering individual micronsized particles, such as the diameter and height of particles, surface roughness, etc. [37]. Therefore, the particles that protrude from the polyurethane sample surface may be imaged by using AFM.…”

mentioning

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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“…As in our previous works, 22,23 we used different alkoxysilanes, with or without the addition of a titanium-compound.…”

Section: Introductionmentioning

confidence: 99%

Filmogen organic–inorganic hybrids obtained by sol–gel in the presence of cationic polymer

Donescu

Şerban

Uricanu

et al. 2007

J of Applied Polymer Sci

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Self-standing and coated-on-glass films were prepared from polymer-inorganic ormosils, using the cationic polymer poly(methacrylamide propyl quaternarydimethyldodecyl bromide). The inorganic compound was grown in sol-gel reactions based on methyltriethoxysilane (MeTES), with or without addition of the titanium-precursor: tetraisopropyl orthotitanate. As evidenced by thermogravimetric analysis and differential scanning calorimetry data, the thermal properties of the films are highly dependent on the internal morphology. Inorganic granules with a TiO 2 rich shell have a more polar surface, which stimulates stronger electrostatic interactions with the polymer, hence, a reduced mobility for the amino end and a smaller probability to have amino ends engaged in interactions at the surface of the granules. Coated-on-glass films drawn from pure cationic polymer suffer from partial dewetting. Topographic and force-versus-distance recordings using atomic force microscopy showed a change in the energy balance and no dewetting regions were encountered for polymer/MeTES based composites. However, because of nongrafted polymer, these films are not immune at washing with water/ acetone. Explorations of antibacterial activity against the gram-negative bacteria, Pseudomonas aeruginosa, were done using ormosil films with alkoxysilanes combinations.

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Organic–inorganic hybrids made from polymerizable precursors

Cited by 25 publications

References 34 publications

Polymer-Titanium hybrids obtained by radical polymerization and Sol-Gel process

Polymer-Titanium hybrids obtained by radical polymerization and Sol-Gel process

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

Filmogen organic–inorganic hybrids obtained by sol–gel in the presence of cationic polymer

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