New Routes to Multicomponent Oxide Glasses

Dislich, Helmut

doi:10.1002/anie.197103631

Cited by 357 publications

(92 citation statements)

References 12 publications

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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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“…Wet processes, such as the sol−gel method, are useful methods to prepare inorganic thin films containing organic compounds because they easily form nanocrystalline materials [9][10][11][12][13]. In the sol−gel matrices, the dye molecules having a high photofunction can be encapsulated in the small pores of the inorganic matrices [14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Interaction between dye and zinc in the dye-dispersing ZnO films prepared by a wet process

et al. 2014

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Dye-dispersing ZnO precursor gel films were prepared on indium tin oxide electrodes from a zinc acetate solution containing eosin Y by dip-coating, steam treatment, and then heating at a low temperature. The electronic interaction between the dye and zinc in the dye-dispersing gel films were investigated by spectroscopic and electrochemical measurements. A photocurrent was observed in the dye-dispersing gel electrodes before the steam treatment. The photocurrent value increased by the steam treatment and heating due to crystallization of the gel and removal of organic impurities. The dye molecules existed between the interlayers of the layered zinc hydroxide coexisting with the ZnO. The photoexcited electron in the dye should be injected into the ZnO conduction band via the layered zinc hydroxide. The value increased with an increase in the dye content even though the ZnO crystallinity decreased.The dye-zinc interaction, i.e., the complex formation and photoinduced electron injection, played an important role in the electron transport and photoelectric conversion.

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“…The technique of sol-gel process depends on two steps: hydrolysis and condensation reactions. The mechanisms of hydrolysis and condensation, and the factors (organic radical of the OR-group, solvent, catalyst, concentration and temperature) that have a bias toward linear or branched structures are the most critical issues of sol-gel science and technology (Dislich, 1971;Matijevic, 1986;Brinker & Mukherjee, 1981;Sakka & Kamiya, 1980;Yoldas, 1979;Prochazka & Klug, 1983;Ikesue et al, 1995;Ikesue, 2002).…”

Section: Introductionmentioning

confidence: 99%

Part I: Characterization of Flammability Behavior of Polyester Fabric Modified with Sol-Gel

Younis¹,

Elnagar²,

Nour³

2013

IJC

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Polyester (PET) fabric is insecure to use since it melts at 249-290 °C, such molten PET could drip on underlying surfaces or human skin and hence becomes harmful. The rapidly ignited and flammable materials found in nearby areas might lead to damage life and property of consumers. In this research, the fabric was modified to avoid these disadvantages. Thus we investigate the effect of phosphorylated sol-gel coating material on UV/Ozone pre-modified polyester sample for different periods. The thermogravimetric analysis (TGA) and ignition properties (UL/94) were studied for all samples under test. The samples with phosphorylated sol-gel material improved the flammability behavior. Also, the use of UV/Ozone prior this modification activate the surface of polyester, thus improved the stability of the flame retardant.

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New Routes to Multicomponent Oxide Glasses

Cited by 357 publications

References 12 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

Interaction between dye and zinc in the dye-dispersing ZnO films prepared by a wet process

Part I: Characterization of Flammability Behavior of Polyester Fabric Modified with Sol-Gel

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