Bi-hybrid coatings: polyaniline-montmorillonite filler in organic-inorganic polymer matrix

2013 ◽  
Vol 67 (8) ◽  
Author(s):  
Milena Špírková ◽  
Patrycja Bober ◽  
Jiří Kotek ◽  
Jaroslav Stejskal
Keyword(s):  
Polymer Matrix ◽  
Propylene Oxide ◽  
Sol Gel ◽  
Reaction System ◽  
Tensile Tests ◽  
Polymeric Matrix ◽  
Inorganic Polymer ◽  
Hybrid Coatings ◽  
Surface Modified

AbstractA bi-hybrid composite is represented by an organic-inorganic (O-I) filler dispersed in an O-I matrix. Polyaniline-montmorillonite, as a nanocomposite filler, was synthesised by two independent processes: (1) montmorillonite was surface-modified with a conducting polymer, polyaniline, during the in-situ oxidation of aniline or (2) montmorillonite was pre-treated with aniline, then the aniline was polymerised and the polyaniline subsequently produced penetrated the montmorillonite structure. The organic-inorganic polymer matrix was formed in two independent steps: (1) inorganic building units were formed in situ by the sol-gel process, (2) followed by organic polymeric matrix formation by polyaddition reactions of epoxy groups with amines. Polyaniline-montmorillonite filler was added to the reaction system between these two steps, i.e. when the inorganic structures of the O-I matrix have already been formed but prior to formation of the organic polymeric matrix. Two different O-I matrices were prepared from functionalised organosilicon precursors and oligomeric amines. 3-[(Glycidyloxy)propyl]trimethoxysilane reacted with α,ω-oligo(propylene oxide) diamine and diethoxy[3-(glycidyloxy)propyl]-methylsilane reacted with α,ω-oligo(propylene oxide) triamine. The resulting bi-hybrid coatings, the O-I filler dispersed in the O-I matrix, were characterised by atomic-force and optical microscopies, and also by tensile tests. The filler composition affected both the mechanical and surface properties of the coatings.

Antibacterial Activity of Surface-Modified Fabric with Ag/AgCl-Doped Quaternary Ammonium-Modified Silicate Hybrid

2019 ◽  
Vol 19 (11) ◽  
pp. 7285-7293 ◽  
Author(s):  
Kuo-Hui Wu ◽  
Yin-Chiung Chang ◽  
Ken-Fa Cheng ◽  
Je-Chuang Wang
Keyword(s):  
Colloidal Suspension ◽  
Sol Gel ◽  
Antimicrobial Properties ◽  
Woven Fabrics ◽  
Dipolar Interactions ◽  
Zone Of Inhibition ◽  
E Coli ◽  
Antibacterial Material ◽  
Surface Modified

An organic–inorganic hybrid antibacterial material based on Ag/AgCl and quaternary ammoniummodified silicate (Ormosil (NR+4 Cl-)) was prepared by sol–gel processes and an in situ reduction method, in which silver nitrate, tetraethoxysilane (TEOS), N-trimethoxysilylpropyl-N,N,Ntrimethylammonium chloride (TMAPS) and N-[3-(trimethoxysilyl)propyl]diethylenetriamine (ATS) acted as precursor, linker and colloidal suspension stabilizer, respectively. The physical properties of the Ormosil (NR+4 Cl-) and Ormosil (NR+4 Cl-)/Ag hybrids were examined using XPS and TGA spectroscopy, the results of which indicated that Ag/AgCl was immobilized in channels by dipolar interactions with the Ormosil (NR+4 Cl-) matrix. Ormosil (NR+4 Cl-) and Ormosil (NR+4 Cl-)/Ag sol solutions were used to functionalize non-woven fabrics by simply immersing the textiles into the dispersions in order to obtain antimicrobial fabrics. The antibacterial effects of the Ormosil/Ag- and Ormosil (NR+4 Cl-)/Ag-modified fabrics against Gram-negative P. aeruginosa and E. coli, and Grampositive S. aureus and B. subtilis, were assessed using the zone of inhibition and the plate-counting method. The antibacterial efficacy was maintained even after 20 laundry cycles. The results indicated that the Ormosil/Ag and Ormosil (NR+4 Cl-)/Ag hybrids are useful as non-leaching agents imparting durable antimicrobial properties to fabrics.

UV-curable fluorine-containing hybrid coatings via thiol-ene “click” reaction and an in situ sol–gel method

2012 ◽  
Vol 70 (3) ◽  
pp. 1037-1048 ◽  
Author(s):  
Emrah Çakmakçı ◽  
Yusuf Mülazim ◽  
Memet Vezir Kahraman
Keyword(s):  
Click Reaction ◽  
Sol Gel ◽  
Hybrid Coatings ◽  
Uv Curable ◽  
Gel Method ◽  
Sol Gel Method

scholarly journals Influence of Hybrid Sol-Gel Crosslinker on Self-Healing Properties for Multifunctional Coatings

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5382
Author(s):  
Guillaume Lollivier ◽  
Marie Gressier ◽  
Florence Ansart ◽  
Maëlenn Aufray ◽  
Marie-Joëlle Menu
Keyword(s):  
Sol Gel ◽  
Interface Layer ◽  
Hybrid Coatings ◽  
Organic Polymer ◽  
Self Healing ◽  
Oxide Interface ◽  
Protective Oxide ◽  
New Class ◽  
One Step

Self-healing polymers are a new class of material that has recently received a lot of attention because of the lifespan improvement it could bring to multiple applications. One of the major challenges is to obtain multifunctional materials which can self-heal and exhibit other interesting properties such as protection against corrosion. In this paper, the effect of the incorporation of an aminosilane on the properties of a self-healing organic polymer containing disulfide bond is studied on films and coatings for aluminium AA2024-T3 using simple one step in situ synthesis. Hybrid coatings with enhanced anticorrosion properties measured by EIS were obtained thanks to the formation of a protective oxide interface layer, while exhibiting wound closure after exposition at 75 °C. The thermal, mechanical and rheological properties of the films with different aminosilane amounts were characterized in order to understand the influence of the slight presence of the inorganic network. Stiffer and reprocessable hybrid films were obtained, capable to recover their mechanical properties after healing. The nanocomposite structure, confirmed by TEM, had a positive effect on the self-healing and stress relaxation properties. These results highlight the potential of sol-gel chemistry to obtain efficient anticorrosion and self-healing coatings.

scholarly journals In Situ Synthesis of Hybrid Inorganic-Polymer Nanocomposites

2018 ◽  
Author(s):  
Mohammed Adnan ◽  
Antoine Dalod ◽  
Mustafa Balci ◽  
Julia Glaum ◽  
Mari-Ann Einarsrud
Keyword(s):  
Polymer Nanocomposites ◽  
Sol Gel ◽  
Inorganic Nanoparticles ◽  
Inorganic Polymer ◽  
Ex Situ ◽  
Synthesis Methods ◽  
Inorganic Oxide ◽  
Synthesis Conditions ◽  
In Situ Techniques

Hybrid inorganic-polymer nanocomposites can be employed in diverse applications due to the potential combination of desired properties from both the organic and inorganic components. The use of novel bottom-up in situ synthesis methods for the fabrication of these nanocomposites is advantageous compared to top-down ex situ mixing methods, as it offers increased control over the structure and properties of the material. In this review, the focus will be on the application of the sol-gel process for the synthesis of inorganic oxide nanoparticles in epoxy and polysiloxane matrices. The effect of the synthesis conditions and the reactants used on the inorganic structures formed, the interactions between the polymer chains and the inorganic nanoparticles, and the resulting properties of the nanocomposites are appraised from several studies over the last two decades. Lastly, alternative in situ techniques and the applications of various polymer-inorganic oxide nanocomposites are briefly discussed.

Polyamide grafted with polypyrrole: formation, properties, and stability

2013 ◽  
Vol 67 (8) ◽  
Author(s):  
Katarína Mosnáčková ◽  
Mohamed Chehimi ◽  
Pavol Fedorko ◽  
Mária Omastová
Keyword(s):  
Photoelectron Spectroscopy ◽  
Surface Composition ◽  
Sol Gel ◽  
Attenuated Total Reflectance ◽  
Conducting Layer ◽  
Washing Process ◽  
Sol Gel Process ◽  
Pre Treatment ◽  
Surface Modified

AbstractConducting textiles of polyamide (PA) fabrics and polypyrrole (PPy) were prepared by in situ oxidative chemical polymerisation of pyrrole (Py) on the surface of PA textiles using FeCl3 as oxidant. The anionic surfactant, dodecylbenzenesulphonic acid, was used as co-dopant during Py polymerisation on the textile surface. The influence of the monomer amount and polymerisation conditions on formation of the conducting PPy layer, conductivity, morphology, and stability of the prepared PA/PPy was studied. The conductivity of modified textiles decreased rapidly after the washing process, so a special Py-functionalised silane (1-(3-(triethoxysilyl)propylamino)-3-(1-H-pyrrole-1-yl)propan-2-ol; SP) was synthesised and applied to the PA surface prior to PPy formation. The presence of SP on the PA surface after completion of the sol-gel process was verified by Fourier transform infrared spectroscopy with an attenuated total reflectance. Pyrrole polymerisation was subsequently applied to the SP pre-treated textile surface. The influence of SP concentration on both the fastness of the conducting layer after the washing process and stability of the electrical conductivity of the prepared PA/PPy samples was investigated. Surface conductivity of the samples treated and untreated by the sol-gel process of SP was measured both prior to and after washing of the prepared textiles. It was found that an application of 0.6 mass % of SP significantly improved the fastness of the PPy layers. Examination of the modified PA surface using scanning electron microscopy disclosed the differences in the formation of PPy on PA textiles when using SP and also showed differences on the PPy modified textile surface prior to and after washing. The method of X-ray photoelectron spectroscopy was used for a detailed study of the surface composition. It was confirmed that the pre-treatment with Py-functionalised triethoxysilane significantly influenced the chemical composition of the PA surface modified with PPy.

scholarly journals Hybrid Sol–Gel Superhydrophobic Coatings Based on Alkyl Silane-Modified Nanosilica

Polymers ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 539
Author(s):  
Dafna Heiman-Burstein ◽  
Anna Dotan ◽  
Hanna Dodiuk ◽  
Samuel Kenig
Keyword(s):  
Contact Angle ◽  
Sol Gel ◽  
Alkyl Substituent ◽  
Hybrid Coatings ◽  
Sliding Angle ◽  
Random Surface ◽  
Water Contact ◽  
Superhydrophobic Coatings ◽  
Long Chain

Hybrid sol–gel superhydrophobic coatings based on alkyl silane-modified nanosilica were synthesized and studied. The hybrid coatings were synthesized using the classic Stöber process for producing hydrophilic silica nanoparticles (NPs) modified by the in-situ addition of long-chain alkyl silanes co-precursors in addition to the common tetraethyl orthosilicate (TEOS). It was demonstrated that the long-chain alkyl substituent silane induced a steric hindrance effect, slowing the alkylsilane self-condensation and allowing for the condensation of the TEOS to produce the silica NPs. Hence, following the formation of the silica NPs the alkylsilane reacted with the silica’s hydroxyls to yield hybrid alkyl-modified silica NPs having superhydrophobic (SH) attributes. The resulting SH coatings were characterized by contact angle goniometry, demonstrating a more than 150° water contact angle, a water sliding angle of less than 5°, and a transmittance of more than 90%. Confocal microscopy was used to analyze the micro random surface morphology of the SH surface and to indicate the parameters related to superhydrophobicity. It was found that a SH coating could be obtained when the alkyl length exceeded ten carbons, exhibiting a raspberry-like hierarchical morphology.

Characterization of Polystyrene Nanocomposites Containing Nanoparticles of Pseudoboehmite Obtained by Sol-Gel Process

2017 ◽  
Vol 47 ◽  
pp. 96-105 ◽  
Author(s):  
Leila Figueiredo de Miranda ◽  
Leid Jeane Pastrolin Goulart ◽  
Leonardo G. de Andrade e Silva ◽  
Alexandre Crioruska Donadon ◽  
Fabio Yuji Yamasaki ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Polymer Matrix ◽  
Tensile Elongation ◽  
Sol Gel ◽  
Polymeric Matrix ◽  
Lower Amount ◽  
Gravimetric Analysis ◽  
Inorganic Substances ◽  
Sol Gel Process

Polymeric nanocomposites are hybrid materials in which inorganic substances of nanometric dimensions are dispersed in a polymeric matrix. These inorganic substances have high surface area allowing a better interaction with the polymeric matrix and consequently promote changes in the physical properties of the final composite with small additions of the same. The preparation of nanocomposites with polymer matrix allows in many cases to find a relationship between a low cost due to the use of lower amount of charge, reaching high level of performance. In this work, it was obtained polystyrene nanocomposites with pseudoboehmite synthesized by the sol-gel process with different concentrations of pseudoboehmite using and not using octadecylamine as a coupling agent. The nanocomposites were prepared by the melt intercalation technique. The pseudoboehmite nanoparticles were characterized by X-ray diffraction, scanning electron microscopy, differential thermal analysis and thermo gravimetric analysis. The nanocomposites were characterized by differential thermal analysis, thermogravimetric analysis, heat deflection temperature, Vicat softening point, mechanical and rheological tests. The results showed an increase in the thermal properties, hardness and tensile strength values and decrease in the melt index, impact resistance and tensile elongation, showing the interaction of the filler with the polymer matrix. Although in the samples with the presence of octadecylamine the data shows that the thermomechanical properties practically do not vary in relation with the samples without octadecylamine.

An electrochemical study of corrosion protection by in situ oxidative polymerization in phenylenediamine crosslinked sol–gel hybrid coatings

2011 ◽  
Vol 56 (23) ◽  
pp. 7796-7804 ◽  
Author(s):  
Kenneth J. Croes ◽  
Andrew J. Vreugdenhil ◽  
Maocheng Yan ◽  
Thomas A. Singleton ◽  
Samuel Boraas ◽  
...  
Keyword(s):  
Corrosion Protection ◽  
Oxidative Polymerization ◽  
Sol Gel ◽  
Electrochemical Study ◽  
Hybrid Coatings

scholarly journals In Situ Synthesis of Hybrid Inorganic–Polymer Nanocomposites

Polymers ◽  
2018 ◽  
Vol 10 (10) ◽  
pp. 1129 ◽  
Author(s):  
Mohammed Adnan ◽  
Antoine Dalod ◽  
Mustafa Balci ◽  
Julia Glaum ◽  
Mari-Ann Einarsrud
Keyword(s):  
Polymer Nanocomposites ◽  
Sol Gel ◽  
In Situ Synthesis ◽  
Inorganic Nanoparticles ◽  
Inorganic Polymer ◽  
Ex Situ ◽  
Synthesis Methods ◽  
Inorganic Oxide ◽  
Synthesis Conditions

Hybrid inorganic–polymer nanocomposites can be employed in diverse applications due to the potential combination of desired properties from both the organic and inorganic components. The use of novel bottom–up in situ synthesis methods for the fabrication of these nanocomposites is advantageous compared to top–down ex situ mixing methods, as it offers increased control over the structure and properties of the material. In this review, the focus will be on the application of the sol–gel process for the synthesis of inorganic oxide nanoparticles in epoxy and polysiloxane matrices. The effect of the synthesis conditions and the reactants used on the inorganic structures formed, the interactions between the polymer chains and the inorganic nanoparticles, and the resulting properties of the nanocomposites are appraised from several studies over the last two decades. Lastly, alternative in situ techniques and the applications of various polymer–inorganic oxide nanocomposites are briefly discussed.

In-Situ Study of NiO Growth on Textured Nickel Tape Using Environmental Scanning Electron Microscope (ESEM) and Hot Stage

2001 ◽  
Vol 7 (S2) ◽  
pp. 1276-1277
Author(s):  
Y. Akin ◽  
R.E. Goddard ◽  
W. Sigmund ◽  
Y.S. Hascicek
Keyword(s):  
Buffer Layer ◽  
Lattice Mismatch ◽  
Sol Gel ◽  
Surface Oxidation ◽  
Dip Coating ◽  
Buffer Layers ◽  
Superconducting Film ◽  
Environmental Scanning ◽  
Cold Rolling And Annealing

Deposition of highly textured ReBa2Cu3O7−δ (RBCO) films on metallic substrates requires a buffer layer to prevent chemical reactions, reduce lattice mismatch between metallic substrate and superconducting film layer, and to prevent diffusion of metal atoms into the superconductor film. Nickel tapes are bi-axially textured by cold rolling and annealing at appropriate temperature (RABiTS) for epitaxial growth of YBa2Cu3O7−δ (YBCO) films. As buffer layers, several oxide thin films and then YBCO were coated on bi-axially textured nickel tapes by dip coating sol-gel process. Biaxially oriented NiO on the cube-textured nickel tape by a process named Surface-Oxidation- Epitaxy (SEO) has been introduced as an alternative buffer layer. in this work we have studied in situ growth of nickel oxide by ESEM and hot stage.Representative cold rolled nickel tape (99.999%) was annealed in an electric furnace under 4% hydrogen-96% argon gas mixture at 1050°C to get bi-axially textured nickel tape.

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