Improved Hardness of Nanocomposite Films on PMMA Sheet Using Beadmilled-SiO2 Nanoparticle in Dowanol PM

The main objective of this study was to prepare bead milled-silica nanoparticles (SiO2) as reinforcing materials for transparent hard coating films. SiO2 dispersed in Dowanol PM without any stabilizer was used as a main component in the nanocomposite hard coating films to improve hardness of Poly methyl methacrylate (PMMA) sheets. However, the major challenge in hard coating formulation is the dispersion of nanoscale SiO2 particles. Bead milling machine (MiniCer, NETZSCH, Germany) equipped with different sizes of zirconia (ZrO2) beads (0.1, 0.5, and 1.0 mm) was used for dispersing 40wt% SiO2 in Dowanol PM to achieve target sizes of 200, 500, and 800 nm. The dispersed nanoparticles were characterized by UV-visible spectroscopy for their optical transmission, transmission electron microscopy (TEM) for particle morphologies, and dynamic light scattering technique (DLS) for the particles sizes. The milled-SiO2 nanoparticles were stable in Dowanol PM as suspensions with their particles sizes closed to the target sizes. The 200-nm suspension showed the longest storage time without any aggregate formation. Whereas, the dispersed nanoparticles suspensions with the particles size >500 nm formed agglomerates during storage. The SiO2/MTMS nanocomposite coating film was then prepared coated milled-SiO2 suspension in Dowanol PM on PMMA sheets. The film with 200 nm SiO2 showed the highest transparency (92% at 550 nm) which was like the uncoated PMMA sheets. At thickness of 3-microns, SiO2/MTMS nanocomposite films could improve pencil hardness of PMMA sheets from <H to 3H.

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Waterborne epoxy-modified polyurethane-acrylate dispersions with nano-sized core-shell structure particles: synthesis, characterization, and their coating film properties

Journal of Polymer Engineering ◽

10.1515/polyeng-2016-0003 ◽

2017 ◽

Vol 37 (2) ◽

pp. 113-123 ◽

Cited By ~ 6

Author(s):

Jing Sun ◽

Huagao Fang ◽

Haili Wang ◽

Shanzhong Yang ◽

Shengrong Xiao ◽

...

Keyword(s):

Shell Structure ◽

Core Shell ◽

Coating Film ◽

Coating Films ◽

Polyurethane Acrylate ◽

Transmission Electron ◽

Step Procedure ◽

Waterborne Epoxy ◽

Core Shell Structure ◽

Thermo Stability

Abstract Waterborne epoxy-modified polyurethane-acrylate (EPUA) dispersions with nano-sized core-shell structure particles, with polyacrylate (PA) as core and epoxy-modified polyurethane (EPU) as shell, were successfully prepared via a two-step procedure. The waterborne EPU dispersions were first synthesized to serve as seeds, and then the butyl acrylate (BA) and methyl methacrylate (MMA) monomers were introduced into EPU particles to form polymeric core by radical polymerization under the assistance of ultrasonic treatment. Fourier transform infrared (FT-IR) spectroscopy revealed that the epoxy and PA components were successfully incorporated onto the chain of the PU and EPU to form EPU and EPUA, respectively. The transmission electron microscopy (TEM) photograph demonstrated that the EPUA particles have the core-shell structure. The as-prepared EPUA coating films exhibited good thermo-stability and mechanical properties, as revealed by thermogravimetric analysis (TGA) and tensile testing, respectively. The results of potentiodynamic polarization curves and immersion corrosion testing in 5 wt% NaCl aqueous solution both demonstrated that the anticorrosive properties of EPUA mainly depended on the mass content of PA, with the optimized value of 30 wt%.

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Nanocomposite synthesis by thermolysis of [Ag(hfac)(COD)] in amorphous polystyrene

Science and Engineering of Composite Materials ◽

10.1515/secm-2011-0125 ◽

2012 ◽

Vol 19 (2) ◽

pp. 195-197 ◽

Cited By ~ 4

Author(s):

Gianfranco Carotenuto ◽

Mariano Palomba ◽

Luigi Nicolais

Keyword(s):

Polymer Matrix ◽

Nanocomposite Films ◽

Numerical Density ◽

Silver Particles ◽

X Ray ◽

Transmission Electron ◽

Vis Spectroscopy ◽

Yellow Coloration ◽

Color Filters ◽

Silver Atoms

AbstractLightfast color filters (intensively and brightly colored) can be easily produced by dying optical plastics with the surface plasmon resonance (SPR) of metal nanoparticles such as silver and gold. Here, color filters based on silver nanoparticles embedded in amorphous polystyrene have been prepared by dissolving and thermally decomposing (1,5-cyclooctadiene)(hexafluoro-acetylacetonate)silver(I) in amorphous polystyrene. The metal precursor quickly decomposes (10 s, at 180°C), leading to silver atoms that clusterize and produce a non-aggregated dispersion of silver particles in the polymer matrix. The intensity of the yellow coloration due to the SPR of nanoscopic silver can be widely tuned simply by varying the cluster numerical density in the polymer matrix that depends on the silver precursor concentration. The obtained nanocomposite films have been characterized by X-ray power diffraction, transmission electron microscopy, and UV-Vis spectroscopy.

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Preparation of Poly(Lactic Acid) Acrylate for UV-Curable Coating Applications

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.659.570 ◽

2015 ◽

Vol 659 ◽

pp. 570-574 ◽

Cited By ~ 2

Author(s):

Apinya Musidang ◽

Nantana Jiratumnukul

Keyword(s):

Lactic Acid ◽

Physical Properties ◽

High Efficiency ◽

Low Energy ◽

Poly Lactic Acid ◽

Coating Film ◽

Pencil Hardness ◽

Uv Curable ◽

Low Energy Consumption ◽

Volatile Organic

UV-curable process is widely used for paints, inks and adhesives due to its rapid curing, low energy consumption, high efficiency and low volatile organic compounds (VOCs). The objective of this research is to prepare poly(lactic acid) (PLA) based UV-curable coating by using glycolyzed PLA. PLA was glycolyzed by ethylene glycol (EG) at 170°C for 90 minutes. The obtained glycolyzed PLA was reacted with methacrylic anhydride (MAAH) to provide PLA acrylate oligomer. The obtained PLA acrylate oligomer was used in coating formulations with various amounts of photoinitiator and cured under UV radiation. Physical properties of cured coating film were investigated such as pencil hardness, gloss and haze. The results showed that poly(lactic acid) (PLA) based UV-curable coating provided good physical properties.

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Investigation of reinforced performance of modified graphene oxide/high solid content polysiloxane nanocomposite coating films

Journal of Materials Science ◽

10.1007/s10853-018-3077-7 ◽

2018 ◽

Vol 54 (4) ◽

pp. 3052-3068 ◽

Cited By ~ 2

Author(s):

Xinhai Zhang ◽

Xiaohong Ying ◽

Mengmeng Zhang ◽

Xufeng Yu ◽

Gang Sun ◽

...

Keyword(s):

Graphene Oxide ◽

Nanocomposite Coating ◽

Solid Content ◽

High Solid Content ◽

Coating Films ◽

High Solid ◽

Modified Graphene Oxide ◽

Modified Graphene

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Preparation of Cellulose-Based Fluorescent Materials as Coating Pigment by Use of DMSO/DBU/CO2 System

10.21203/rs.3.rs-577076/v1 ◽

2021 ◽

Author(s):

Qinghua Cao ◽

Jinyue Dai ◽

Xin Bao ◽

Zhenyu Zhang ◽

Fei Liu ◽

...

Keyword(s):

Uv Light ◽

Tensile Modulus ◽

Coating Film ◽

Coating Films ◽

Fluorescence Response ◽

Mild Conditions ◽

Fluorescent Materials ◽

Bright Color ◽

Molecular Skeleton ◽

Quenching Phenomenon

Abstract A series of cellulose-based fluorescent materials are prepared under relative mild conditions by use of the DMSO/DBU/CO2 system to utilize as coating pigments. Through the observation under 365nm UV light, the cellulose-based fluorescent materials exhibit good fluorescence response and bright color. Furthermore, due to the limitation of the molecular skeleton of cellulose, the intrinsic aggregation caused quenching phenomenon commonly existed in conventional organic fluorescent pigments can be effectively inhibited, which is very helpful to retain good fluorescence response in epoxy-based coating material and its coating films. Moreover, the addition of cellulose-based fluorescent materials also increases the mechanical properties of the coating film. The increase of tensile strength and tensile modulus respectively reaches ~39% and ~66%. Solvent resistance and thermal property of the coating films generally remain unchanged. The fabrication of cellulose-based fluorescent materials in DMSO/DBU/CO2 system provides a feasible way to develop the functional application of cellulose.

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A Study on the Annealing Ambient Effect on the Anti-Pollution Characteristics of Functional Film for PV Modules

Applied Sciences ◽

10.3390/app8112285 ◽

2018 ◽

Vol 8 (11) ◽

pp. 2285

Author(s):

Sejin Jung ◽

Jung Kim ◽

Jang Ko ◽

Wonseok Choi

Keyword(s):

Contact Angle ◽

Mechanical Characteristics ◽

Spray Coating ◽

Light Transmittance ◽

Process Conditions ◽

Coating Film ◽

Coating Films ◽

Functional Coating ◽

Pollution Characteristics ◽

Pv Modules

In this study, functional coating film was fabricated on glass for photovoltaic (PV) modules to improve the anti-pollution characteristics of PV modules. The functional coating film applied to a glass substrate through the spray coating method was annealed at 300 °C for 10 min in H2, N2, Ar, O2, and vacuum ambient. The contact angle of the coated surface was measured and it was confirmed that the anti-pollution characteristics were improved as the contact angle decreased. The light transmittance was measured and it exhibited the most excellent characteristics in vacuum. The hardness and adhesion were measured as the mechanical characteristics and they were all excellent regardless of the annealing ambient. Based on the analyzed characteristics, the process conditions of functional coating films were optimized to improve the anti-pollution and mechanical characteristics. If the coating process optimized in this study is applied to PV modules based on these results, improvement in the anti-pollution characteristics can be expected.

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Radiation – induced preparation of polyaniline/poly vinyl alcohol nanocomposites and their properties

Radiochimica Acta ◽

10.1515/ract-2018-3003 ◽

2019 ◽

Vol 107 (8) ◽

pp. 725-735

Author(s):

Hoda H. Saleh ◽

Rehab Sokary ◽

Zakaria I. Ali

Keyword(s):

Electron Microscopy ◽

Scanning Electron Microscopy ◽

Transmission Electron Microscopy ◽

High Resolution ◽

Vinyl Alcohol ◽

Oxidative Polymerization ◽

Nanocomposite Films ◽

Poly Vinyl Alcohol ◽

Transmission Electron ◽

Scanning Electron

Abstract Polyaniline (PANI) nanoparticles and PANI/poly vinyl alcohol (PVA) nanocomposite films were synthesized by the oxidative polymerization of aniline and ammonium peroxodisulfate (APS), as an oxidizing agent in aqueous medium. The PANI/PVA nanocomposite films were exposed to γ-irradiation after oxidative polymerization. Synthesized polyaniline (PANI) nanoparticles and PANI/PVA nanocomposite films were characterized by attenuated total reflectance infrared spectroscopy (FTIR-ATR), X-ray diffraction, high resolution scanning electron microscopy, (HRSEM) high resolution transmission electron microscopy, (HRTEM) and UV-VIS absorption spectroscopy. Energy band gap of PANI nanofibers was determined from Tauc’s plots which equal 4.2 eV. Scanning electron microscopy images show that chemically synthesized of polyaniline has nanofibers structure and irradiated PANI/PVA nanocomposite have a mixture of nanorod and nanosphere structures. The transmission electron microscopy show that chemically synthesized of polyaniline has average length in the range 34 ± 10 nm with less wide distribution, where as the irradiated PANI/PVA nanocomposite has coreshell structure.

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