In-situ design, characterization and use of durable superhydrophobic thin coatings applied on polymeric films

2022 ◽  
Vol 146 ◽  
pp. 111598
Author(s):  
Naftali Kanovsky ◽  
Sarit Cohen ◽  
Shlomo Margel
Keyword(s):  
Polymeric Films ◽  
Thin Coatings

scholarly journals Bio-based polyurethane nanocomposite thin coatings from two comparable POSS with eight same vertex groups for controlled release urea

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Lixia Li ◽  
Meng Wang ◽  
Xiandong Wu ◽  
Wenping Yi ◽  
Qiang Xiao
Keyword(s):  
In Situ Polymerization ◽  
Polyhedral Oligomeric Silsesquioxanes ◽  
Poly Ethylene Glycol ◽  
Thin Coatings ◽  
Polyurethane Coatings ◽  
Coated Urea ◽  
Poly Ethylene ◽  
Coated Fertilizer ◽  
Polyurethane Matrix

AbstractNanocomposite modification has attracted much attention in improving properties of bio-based polymer coating material for coated fertilizer. Herein two comparable polyhedral oligomeric silsesquioxanes (POSS), with eight poly(ethylene glycol) (PEG) and octaphenyl groups attached to the cage, respectively, were successfully incorporated into thin castor oil-based polyurethane coatings via in-situ polymerization on the urea surface. The nanostructure coatings are environmentally friendly, easy to prepare, and property-tunable. The results show that the vertex group of POSS had a pronounced influence on dispersion level and interaction between polyurethane and POSS that well-tuned the release pattern and period of coated urea, even at the coating rate as low as of 2 wt%. The liquid POSS with long and flexible PEG groups had better compatibility and dispersibility in polyurethane matrix than the solid POSS with rigid octaphenyl groups, as evidenced by SEM/EDS. The unique properties were resulted from the different extents of physical crosslinkings. This modification of bio-based polyurethane coating with POSS provided an alternative method of regulating and controlling the properties of coated fertilizer.

Mechanical Properties of Pyrolytic "SiOCN" Thin Coatings

1993 ◽  
Vol 308 ◽  
Author(s):  
Sandrine Bec ◽  
André Tonck ◽  
Jean-Luc Loubet
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Ceramic Coatings ◽  
Optical Observation ◽  
Thin Coatings ◽  
Polymer Precursors ◽  
Polymeric State

ABSTRACTPyrolysis of polymer precursors (polysilazane) is a technologically and economically interesting way to produce thin ceramic coatings. However, many cracks appear and decohesion occurs during pyrolysis when the ceramic coatings (SiOCN) are thicker than 0.5 micrometers. In order to understand these cracking phenomena, the coatings are mechanically characterized by nanoindentation at different stages of the pyrolysis heat treatment.During pyrolysis, the cracking temperature is detected by in-situ optical observation. The thickness of the coatings varies during pyrolysis from 3 micrometers at the polymeric state to 1 micrometer at the ceramic state. The coatings' properties, hardness and Young's modulus are evaluated after heat treatment, taking into account the substrate's influence. A large variation of these properties occurs at the cracking temperature. Both the hardness and the Young's modulus are multiplied by a factor of 10. By analysing these results, we show that cracking is correlated with the evolution of the coatings' mechanical properties during the transformation.

scholarly journals Toward Advanced Functional Systems: Honeycomb-Like Polymeric Surfaces Incorporating Polyoxovanadates with Surface-Appended Copper-Cyclam Complexes

Molecules ◽  
2019 ◽  
Vol 24 (12) ◽  
pp. 2313
Author(s):  
Leire Ruiz-Rubio ◽  
Beñat Artetxe ◽  
Leyre Pérez-Álvarez ◽  
Jagoba Martín-Caballero ◽  
Tatsumi Ishihara ◽  
...  
Keyword(s):  
Acrylic Acid ◽  
Secondary Ion Mass Spectrometry ◽  
Ion Beam ◽  
Polymeric Films ◽  
Patterned Surfaces ◽  
Polymeric Surfaces ◽  
Inorganic Films ◽  
Excellent Method ◽  
Cyclam Complexes

In this work the immobilization of hybrid polyoxometalates (POMs) onto functional polymeric surfaces is exposed and discussed. Thus, various hybrid polymer‒inorganic films were prepared by anchoring selected hybrid POMs onto tailored polymeric surfaces that consisted of breath figures (BFs) made of polystyrene-b-poly(acrylic acid)/polystyrene (PS-b-PAA/PS) blends. Functionalization of the BF films was performed by selective arrangement of acrylic acid groups of the amphiphilic block copolymer on the surface pores because of their affinition for the water condensed during breath figure formation. These carboxylic acid functional groups contained within the PAA blocks were then employed to anchor [Cu(cyclam)][{Cu(cyclam)}2(V10O28)]·10H2O (1-CuV10) and [{Cu(cyclam)}(VO3)2]·5H2O (1-CuV1), hybrid POMs by immersing the films into aqueous solutions of the in situ formed hybrid clusters, resulting in the hybrid films BF1 and BF2, respectively. Superficial analysis of these hybrid polymeric films was carried out by the sophisticated ion beam-based technique time-of-flight secondary ion mass spectrometry (ToF-SIMS) that was revealed to be an excellent method for the superficial compositional mapping of patterned surfaces.

scholarly journals Synthesis of CdS nanocrystals in polymeric films studied by in-situ GID and GISAXS

2015 ◽  
Vol 1810 ◽  
Author(s):  
Tiziana Di Luccio ◽  
Dina Carbone ◽  
Silvia Masala ◽  
Karthik Ramachandran ◽  
Julie Kornfield
Keyword(s):  
Hexagonal Lattice ◽  
Grazing Incidence ◽  
Lattice Parameter ◽  
Polymeric Films ◽  
Diffraction Intensity ◽  
Cds Nanocrystals ◽  
Grazing Incidence Diffraction ◽  
Angle Scattering ◽  
Precursor Structure

ABSTRACTIn this work, we describe the synthesis of CdS nanocrystals in thin polymeric films by in-situ Grazing Incidence Diffraction (GID) and Grazing Incidence Small Angle Scattering (GISAXS). The 2D GISAXS patterns indicate how the precursor structure is altered as the temperature is varied from 25°C to 300°C. At 150°C, the CdS nanocrystals start to arrange themselves in a hexagonal lattice with a lattice parameter of 27 Å. The diffraction intensity from the hexagonal lattice reaches a maximum at 170°C and decreases steadily upon further heating above 220°C indicating loss of symmetry. Correspondingly, the GID scans at 170°C show strong crystalline peaks from cubic CdS nanocrystals that are about 2 nm size. The results indicate that a temperature of 170°C is sufficient to synthesize CdS nanocrystals without degradation of the polymer matrix (Topas) in thin films (about 30nm).

In-situ thin coating of silica micro/nano-particles on polymeric films and their anti-fogging application

2020 ◽  
Vol 607 ◽  
pp. 125444
Author(s):  
Sharon Bretler ◽  
Naftali Kanovsky ◽  
Taly Iline-Vul ◽  
Sarit Cohen ◽  
Shlomo Margel
Keyword(s):  
Polymeric Films ◽  
Nano Particles ◽  
Thin Coating

scholarly journals Poly(styrene)/oligo(fluorene)-intercalated fluoromica hybrids: synthesis, characterization and self-assembly

2014 ◽  
Vol 5 ◽  
pp. 2450-2458 ◽  
Author(s):  
Giuseppe Leone ◽  
Francesco Galeotti ◽  
William Porzio ◽  
Guido Scavia ◽  
Luisa Barba ◽  
...  
Keyword(s):  
Self Assembly ◽  
In Situ Polymerization ◽  
Polymeric Films ◽  
Homogeneous Distribution ◽  
Solid Films ◽  
Polymer Hybrid ◽  
Interlayer Region ◽  
Microporous Films ◽  
Enhanced Photostability

We report on the intercalation of a cationic fluorescent oligo(fluorene) in between the 2D interlayer region of a fluoromica type silicate. The formation of intercalated structures with different fluorophore contents is observed in powders by synchrotron radiation XRD. Successively, the hybrids are dispersed in poly(styrene) through in situ polymerization. Such a procedure allows us to synthesize the materials from solution, to achieve solid films, and to characterize them by optical and morphologic techniques. The polymeric films with homogeneous distribution of the hybrids exhibit ultraviolet–blue photoluminescence with a significantly enhanced photostability compared to the bare oligo(fluorene)s. Finally, under specific conditions, the polymer hybrid with higher oligo(fluorene) content spontaneously assembles into highly ordered microporous films.

Second Order Nonlinear Optical Properties of Multifunctional Chiral Azobenzene Polymers

e-Polymers ◽  
2008 ◽  
Vol 8 (1) ◽  
Author(s):  
Luigi Angiolini ◽  
Tiziana Benelli ◽  
Renato Bozio ◽  
Matteo Cozzuol ◽  
Loris Giorgini ◽  
...  
Keyword(s):  
Main Chain ◽  
Second Harmonic ◽  
Optically Active ◽  
Polymeric Films ◽  
Side Chain ◽  
Nlo Properties ◽  
Azobenzene Moiety ◽  
Corona Poling ◽  
Thermal Stability Of

AbstractCorona poling behaviours of optically active photochromic copolymers derived from methyl methacrylate (MMA) and the methacrylic ester of (S)-3- hydroxy pyrrolidine linked through the nitrogen atom to the highly conjugated photochromic 4'-(β-cyano-β-(methylsulfonyl)vinyl)-4-azobenzene moiety, have been investigated with the aim to evaluate the effect on the non-linear optical (NLO) properties originated by the presence of inactive side-chain MMA groups along the main chain. The NLO properties of in situ corona poled polymeric films have been studied by second harmonic generation (SHG) measurements. The d33 values of the investigated polymers were determined to be in the range 10-86 pm/V after corona poling. The temporal and thermal stability of the optimal SHG signals obtained after corona poling process of all the macromolecular materials has been investigated and compared. The results indicate that the maximum of these properties can be obtained at a molar content of photochromic units around 20- 40%.

Elastic Behaviour of Thin Stabilized-Zirconia Coatings

2004 ◽  
Vol 443-444 ◽  
pp. 77-82 ◽  
Author(s):  
Paolo Scardi ◽  
Matteo Leoni ◽  
M. Loch ◽  
G. Barbezat
Keyword(s):  
Stress Gradient ◽  
Elastic Behaviour ◽  
X Ray Diffraction ◽  
Stabilized Zirconia ◽  
Thin Coatings ◽  
X Ray ◽  
Radiation Sources ◽  
Equiaxed Grains ◽  
Low Pressure Plasma Spraying

The residual stress in thin coatings of yttria stabilised-zirconia produced by Low Pressure Plasma Spraying were measured by X-ray Diffraction, using laboratory as well as synchrotron radiation sources. The specific microstructure, with absence of texture and fine distribution of nearly equiaxed grains, point out that despite the markedly anisotropic nature of cubic zirconia, coatings can be considered as macroscopically isotropic. This picture is also confirmed by the results of a parallel study, where the X-ray elastic constants were measured in-situ along two crystallographic directions ([440] and [620]): measured values agree fairly well with those calculated from single-crystal data under the Neerfeld-Hill assumptions. SR XRD provided a detailed information on the stress field across the thickness of the zirconia coatings. In particular the presence of a stress gradient was observed and modelled. The average stress is compressive, and increases with the coating thickness. Compression tend to increase from the surface toward the inside of the coating reaching a maximum of ~-1.0 GPa in a 24 µm coating.

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