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Dual approach of bimodality and nano-reinforcement towards toughened PDMS based foul release coatings / Sangram K. Rath in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 3 (05/2021)
[article]
Titre : Dual approach of bimodality and nano-reinforcement towards toughened PDMS based foul release coatings Type de document : texte imprimé Auteurs : Sangram K. Rath, Auteur ; S. Praveen, Auteur ; Jayesh G. Chavan, Auteur ; Srikanth Billa, Auteur ; T. Umasankar Patro, Auteur ; Manoranjan Patri, Auteur Année de publication : 2021 Article en page(s) : p. 871-885 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Angle de contact
Argile
Caractérisation
Dispersions et suspensions
Mouillabilité
Nanoparticules
PolydiméthylsiloxaneLe polydiméthylsiloxane —[O-Si(CH3)2]n—, ou poly(diméthylsiloxane) selon la nomenclature systématique, communément appelé PDMS ou diméthicone, est un polymère organominéral de la famille des siloxanes souvent présent dans les shampoings. On l'y ajoute pour augmenter le volume des cheveux mais il peut également aller boucher les pores du cuir chevelu et rendre les cheveux gras. C'est une des raisons pour lesquelles se laver les cheveux tous les jours est très déconseillé avec un shampooing contenant des silicones.
Il existe également de l'amodiméthicone, qui est un dérivé du diméthicone.
Le polydiméthylsiloxane est un additif alimentaire (E900), utilisé comme antimoussant dans les boissons (Coca-Cola BlāK).
La chaîne de poly(diméthylsiloxane) forme également la structure de base des huiles et des caoutchoucs silicones.
Renfort minéral
Revêtements -- Propriétés mécaniques
Revêtements antisalissuresIndex. décimale : 667.9 Revêtements et enduits Résumé : It is well established that crosslinked polydimethylsiloxane (PDMS) based coatings have efficacious foul release characteristics. However, a trade-off between mechanical integrity of filled and crosslinked PDMS based coatings and their foul release performance has been a bottleneck for producing efficient and durable coatings. In the present study, we report a dual approach of nano-reinforcement of a bimodal PDMS network as a strategy to produce simultaneously reinforced and toughened PDMS networks with facile release of macrofoulants from their surfaces. The nanocomposites of both unimodal and bimodal PDMS networks were prepared using oligomeric dihydroxyl functional PDMS precursor chains differing in their molecular weights by a factor of five and commercial Cloisite-20A nanoclay as the nanofiller. The clay layers were found to be mildly intercalated in the PDMS matrix, as revealed from investigations by scattering and imaging techniques at different length scales. While the unimodal PDMS networks did show nanoclay induced simultaneous reinforcement and toughening, at equivalent clay loadings, the bimodal PDMS nanocomposites seemed to stretch further with characteristic strain hardening before fracture. Dynamic mechanical analysis (DMA) and swelling studies of the nancomposites further confirmed the nanoclay induced reinforcement effect of the bimodal PDMS host matrix. The intrinsic low surface energy characteristics of PDMS were retained by bimodal blending of long and short chains and its subsequent nano-reinforcement. Macrofouling studies by panel immersion and release force measurements revealed that the macrofoulants could be dislodged from the nanocomposite coatings with a shear force < 0.05 MPa. Note de contenu : - EXPERIMENTAL : Materials - Preparation of unimodal and bimodal PDMS networks and their nanocomposites - Characterization techniques
- RESULTS AND DISCUSSION : Clay dispersion morphology - Surface wettability
- MECHANICAL PROPERTIES
- SWEELING STUDIES : Macrofouling and foul release characteristics
- Table 1 : Contact angle and surface energy of pristin unimodal and bimodal PDMS networks and their nanocomposites
- Table 2 : Tensile properties of unimodal and bimodal PDMS networks and their nanocomposites at different clay loadingsDOI : https://doi.org/10.1007/s11998-020-00450-0 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00450-0.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35936
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 3 (05/2021) . - p. 871-885[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 22785 - Périodique Bibliothèque principale Documentaires Disponible Photoinduced hydrophilicity and self-cleaning characteristics of silicone-modified soya alkyd/TiO2 nanocomposite coating / Sushil S. Pawar in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 3 (05-06/2020)
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Titre : Photoinduced hydrophilicity and self-cleaning characteristics of silicone-modified soya alkyd/TiO2 nanocomposite coating Type de document : texte imprimé Auteurs : Sushil S. Pawar, Auteur ; R. Baloji Naik, Auteur ; Sangram K. Rath, Auteur ; T. K. Mahato, Auteur ; Balasubramanian Kandasubramanian, Auteur Année de publication : 2020 Article en page(s) : p. 719–730 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Auto-nettoyage
Caractérisation
Charges (matériaux)
Dioxyde de titane
Formulation (Génie chimique)
Nanoparticules
Photocatalyse
Polyalkydes
Résistance aux conditions climatiques
Revêtements -- Additifs:Peinture -- Additifs
Revêtements organiques
SiliconesLes silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki).Index. décimale : 667.9 Revêtements et enduits Résumé : Nano-TiO2-dispersed polymeric coatings have been extensively studied in recent years owing to their photocatalytic-induced self-cleaning characteristics. However, durability and long-term retention of self-cleaning performance of such coatings remain a challenge for practical applications. In the present work, we report the self-cleaning properties of nano-TiO2/silicone soya alkyd-based coating formulations comprising 0.5–5 wt% of nanofiller as well as conventional additives of rutile TiO2 and BaSO4. The nanocomposites were prepared by an in situ process involving dispersion of nano-TiO2 in soya oil, soya alkyd synthesis by alcoholic process, followed by silicone modification. The coatings prepared from the nanofiller-dispersed resin showed significant UV radiation-induced hydrophilicity and photocatalytic degradation of methylene blue (MB) solution. A coating formulation with 2 wt% of nano-TiO2 loading showed a decrease in water contact angle from 87° to < 10° after 24 h of UV radiation exposure and a 50% decrease in intensity of the 664-nm absorbance peak of MB solution after 8 h of UV irradiation. Further, Fourier transform infrared spectroscopy in reflectance mode (ATR-FTIR) and thermogravimetric analysis (TGA) studies revealed minimal degradation of the host matrix after 500 h of accelerated weathering studies with retention of self-cleaning characteristics. These results imply that silicone-modified alkyd resin can be a suitable host matrix for combining the requisite properties of self-cleaning, organic contaminant degradation, photocatalytic stability, and weathering resistance for sustainable self-cleaning applications. Note de contenu : - EXPERIMENTAL DETAILS : Materials - Synthesis of silicone soya alkyd/nano-TiO2 resin - Preparation of paint
- CHARACTERIZATION METHODS
- RESULTS AND DISCUSSION : Photoinduced hydrophilicity and degradation of methylene blue solution - Self-cleaning characteristics Photocatalytic degradation of nanocomposite coatingDOI : https://doi.org/10.1007/s11998-019-00253-y En ligne : https://link.springer.com/content/pdf/10.1007/s11998-019-00253-y.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34102
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 3 (05-06/2020) . - p. 719–730[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21734 - Périodique Bibliothèque principale Documentaires Disponible Pigmented silicone/epoxy novel blends for preparation of stratified nontoxic foul release coatings / Sushil S. Pawar in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 4 (07/2022)
[article]
Titre : Pigmented silicone/epoxy novel blends for preparation of stratified nontoxic foul release coatings Type de document : texte imprimé Auteurs : Sushil S. Pawar, Auteur ; R. Baloji Naik, Auteur ; Sangram K. Rath, Auteur ; T. K. Mahato, Auteur ; Balasubramanian Kandasubramanian, Auteur Année de publication : 2022 Article en page(s) : p. 1269-1285 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alliages polymères
Animaux marins
Anticorrosifs
Anticorrosion
Caractérisation
Concentration pigmentaire volumique
Epoxydes
Essais d'adhésion
Formulation (Génie chimique)
Pigments inorganiques
Revêtements antisalissures
Revêtements autostratifiants
Revêtements organiques
SiliconesLes silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki).Index. décimale : 667.9 Revêtements et enduits Résumé : Incompatible polymer blends of epoxy and silicone were used for the preparation of single-coating system having anticorrosive and foul release properties by self-stratifying process. The single-coat application consists of a fixed 20 pigment volume concentration (PVC) anticorrosive bottom coat based on epoxy with a mixture of pigments like iron oxide, barytes, and zinc phosphate, and a fixed 10 PVC hydrophobic topcoat consisting of silicone resin and titanium dioxide pigment. Both the coatings were prepared separately in triple role and ball mill, respectively. Three different coating compositions were prepared by mixing silicone and epoxy coatings in different weight ratios (70:30, 80:20, and 90:10). Required amount of hardener, crosslinker, and catalyst were added to these prepared compositions separately prior to application and were thoroughly mixed and applied on mild steel and glass specimens. The prepared stratified coatings were named as STR-1, STR-2, and STR-3. The formation of self-stratification was confirmed by optical microscopy, FE-SEM, FTIR spectroscopy, and contact angle measurement. The coating systems were evaluated for adhesion, tensile strength, corrosion resistance, pseudobarnacle adhesion properties, and accumulation of foulant studies by immersion of test coupons in seawater. It is confirmed that there exists a most favorable stratified coating composition in terms of silicone and epoxy weight ratios which showed performance enhancement in terms of the hydrophobicity and foul release properties compared to other coating compositions. Note de contenu : - EXPERIMENTAL : Materials - Preparation of epoxy-based anticorrosive coating (bottom coat) and silicone-based fouling release coating (topcoat) - composition for 10 PVC silicone coating - Formulations of stratified fouling release coatings
- CHARACTERIZATION METHODS : Physical properties - FTIR spectroscopy - Measurement of contact angle - FESEM study - Electrochemical impedance spectroscopy (EIS) - Investigation of pseudobarnacle adhesion strength - Assessment of foul release property of stratified coatings in seawater - Resistance to corrosion under cathodic protection
- Table 1 : The composition for 20 PVC epoxy coating
- Table 2 : The composition for 10 PVC silicone coating
- Table 3 : Physical properties of stratified coatings
- Table 4 : Pseudobarnacle adhesion test of stratified coatings
- Table 5 : Experimental details for resistance to cathodic protectionDOI : https://doi.org/10.1007/s11998-021-00610-4 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00610-4.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38053
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Code-barres Cote Support Localisation Section Disponibilité 23574 - Périodique Bibliothèque principale Documentaires Disponible Structure–property correlations of foul release coatings based on low hard segment content poly(dimethylsiloxane–urethane–urea) / Sangram K. Rath in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 1 (01/2018)
[article]
Titre : Structure–property correlations of foul release coatings based on low hard segment content poly(dimethylsiloxane–urethane–urea) Type de document : texte imprimé Auteurs : Sangram K. Rath, Auteur ; Jayesh G. Chavan, Auteur ; Tanaji K. Ghorpade, Auteur ; T. Umasankar Patro, Auteur ; Manoranjan Patri, Auteur Année de publication : 2018 Article en page(s) : p. 185-198 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Copolymère uréthane-urée
PolydiméthylsiloxaneLe polydiméthylsiloxane —[O-Si(CH3)2]n—, ou poly(diméthylsiloxane) selon la nomenclature systématique, communément appelé PDMS ou diméthicone, est un polymère organominéral de la famille des siloxanes souvent présent dans les shampoings. On l'y ajoute pour augmenter le volume des cheveux mais il peut également aller boucher les pores du cuir chevelu et rendre les cheveux gras. C'est une des raisons pour lesquelles se laver les cheveux tous les jours est très déconseillé avec un shampooing contenant des silicones.
Il existe également de l'amodiméthicone, qui est un dérivé du diméthicone.
Le polydiméthylsiloxane est un additif alimentaire (E900), utilisé comme antimoussant dans les boissons (Coca-Cola BlāK).
La chaîne de poly(diméthylsiloxane) forme également la structure de base des huiles et des caoutchoucs silicones.
Revêtements antisalissures:Peinture antisalissures
Salissures biologiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : We report the foul release characteristics of model poly(dimethylsiloxane–urethane–urea) (PDMSPU)-based coatings with a relatively lower hard segment content of 9 to 13.7 wt%. The PDMSPUs were prepared by facile moisture curing of isophorone diisocyanate-capped hydroxyalkyl-terminated PDMS. The surface free energies of the coatings were tuned (20–25 mJ/m2) by varying the hard segment content to be in the minimum adhesive regime (20–30 mJ/m2) of Baier’s curve pertaining to the relative amount of biofouling vs the critical surface tension of various chemical substrates. A series of complimentary analytical tools, namely 1H NMR spectroscopy, small-angle x-ray scattering (SAXS), FTIR-attenuated total reflectance spectroscopy (FTIR-ATR), contact angle goniometry, marine field tests, and quantitative biofouling adhesion in shear, have been employed to deduce several physicochemical parameters of importance to establish the structure property correlations. Further, the time-dependant changes in surface wettability and surface concentration of polar functional groups of the coatings (immersed in 3.5 wt% aqueous solution of NaCl) were investigated by FTIR-ATR and contact angle goniometry. The extent of surface restructuring was found to increase with increasing hard segment content of the PDMSPUs and consequently increasing attachment strengths of macrofoulants with the coatings, which were in the range 0.12–0.5 MPa. Note de contenu : - Identification of the structure of PDMSPU
- Phase morphology and surface properties
- Macrofouling behavior and foul release characteristics
- Surface restructuring kinetics and mechanismDOI : 10.1007/s11998-017-9982-x En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9982-x.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30111
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Code-barres Cote Support Localisation Section Disponibilité 19610 - Périodique Bibliothèque principale Documentaires Disponible