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Degradation and stability of polymers in presence of titanium dioxide / Zeba Fahreen in PAINTINDIA, Vol. LVI, N° 1 (01/2006)
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Titre : Degradation and stability of polymers in presence of titanium dioxide Type de document : texte imprimé Auteurs : Zeba Fahreen, Auteur ; Vinod C. Malshe, Auteur Année de publication : 2006 Article en page(s) : p. 49-62 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alumine
Dioxyde de titane
Photocatalyse
Polymères -- Détérioration
SiliceLa silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux.
La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...).
Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale.Index. décimale : 667.9 Revêtements et enduits Résumé : TiO2 is one of the most widely used opacifier for paint and polymers. The semiconductor like band structure of TiO2 imparts properties like UV absorption as well as photosensitizing propertÃes. Lot of research has been done on the photocatalytic activity of TiO2. It has been proved that TiO2 degrades most of the organics leading to complete mineralization into water and carbon dioxide. Similar degradation is also expected in polymers. Moreover, TiO2 not only degrades the polymer but also hampers the activity of the other additives present. This photocatalytic activity depends on many parameters like the type of molecule, the crystal structure and particle size of TiO2 etc. This activity of TiO2 can be curbed by coating it with silica, alumina etc. Thus, coated nanosized rutile form of TiO2 can act as a transparent UV block. Moreover, TiO2 may be used for the degradation of polymeric waste as it gives environmentally benign products. This may have potential to solve the problem of plastic waste disposal. Note de contenu : - Titanium dioxide
- Photocatalic activity of titanium dioxide
- Degradation of molecules by TiO2
- TiO2 in polymers
- Nano TiO2 : Novel approach to UV stabilization of polymers
- Relative activity of TiO2 particles (coated and uncoated)Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11539
in PAINTINDIA > Vol. LVI, N° 1 (01/2006) . - p. 49-62[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 004700 - Périodique Bibliothèque principale Documentaires Disponible Formulate a ceiling paint, save money for your client, make more profit / Vinod C. Malshe in PAINTINDIA, Vol. LXXIII, N° 7 (07/2023)
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Titre : Formulate a ceiling paint, save money for your client, make more profit Type de document : texte imprimé Auteurs : Vinod C. Malshe, Auteur Année de publication : 2023 Article en page(s) : p. 68-70 Langues : Anglais (eng) Catégories : Copolymère styrène acrylique
Coût -- Contrôle
Formulation (Génie chimique)
Plafonds
Polyacryliques
Revêtements:PeintureIndex. décimale : 667.6 Peintures Résumé : I retired as Prof of Paint Technology in Feb 2007 from UDCT Matunga Mumbai. I taught 14 batches from 1993 tilt 2007. As a measure of cost saving, I taught all my students to introduce a separate product in domestic sector architectural fin ishes and that is a different coating for ceiling. Except one student, no one entered paint manufacture though most of thenn are employed in paint industry in high positions. He too has not used this idea in spite of repeated reminders. Total number of students I taught was about 130 in 14 years due to very low intake in UDCT Paint Technology course. When I see the attendance in IPA and ISSPA conferences, I am amazed to know the number of young people involved in paint manufacture. The number of attendees was in excess of 1500 in both gatherings put together. I thought I will throw this idea for the entire paint industry for the benefit of the user and entrepreneur alike. Note de contenu : - Table 1 : Guideline formulation of acrylic or styrene acrylic washable distemper for ceiling paint
- Table 2 : Specifications : anucryl op 2023
- Table 3 : Properties of the product paintEn ligne : https://drive.google.com/file/d/1FbM40jkPQXX6OEquY2PWExTxg5CEtNFf/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40052
in PAINTINDIA > Vol. LXXIII, N° 7 (07/2023) . - p. 68-70[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 24178 - Périodique Bibliothèque principale Documentaires Disponible Photodegradation of polymers, relevance for a coating chemist - Part II / Gurpreet Onkar Singh in PAINTINDIA, Vol. LX, N° 5 (05/2010)
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Titre : Photodegradation of polymers, relevance for a coating chemist - Part II Type de document : texte imprimé Auteurs : Gurpreet Onkar Singh, Auteur ; Vinod C. Malshe, Auteur Année de publication : 2010 Article en page(s) : p. 81-96 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Photodétérioration
Polymères -- Détérioration
PolystyrèneIndex. décimale : 667.9 Revêtements et enduits Note de contenu : - Influence of morphology
- Combination of photo and biodegradation
- Practical of photodegradable polymers
- Fig. 13 : The variation of absorbance of carbonyl band with the exposure time for various
- Fig. 14 : Change of yield stress v/s photodegradation time in UV chamber
- Fig. 15 : Change of strain at break v/s photodegradation time in UV chamber
- Fig. 16 : Photo induced weight loss of the polymer films under air or nitrogen atmosphere
- Fig. 17 : FT-IR spectra of volatile products evolved from the irradiated PVC-TiO2 (1.5 wt. %) film under air. The inset shows the evolved CO2 concentration as a function of the irradiation time
- Fig. 18 : Changes of average molecular weight polydispersity and gel amount in PS and PS with ketones after UV irradiation
- Fig. 19 : Mechanism for photodegradation of PS
- Fig. 20 : Mechanism for iniatiationof photodegradation of PS by benzophenone
- Fig. 21 : Structure of WD-70 silicone
- Fig. 22 : Weight loss curve of pure PS, PS-TiO2 and PS-GTiO2 composite films under illuination in air
- Fig. 23 : Formation of active oxygen species
- Fig. 24 : Dissociation of main chain of polystyrene containing carbonyl group
- Table 3 : Stress-at-break of PS and PS with ketones (A=acetophenone, B=benzophenone) before and after UV irradiation
- Table 4 : The variation of molecular weight of polymer films with irradiation time by GPCPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34604
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Code-barres Cote Support Localisation Section Disponibilité 012292 - Périodique Bibliothèque principale Documentaires Disponible Polyols and polyurethanes from renewable sources : past, present and future—part 1 : vegetable oils and lignocellulosic biomass / Ritesh S. Malani in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 1 (01/2022)
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Titre : Polyols and polyurethanes from renewable sources : past, present and future—part 1 : vegetable oils and lignocellulosic biomass Type de document : texte imprimé Auteurs : Ritesh S. Malani, Auteur ; Vinod C. Malshe, Auteur ; Bhaskar Narayan Thorat, Auteur Année de publication : 2022 Article en page(s) : p. 201-222 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Biomasse
Biopolymères -- Synthèse
Huiles et graisses végétales
Isocyanates
Lignocellulose
Polymères -- Recyclage
Polyols
Polyuréthanes
Ressources renouvelablesIndex. décimale : 667.9 Revêtements et enduits Résumé : Polyurethanes, a major class of polymers conventionally derived from petroleum products, find applications in numerous sectors. Limited fossil resources, their extensive usage, large carbon footprint and alarming environmental issues motivated the research community worldwide in finding alternate and renewable routes for one of the key raw materials, polyols and isocyanate precursors. There are several reports available in the literature showing the techno-economic viability of bio-based polyols and hence polyurethanes. This article summarizes the synthesis of renewable polyols and polyurethanes thereof through utilization of various renewable sources such as vegetable oils, lingo-cellulosic biomass and other feedstock. The polyols obtained from different starting materials lead to variation in hydroxyl number and ultimately have a profound impact on the properties of polyurethanes. Hydroxyl groups are further classified based on their presence in polyols. Primary hydroxyl groups present in polyols hold the mechanical and thermal performance of final polyurethanes better. In this context, the recent advancements in increasing the primary hydroxyl groups in bio-based polyols through different chemical transformation has been focused on here. Moreover, the developments in the synthesis of polyurethane foam without the use of isocyanates have been considered as a green polymer. The ever-increasing demand in the market and the high potential of renewable sources will lead to further advancement in commercialization of bio-based polyurethanes. Note de contenu : - Vegetable oil-derived polyols and polyurethane : Seed oils for PU synthesis having integral hydroxyl group - Seed oils for PU synthesis without hydroxyl group
- Biomass-derived polyols and polyurethane : Lignocellulosic polyols from oxypropylation of lignin and corresponding PUs - Polyols from liquefaction of lignocellulosic biomass and corresponding PUs
- Reusability and recycling of polyurethanes
- Summary and future opportunitiesDOI : https://doi.org/10.1007/s11998-021-00490-0 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00490-0.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37154
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Code-barres Cote Support Localisation Section Disponibilité 23313 - Périodique Bibliothèque principale Documentaires Disponible Polyols and polyurethanes from renewable sources : past, present, and future - part 2 : plant-derived materials / Ritesh S. Malani in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 2 (03/2022)
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Titre : Polyols and polyurethanes from renewable sources : past, present, and future - part 2 : plant-derived materials Type de document : texte imprimé Auteurs : Ritesh S. Malani, Auteur ; Vinod C. Malshe, Auteur ; Bhaskar Narayan Thorat, Auteur Année de publication : 2022 Article en page(s) : p. 361-375 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Glucides
Matières premières
Polyols
Polyuréthanes
Protéines
Recyclage (déchets, etc.)
Ressources renouvelablesIndex. décimale : 667.9 Revêtements et enduits Résumé : Polyols are basically compounds containing multiple reactive hydroxyl groups and one of the major constituting elements in making polyurethane and polyurethane foam. Traditionally, the polyols are obtained from fossil fuels. The limited availability of fossil fuels and exponentially increasing demand of polymers including PUs enforce the scientific society to explore the possible alternate sources for obtaining polyols. In order to reduce the dependency of polyols on fossil fuels, renewable polyols have gained significant importance over the last few decades. Various biomass and renewable sources have been explored to obtain the polyols. The present review, which is a continuation of our earlier work, highlights various other starting raw materials of plant origin for obtaining the renewable polyols and corresponding methodologies. The review also attempts to make a strong connection between the starting material for making polyols, chemical transformations employed, and the properties of polyols as well as final PUs. The comprehensive analysis of renewable polyols and corresponding PUs will help researchers in making commercially viable renewable polyols to fulfill the increasing demand. Note de contenu : - Carbohydrate-derived polyols and polyurethanes
- Starch-derived polyols and polyurethane
- Protein-derived polyols and polyurethane
- Other plant-derived polyols and polyurethane : Eugenol - Cardanol and CNSL - Terpenes, terpenoids, and rosins - Methanol and ethanol derivatives
- Table 1 : Carbohydrate-derived short-chain polyols with basic properties
- Table 2 : Alcohol-derived short-chain polyols with basic propertiesDOI : https://doi.org/10.1007/s11998-021-00534-5 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00534-5.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37267
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