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RAFT-Living polymerization / Sanvi Vaibhav Nirgun in PAINTINDIA, Vol. LXIII, N° 5 (05/2013)

[article]  inPAINTINDIA > Vol. LXIII, N° 5 (05/2013) . - p. 53-67 Titre : RAFT-Living polymerization Type de document : texte imprimé Auteurs : Sanvi Vaibhav Nirgun, Auteur Année de publication : 2013 Article en page(s) : p. 53-67 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Polymérisation par transfert de chaîne réversible par addition fragmentation La polymérisation radicalaire contrôlée par transfert de chaîne réversible par addition-fragmentation (en anglais Reversible Addition-Fragmentation Chain Transfer (RAFT)) est une technique de polymérisation radicalaire contrôlée. Au même titre que la polymérisation radicalaire contrôlée par transfert d'atome (en anglais Atom Transfert Radical Polymerization (ATRP)) et la polymérisation radicalaire en présence de nitroxydes (en anglais Nitroxide Mediated Polymerization (NMP)), la polymérisation de type RAFT permet de synthétiser des polymères d'architecture contrôlée (polymères à blocs, étoiles, peignes, etc) de faible polydispersité et de haute fonctionnalité. Les applications de ces polymères sont, parmi d'autres, l'encapsulation de principes actifs de médicaments, la production de revêtements et peintures de nouvelles génération, la microfluidique, les tensioactifs, les adhésifs et les membranes. Index. décimale : 668.9 Polymères Résumé : Synthetic polymers are essential elements of modem life. Several methods have been developed over the years to attain control of radical polymerizations. In all cases, the optimization of organic compounds was the key step. The new process — RAFT (Reversible Addition-Fragmentation Chain Transfer) technology is a living radical polymerization process that provides a mechanism for precisely controlling the way in which small molecules are linked together to form large polymer chains. RAFT polymerization is known for its compatibility with a wide range of monomers compared to other controlled radical polymerizations. These monomers include (meth)acrylates, (meth)acrylamides, acrylonitrile, styrene and derivatives, butadiene, vinyl acetate and N-vinylpyrrolidone. This work has revolutionized polymer synthesis and spawned a new generation of polymeric materials. Mankind will benefit from the development of a wide range of new materials for many different applications including: biomedical, coatings, lubricants, industrial polymers, personal care and cosmetics, and electronics. RAFT is a promising candidate for answering both the increasing need of modern society to employ highly functional polymeric materials and the global requirements for developing sustainable chemicals and processes. Note de contenu : - HISTORY : Important components of RAFT - THE RAFT AGENT - WHAT IS RAFT POLYMERIZATION ? - CLASSES OF RAFT AGENTS : How to select RAFT agents - RAFT MECHANISM : RAFT agent to monomer compatibility - WIDE RANGE OF GRADIENT AND BLOCK COPOLYMER : Synthesis of gradient and block copolymers - Synthesis of star polymers (Star polymers from a core first approach) - Z approach versus R approach (Star polymers via an arm first methodology) - Synthesis of graft and comb copolymers - Synthetic approaches to hyperbranched & nanogel polymers (soluble products) - Gels and hydrogels (insoluble products) - NANOMATERIAL SYNTHESIS : Micelles - Vesicles and more complex architectures - Synthesis of hybrid nanoparticles - Carbon nanotubes, nanodiamond and graphene - Metallic and oxide nanoparticles : silica nanoparticles (Iron oxide nanoparticles) - Gold, silver nanoparticles and quantum dots - POLYMERS FOR BIO-APPLICATIONS : protein/peptide polymer conjugates - siRNA/DNA polymers conjugates - Glycopolymers - SURFACE MODIFICATIONS : Preparation of honeycomb films - STRENGTH RAFT : Current challenges and scopes in RAFT chemistry - Challenge in understanding the kinetics and mechanism - Facile access to RAFT agents and commercial availability - Accessible monomer range - Block copolymer formation and access to universal RAFT agents - SCOPE FOR THE USE OF RAFT POLYMERS : Large scale industrial - Nano- and microsctructured materials - Exploiting thio carbonylthio endgrou chemistry - Employing the RAFT process as a kinetic tool Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18970 [article]

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Superamphiphobic coating : combination of superhydrophobicity and superoloephobicity / Aarti Purushottam More in PAINTINDIA, Vol. LXIII, N° 5 (05/2013)

[article]  inPAINTINDIA > Vol. LXIII, N° 5 (05/2013) . - p. 68-72 Titre : Superamphiphobic coating : combination of superhydrophobicity and superoloephobicity Type de document : texte imprimé Auteurs : Aarti Purushottam More, Auteur ; Shashank T. Mhaske, Auteur Année de publication : 2013 Article en page(s) : p. 68-72 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Angle de contact Hydrophobie Oléophobie Revêtement auto-nettoyant:Peinture auto-nettoyante Sol-gel, Procédé Surfaces (Physique) Surfaces (technologie) Index. décimale : 667.9 Revêtements et enduits Résumé : Superhydrophobic coatings are those with water contact angle more than 1500 and superoleophobic coatings are oil repellent with resistance to most of the organic liquid. Superamphiphobic coatings are the new advance approach of the coating which combines the advantages of above two coatings and act as oil and water repellent at the same time. Due to this combined advantage it can act as self cleaning coating, Antifingerprint coating, Anticorrosive coating, Anti-smudge coating at the same time and helps to improve the durability and service life of the substrate on which this coating is applied. The creation of this coating is based on the principle of chemical composition and surface topography. The surface can be make superamphiphobic by various methods like sol-gel coating, electrospinning in case of fiber, plasma etching in case of plastic substrate etc. Note de contenu : - INTRODUCTION : What do you mean by superamphiphobicity ? - HOW TO CREATE SUPERAMPHIPHOBIC SURFACE ? : By sol-gel method - Preparation of the fluorinated silica nanoparticle - Superamphiphobic coating with the help of candle soot - Plasma etching technique for generation of superamphiphobic surface - Electrospinning method to generate superamphiphobic surface on the fibers - Formation of superamphiphobic surface on metal substrate - Grafting of fluorinated compound - SuperamphiphobicDiblock copolymer coatings - Superamphiphobic conductive coating - Transparent superamphiphobic surface - CHARACTERIZATION OF SUPERAMPHIPHOBIC SURFACE : Contact angle measurement - Contac angle hysterisis - Rolling angle measurement - SUPERAMPHIPHOBIC COATING OR SURFACE APPLICATIONS Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18971 [article]

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Corrosion and its impact on the economy / P. K. Kamani in PAINTINDIA, Vol. LXIII, N° 5 (05/2013)

[article]  inPAINTINDIA > Vol. LXIII, N° 5 (05/2013) . - p. 104-107 Titre : Corrosion and its impact on the economy Type de document : texte imprimé Auteurs : P. K. Kamani, Auteur Année de publication : 2013 Article en page(s) : p. 104-107 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Corrosion -- Aspect économique -- Inde Index. décimale : 667.9 Revêtements et enduits Résumé : This section of corrosion is being started to educate the people to fight against corrosion. Corrosion is basically a cancer to the metal. The loss due to corrosion is innumerable about 3-4% of GDP and account to around Rs. 2 lakh crore per annum in India alone. The most astonishing part is that we can control this loss by 30-35% with the available technology but the proper education and knowledge about corrosion and its mitigation is lacking. It is said that corrosion never sleeps. Corrosion is recognized as one of the most serious problems in our modem societies and the resulting losses each year are in the hundreds of billions of dollars. Cost of corrosion studies have been undertaken by several countries including, the United States, the United Kingdom, Japan, Australia, Kuwait, Germany, Finland, Sweden, India, and China. Under this section, corrosion would be discussed broadly from micro to macro including form of corrosion, internai and external factors responsible for corrosion, corrosion in various sectors, metallic and non metallic corrosion, corrosion testing and also its remedial measure, cure and control. Note de contenu : - Corrosion damage - Sectors, under high corrosion attack - India's corrosion map - Corrosion control philosophy and management - Organisations and associations Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18972 [article]

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Oxymer M112 - Use in anionic polyurethane dispersions / Malin Rex in PAINTINDIA, Vol. LXIII, N° 5 (05/2013)

[article]  inPAINTINDIA > Vol. LXIII, N° 5 (05/2013) . - p. 150-156 Titre : Oxymer M112 - Use in anionic polyurethane dispersions Type de document : texte imprimé Auteurs : Malin Rex, Auteur ; S. Ramakrishnan, Auteur ; Bhushan Saindane, Auteur Année de publication : 2013 Article en page(s) : p. 150-156 Langues : Anglais (eng) Catégories : Anions Diols Dureté (matériaux) Polycarbonates Polymères aliphatiques Polymères en émulsion Polyuréthanes Résistance à l'humidité Résistance chimique Séchage Index. décimale : 668.9 Polymères Résumé : This technical paper presents information concerning a versatile aliphatic polycarbonate diol that has been developed by Perstorp and evaluated in aqueous anionic polyurethane dispersions. The comparison is made against polyurethane dispersions using the conventional macrodiols like polyether and polyester. This new class of polycarbonate macrodiols includes homopolymers derived from 2,2-dialkyl-l,3-propanediols.Films were cast from the aqueous polyurethane dispersions and evaluated according to different coating evaluation methods such as hardness, drying, solvent, acid and alkali resistance. This newly developed polycarbonate shows a high hardness, good drying property, excellent water, acid and base resistance. Note de contenu : - INTRODUCTION TO POLYURETHANE DISPERSIONS : Use of polycarbonate diols - GENERAL PROPERTIES OF OXYMER M112 (pOLYCARBONATE DIOL) - EXPERIMENTAL - PRE-POLYMÈRE FORMULATIONS AND SYNTHESIS PROCEDURE - STAGE 1 - STAGE 1 - SYNTHESIS PROCEDURE - STAGE 2 - CHAIN EXTENSION, NEUTRALIZATION AND DISPERSION : Neutralization and chain extension procedure - TESTING PROCEDURES : Hardness was - Solvent resistance - Shear stability Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18973 [article]

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