A review on recent developments in polyurethane/acrylate hybrid dispersions / Vilas D. Athawale in PAINTINDIA, Vol. LIX, N° 10 (10/2009)

[article]  inPAINTINDIA > Vol. LIX, N° 10 (10/2009) . - p. 67-96 Titre : A review on recent developments in polyurethane/acrylate hybrid dispersions Type de document : texte imprimé Auteurs : Vilas D. Athawale, Auteur ; A. Kulkarni, Auteur Année de publication : 2009 Article en page(s) : p. 67-96 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Copolymères greffés Polymères en émulsion Polymérisation en émulsion Polyuréthanes Revêtements:Peinture Index. décimale : 667.9 Revêtements et enduits Résumé : Development of high quality coatings with zero to low VOCs is one of the most difficult challenges that the coating industries are facing today. Various approaches to meet the new requirements, particularly to reduce VOC emissions, are being pursued. The use of waterborne coatings has increased substantially and has surpassed solventborne in volume. Aqueous polyurethane dispersion (PUD) is one such boon to coating industry. Due to potential large volume of applications combined with versatility in the properties, a good amount of work is being done on this topical issue of aqueous polyurethane dispersions. Howver, the controversy over the cost and hydrolytic stability of PUDs has driven researchers to concentrate on hybrid coatings. Many attempts have been made to trim down the relatively high cost of PUDs and to match their performance attributes with solvent borne coatings. Due to consistent efforts put in by many researchers in this field during the last couple of decades, significant progress has been accomplished in developing the understanding of the subject. Several papers and few review articles have come out that are devoted to use of these products and their commercial applications. The aim of this review is to offer a better understanding of the basic aspect of the hybrid polyurethane dispersions, with the hope that it may serve both as a reference work and as a starting point for future work. This article is an extensive review of the literature on aqueous polyurethane/acrylate hybrid systems that use water as a carrier. It generally covers the period from 1981 to 2009 with special emphasis on recent development after the turn of century. This review will give a general overview of the polyurethane dispersion, their synthesis and modification techniques as well as strategies used for the preparation of the PUDs and hybrids, putting a number of recent studies into collective context. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8317 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
011951	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Synthesis and structure-property evaluation of polyurethane dispersions based on various dicarboxylic acids / Vilas D. Athawale in PAINTINDIA, Vol. LX, N° 2 (02/2010)

[article]  inPAINTINDIA > Vol. LX, N° 2 (02/2010) . - p. 79-88 Titre : Synthesis and structure-property evaluation of polyurethane dispersions based on various dicarboxylic acids Type de document : texte imprimé Auteurs : Vilas D. Athawale, Auteur ; A. Kulkarni, Auteur Année de publication : 2010 Article en page(s) : p. 79-88 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colloides Dispersions et suspensions Polyesters Polyols Polyuréthanes Revêtements en phase aqueuse:Peinture en phase aqueuse Solutions aqueuses (chimie) -- Stabilité Index. décimale : 667.9 Revêtements et enduits Résumé : A series of polyurethane anionomer dispersions (PUD) was prepared from isophorone diisocyanate, polyester polyol and dimethylol propionic acid as a hydrophilic monomer. The principal polyols used were aromatic, aliphatic and cycloaliphatic type. The effect of polyol type was evaluated in terms of thermal, mechanical and physico-chemical properties of PUD samples. The results revealed that the chain flexibility affected particle-size. During phase inversion the dispersed phase can be more easily broken into smaller particles. The aromatic ring structure of dicarboxylic acid provided the PUD with rigidity which is manifested in high tensile strength, hardness and chemical resistance. However, such coatings suffer limitations with respect to low colloidal and thermal stabiltiy. The studies on film properties revealed that the polyurethane dispersion based on 1, 4 cyclohexane dicarboxylic acid exhibits better properties as compared to aromatic and aliphatic dicarboxylic acids. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9385 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
012174	-	Périodique	Bibliothèque principale	Documentaires	Disponible

---

1 (1 - 2 / 2)