Caprolactone modification of polyester resins / Nishant N. Prabhu in PAINTINDIA, Vol. LI, N° 10 (10/2001)

[article]  inPAINTINDIA > Vol. LI, N° 10 (10/2001) . - p. 43-48 Titre : Caprolactone modification of polyester resins Type de document : texte imprimé Auteurs : Nishant N. Prabhu, Auteur ; Deepak M. Bhatt, Auteur ; C. Suryanarayana, Auteur Année de publication : 2001 Article en page(s) : p. 43-48 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Caprolactone  'Matériau  modifié'  'Modification  chimique'  'Ester  polymère'  Liant  Formulation  Peinture  revêtement' Index. décimale : 667.9 Revêtements et enduits Résumé : Three caprolactone modified polyesters with similar raw material compositions were synthesized by varying the mode of reaction of caprolactone so as to get one polyester with a caprolactone chain as the side chain and two polyesters with a caprolactone chain in the backbone. The viscosities of these polyesters and the properties of the film obtained by curing these polyesters with HMMM were compared. An unmodified polyester was synthesized and used as control resin. While caprolactone modification was found to give lower viscosity, the lowering of the viscosity was significant in case of polyesters with caprolactone in the backbone. Incorporation of caprolactone in the backbone can lower the pencil hardness of the film, but this problem can be overcome by first polymerizing caprolactone to form polycaprolactone and then reacting it in the backbore. Caprolactone in the backbone also improves the cupping value of the film. Note de contenu : - Experimental : Materials - Synthesis - Unmodified polyester (UP) - Modofied polyester 1 (MP1) - Modified polyester 2 (MP2) - Modified polyester 3 (MP3) - Analysis : Characterization of the polyester resins - Crosslinking and characterization of coating films Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12623 [article]

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Liquid crystalline polymers for surface coatings / Nishant N. Prabhu in PAINTINDIA, Vol. LI, N° 5 (05/2001)

[article]  inPAINTINDIA > Vol. LI, N° 5 (05/2001) . - p. 41-48 Titre : Liquid crystalline polymers for surface coatings Type de document : texte imprimé Auteurs : Nishant N. Prabhu, Auteur ; Sunil V. Kulkarni, Auteur Année de publication : 2001 Article en page(s) : p. 41-48 Note générale : Bibliogr. Langues : Anglais (eng) Tags : 'Matériau  revêtement'  Liant  Polymère  'Cristal  liquide'  'Acrylique  dérivé  copolymère'  'Alkyde  résine'  'Ester  polymère'  'Epoxyde  'Peinture  haute  teneur  solide' Index. décimale : 667.9 Revêtements et enduits Résumé : Liquid crystalline polymers are polymers having a partially ordered state of the molecules. The orientation of the molecules along the flow direction is responsible for their lower viscosities, making them suitable for high solid coatings. Such polymers also exhibit a combination of excellent hardness and flexibility. The methods of synthesis of various types of resins such as acrylic, alkyd, polyester and epoxy has been reviewed along with the different techniques for their characterization. Advantages of liquid crystalline polymers over their amorphous counterparts has been discussed. Guidelines have been provided for formulating liquid crystalline acrylic copolymers for both baking as well as nonbaking applications. Note de contenu : - Classification of liquid crystalline polymers : Arrangement of the molecules in the mesophase – Transition to mesophase – Position of the mesogenic moiety in the polymer molecule - Synthesis of liquid crystalline of polymers : - Liquid crystalline acrylic polymers – Liquid crystalline alkyd polymers, polyester polymer and oligoester diols – Liquid crystalline epoxy polymers - Characterisation of liquid crystalline polymer - Advantages of liquid crystalline polymers - Guidelines for designing of liquid crystalline polymers Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12579 [article]

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Low molecular weight acrylic resins through change in the mode of initiator addition : a novel route of synthesis / Nishant N. Prabhu in PAINTINDIA, Vol. LIII, N° 8 (08/2003)

[article]  inPAINTINDIA > Vol. LIII, N° 8 (08/2003) . - p. 33-46 Titre : Low molecular weight acrylic resins through change in the mode of initiator addition : a novel route of synthesis Type de document : texte imprimé Auteurs : Nishant N. Prabhu, Auteur ; C. Suryanarayana, Auteur Année de publication : 2003 Article en page(s) : p. 33-46 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : High temperature processing, higher initiator dose, use of chain transfer agent and slower monomer addition are the commonly used techniques for getting low molecular weight acrylic resin in drip-feed process. An alternate route was evaluated wherein the initiator was added in the reactor either partly or completely prior to monomer addition. Nine different resins with same monomer compositions were synthesized, one resin as a control, four resins by using each of the above four routes for getting lower molecular weight than control and four by adding part or whole of the initiator in the reactor. The viscosity, percent solids, molecular weight distribution and free monomer content of these acrylic resins and the properties of the film obtained by curing these resins with an amino resin were compared. For initiator having higher half life at the processing temperature, the new route gave resin with lowest viscosity when all the initiator was added in the reactor. The performance of this resin was found comparable to the resins of similar molecular weight obtained by using the other available routes. The study showed that in case of initiator having lower half life at the processing temperature, optimization of ratio of splitting the initiator between reactor and initiator mix is required. Note de contenu : - Characterization of the acrylic resins – Paint processing and characterization – Crosslinking and characterization of coating films Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12161 [article]

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Modeling of molecular weight of acrylic resins using full factorial techniques / Nishant N. Prabhu in PAINTINDIA, Vol. LIX, N° 4 (04/2009)

[article]  inPAINTINDIA > Vol. LIX, N° 4 (04/2009) . - p. 53-64 Titre : Modeling of molecular weight of acrylic resins using full factorial techniques Type de document : texte imprimé Auteurs : Nishant N. Prabhu, Auteur ; Deepak Shanbhag, Auteur Année de publication : 2009 Article en page(s) : p. 53-64 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Initiator half life at the processing temperature, initiator concentration and monomer feed rate are the factors governing the molecular weight and the viscosity properties of an acrylic resin in "drip-feed" process. Contribution of each of these factors on the molecular weight of the polymer was determined using full factorial analysis. Twelve resin batches were processed as per the statistical design of experiments. The molecular weight distribution of these acrylic resins were recorded by GPC. The data was analysed by full factorial analysis. A mathematical equation was obtained correlating the molecular weight of the polymer with the levels which these three parameters are set during the processing. Using this mathematical equation, the molecular wight was predicted for a batch where these parameters were set at particular values. The batch was processed and its molecular weight was determined by GPC. The observed value was found to be in good agreement with the value predicted by the equation. Thus, this statistical tool can be used for predicting the molecular weight of the polymer from the set parameters. The parameters can now be set based on other consideration such as energy consumption, cost of formulation and cycle time and molecular weight can be predicted using the equation. The parameters can be further finetuned using the equation to get desired molecular weight thus eliminating the requirement of processing of large number of batches. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6788 [article]

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