Siloxane-containing polymer matrices as coating materials / M. Zielecka in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 4, N° 3 (09/2007)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 4, N° 3 (09/2007) . - p. 275-281 Titre : Siloxane-containing polymer matrices as coating materials Type de document : texte imprimé Auteurs : M. Zielecka, Auteur ; K. Bajdor, Auteur ; E. Bujnowska, Auteur Année de publication : 2007 Article en page(s) : p. 275-281 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Matériaux poreux Revêtements protecteurs Silicones Les 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 : Coating materials based on siloxane-containing polymer matrices that had been modified with fluoropolymer or acrylic resins and applied as organic components of hybrid systems were examined. The optimal recipes of the dispersion systems, applied as polymer matrix precursors, were determined on the basis of factorial experiments, designed as 22 with additional ‘star’ experimental points to obtain greater accuracy in the resulting regression equations. The siloxane cage formation was based on the following crosslinking reactions of functional polysiloxanes: (1) hydrosilylation of vinyl groups; (2) condensation of silanol groups. Moreover, the molecular modeling, using P3 semi-empirical methods, was applied to build the model structure of a siloxane-containing polymer matrix. The surface properties of these coatings were studied using wettability assessments (dynamic contact angle and surface-free energy evaluation), atomic force microscopy (AFM), and X-ray electron microscopy (ESCA-XPS). The morphology, roughness, and structural regularity are discussed to illustrate the effects of the organic component on the surface properties. The most significant changes were observed in the surface morphology of the coatings. The application properties of such coating materials for the protection of buildings were tested, based on studies of their water vapor permeability, water absorption, and weathering resistance (freezing/thawing, salt-saturated aqueous sodium sulfate solution). The effect of the chemical structure of the siloxane-containing polymer matrix on the properties of the resulting coatings was focused on the protection of porous building materials. A very good correlation of the application properties of these coating materials and their surface properties, such as high dynamic contact angle (DCA), low surface-free energy (SFE) and surface morphology, was observed and is discussed. DOI : 10.1007/s11998-007-9028-x En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-007-9028-x.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3642 [article]

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Studies on the effect of structural parameters on the properties of polysiloxaneurethane dispersions and coatings / J. Kozakiewicz in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS, Vol. 89, B1 (03/2006)  

[article]  inSURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS > Vol. 89, B1 (03/2006) . - p. 31-39 Titre : Studies on the effect of structural parameters on the properties of polysiloxaneurethane dispersions and coatings Type de document : texte imprimé Auteurs : J. Kozakiewicz, Auteur ; A. Koncka-Foland, Auteur ; J. Skarzynski, Auteur ; J. W. Sobczak, Auteur ; M. Zielecka, Auteur Année de publication : 2006 Article en page(s) : p. 31-39 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adhésion Copolymère uréthane acrylique Dispersions et suspensions Dureté (matériaux) Résistance à l'humidité:Résistance à l'eau Résistance chimique Revêtements -- Analyse Revêtements -- Propriétés mécaniques Revêtements organiques Transition vitreuse Index. décimale : 667.9 Revêtements et enduits Résumé : The results of studies on the effect of introducing double bonds and siloxane segments to the polyurethaneurea chain on the properties of polyurethane and polyurethane-acrylic/styrene dispersions and coatings are presented. In order to investigate that effect a 23 factorial experiment was designed and conducted. Several properties of dispersions, coatings and films were determined, including,inter alia, particle size, stability, and MFFT (minimum film-forming temperatures) of dispersions, hardness, resistance to water and solvents, adhesion of coatings and mechanical properties, and the glass-transition temperature (Tg) of films. Properties of coatings and films subjected to additional curing were also investigated. Analysing the results of the factorial experiment helped to better understand the mutual effect of several factors on the properties of the investigated materials. ESCA (electron spectroscopy for chemical analysis) and DCA (dynamic contact angle) studies of the surface properties of the coatings were also carried out. Note de contenu : - EXPERIMENTAL : Dispersion synthesis - Formation of coatings and films - Testing of dispersons, coatings and films - Testing of surface properties of coatings - Design of factorial - Analysis of factorial experiment results - Effect of polymer structure - related factors (XI, X2 and X3) on the properties of polysiloxane urethane-acrlic/styrene dispersions - Effect of polymer structure - related factors (X1, X2 and X3) on the properties of films made from polysiloxane urethane-acrylic/styrene dispersions - Effect of structural parameters and of additional curing by a curing (polyaziridine) and by UV on the surface properties of coatings made from polysiloxane urethane and polysiloxane urethane-acrylic/styrene dispersions - Table 1 : Selected results of properties of dispersions, coatings and films determined for products of single experiments that constituted the factorial experiment - Table 2 : Effect of additional curing on surface properties of coatings prepared from starting polysiloxaneurethane dispersion (DPU-PJ 441) and polysiloxaneurethaneacrylic~styrene dispersion (PUM 442) obtained from DPU-PJ 441 after polymerisation of acrylic~styrene monomers in it - results of ESCA analysis (Si/N atoms ratio) and DCA determination of the coatings (ACA = advancing contact angle, RCA = receding contact angle) - Table 3 : Effect of distance from the coating surface on siloxane segments content (Si/N ratio) in the polymer determined by ESCA for coatings obtained from polysiloxaneurethane (DPU-PJ 441) and polysiloxaneurethane-acryliclstyrene (PUM 442) dispersions DOI : 10.1007/BF02699612 En ligne : https://link.springer.com/content/pdf/10.1007/BF02699612.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5393 [article]

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