The dependence of pendulum hardness on the thickness of acrylic coating / Xiaoyang Ma in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 10, N° 3 (05/2013)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 10, N° 3 (05/2013) . - p. 433-439 Titre : The dependence of pendulum hardness on the thickness of acrylic coating Type de document : texte imprimé Auteurs : Xiaoyang Ma, Auteur ; Zemin Qiao, Auteur ; Zhifeng Huang, Auteur ; Xinli Jing, Auteur Année de publication : 2013 Article en page(s) : p. 433-439 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Couches épaisses Essai de dureté Polyacryliques Revêtements:Peinture Transition vitreuse Index. décimale : 667.9 Revêtements et enduits Résumé : Pendulum hardness, which is widely used in the characterization of organic coatings, depends greatly on the thickness of the coating. However, it is still unclear whether a qualitative or quantitative relationship exists between pendulum hardness and coating thickness. In the present article, the pendulum hardness values of acrylic coatings with different thicknesses are measured using a König pendulum hardness tester to clarify the dependence of pendulum hardness on thickness of coating. The results show that the pendulum hardness of acrylic coatings decreases gradually with the increasing thickness of coating within a thickness range, and the sensitivity of pendulum hardness to thickness of coating depends greatly on the glass transition temperature of the coatings. An equation suitable for describing the relationship between logarithmic decrement of the amplitude of pendulum's oscillation and thickness of coating is presented, which can separate the contributions of substrate and coating on the logarithmic decrement. This study demonstrates that the measured value of pendulum hardness is not the bulk hardness value for the coating but the representative value of the system consisting of substrate and coating. An excellent correlation between pendulum hardness and thickness of acrylic coatings is obtained, which is fairly supported by the experimental data. Note de contenu : - EXPERIMENTAL : Materials and equipment - Preparation of coatings with different thickness - The measurement of pendulum hardness - The measurement of glass transition temperature - RESULTS AND DISCUSSION : The calculation of logarithmic decrement of the amplitude of pendulum's oscillation - The relationship between logarithmic decrement and thickness of coating - The relationship between pendulum hardness and thickness of coating - Physical significance of pendulum hardness DOI : 10.1007/s11998-013-9477-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-013-9477-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18742 [article]

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