Bestimmung der Haftzugfestigkeit dichter Beschichtungen / Determination of bond strength of impermeable polymer coatings

1999 ◽  
Vol 5 (4) ◽  
pp. 387-398
Author(s):  
R.M. Frey ◽  
F.H. Wittmann
Keyword(s):  
Bond Strength ◽  
Polymer Coatings ◽  
Theoretical Background ◽  
Gas Pressure ◽  
Blister Formation ◽  
Controlled Conditions ◽  
Porous Substrates

Abstract In many cases there is a risk for the formation of blisters if impermeable polymer coatings are applied on porous substrates. On covers of courses in sport stadiums formation of blisters has been observed recently. In this contribution a method is described which can be used to investigate the causes of blister formation in a given system. Blisters are artificially created by the application of a gas pressure in the interface between coating and substrate. In this way the growth of blisters can be varied under controlled conditions. The theoretical background of this method is outlined. In this way it is possible to estimate the necessary pressure under the cover to create blisters of the observed size.

scholarly journals Spectroscopic Determination of an Anion−π Bond Strength

2019 ◽  
Vol 141 (15) ◽  
pp. 6132-6135 ◽  
Author(s):  
Cate S. Anstöter ◽  
Joshua P. Rogers ◽  
Jan R. R. Verlet
Keyword(s):  
Bond Strength ◽  
Spectroscopic Determination

scholarly journals Evaluation of Usefulness of the Designed Laboratory Photobioreactor for Microalgae Cultivation in Controlled Conditions

2016 ◽  
Vol 20 (1) ◽  
pp. 13-22
Author(s):  
Beata Brzychczyk ◽  
Zbigniew Kowalczyk ◽  
Jan Giełżecki
Keyword(s):  
Culture Medium ◽  
Dry Mass ◽  
Biomass Growth ◽  
Microalgae Cultivation ◽  
Freshwater Microalgae ◽  
Laboratory Conditions ◽  
Medium Concentration ◽  
Controlled Conditions ◽  
The Impact

AbstractThe objective of the paper was to analyse the use of the designed photobioreactor for freshwater microalgae cultivation in the controlled laboratory conditions. The work covered the design and construction of photobioreactors (PBR) and setting up comparative cultivations of freshwater microalgae chlorelli vulgaris along with determination of the biomass growth intensity for a varied amount of supplied culture medium. It was found out that the constructed PBR may be used for microalgae cultivation in the controlled conditions. The impact of the culture medium amount on the growth of chlorelli vulgaris was proved. As a result of the increase of culture medium concentration to 30.1-120.4 ml·l−1 of water, dry mass in photobioreactorsincreased respectively from 1.33 g·dm−3 to 4.68 g·dm−3.

Studies of the Flame Spraying of Polymers

1996 ◽  
Author(s):  
D.J. Varacalle ◽  
K.W. Couch ◽  
V.S. Budinger
Keyword(s):  
Bond Strength ◽  
Combustion Process ◽  
Experimental Studies ◽  
Polymer Coatings ◽  
Flame Spraying ◽  
Knoop Microhardness ◽  
Resultant Coating ◽  
Strength Characterization ◽  
Thermally Sprayed

Abstract Experimental studies of the subsonic combustion process have been conducted in order to determine the quality and economics of polyester, epoxy, urethane, and hybrid polyester-epoxy coatings. Thermally sprayed polymer coatings are of interest to several industries for anti-corrosion applications, including the infrastructural, chemical, automotive, and aircraft industries. Classical experiments were conducted, from which a substantial range of thermal processing conditions and their effect on the resultant coating were obtained. The coatings were characterized and evaluated by a number of techniques, including Knoop microhardness tests, optical metallography, image analysis, and bond strength. Characterization of the coatings yielded thickness, bond strength, hardness, and porosity.

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