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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Polymer surface tension and properties of state
 Jůza, Josef
This contribution presents transformation of some well-known equations expressing surface tension using state properties and other parameters to express the ratio of the surface tension to the drop density, which is more reliable and available even if density is unknown.
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Impact of weathering on chemical and morphological changes in stabilized polymers
 Pospíšil, Jan ; Pilař, Jan ; Billingham, N. C. ; Marek, Antonín ; Kruliš, Zdeněk ; Nešpůrek, Stanislav ; Habicher, W. D.
Photooxidation, considered as the principal component of natural and accelerated weathering, affects together with oxygen,oxidizing and acid atmospheric pollutants durability of stabilized polymers by changing their chemical and supramolecular structure and influencing efficiency of stabilizers. Effects of the harshness of accelerated photooxidation, negative influences of atmospheric pollutants, heterogeneity in polymer oxidation together with formation of concentration gradients in stabilizer consumption and spatial distribution of stabilizer sacrificial transformation products are outlined. The data give more information on processes accompanying testing of stabilizer polymers and help to minimize misleading influences from over-accelerated tests.
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