Wettability of silane films on silica fillers

Abstract

Heats of immersion in water/7,, vr and in benzene H, .~ (in joules per gramme) of four silica fillers, modified by some silane coupling agents capable of forming polisiloxane network, have been determined by using a calorimetric technique. The Hi w and Hp values as well as strength properties (tensile strength, 200% modulus) of the sulfur-cured SBR filled with the examined silicas are predominantly a function of specific surface of untreated filler and of content of a given silane deposited on the silica surface. A direct correlation between heats of immersion hi w and hp (in J/m 2) and silane surface coverage has been also found. Moreover the wettability parameters determined in water and benzene can be useful for evaluation of filler activity in elastomer reinforcement.

Adsorption of a Carboxylated Silane on Gold: Characterization for Its Rational Use in Hybrid Glass/Gold Substrates

“…Furthermore, the intensities of the bands of 3-APTMS spectra are more than 5× that of TMS-EDTA. These results confirm the multilayer formation of 3-APTMS on Au , and suggest that the amines are adsorbed onto the Au surface and the silane groups are directed away, resulting in extensive cross-linking. , …”

Modified precipitated silicas as polyurethane fillers

“…In the case of silica surface PU-i modification with aminosilane A-1100, a slowincrease pu-2 in H w values is observed in relation to the amounts of silane used while heat of immersion in benzene H• increases in a similar fashion with increasing concen-PU- 4 tration of silane, as is noted after modification with eu-5 mercaptosilanes. The increase in heats ofimmersion in pu-6 water for aminosilane-modified silicas has been explained [13,15]. The increase in the heat immersion eu-7 of silicas surface in benzene, observed after modifica-PU-8 tion with silanes, points to hydrophobic transformation of the surface, pu-9 PU-10 Table 3 lists polyurethane samples, subjected to kinetic studies and resistability testing.…”

“…Before introduction into the dispenser of the blender, the solutions were mixed carefully. The quantity of the methyl alcohol solution of silane was selected so that a uniform wetting of the filler surface [13] would proceed exclusively in the blender.…”

The modified talcs as semi-active fillers of rubbers

“…Methods of introducing silanes to the surface of silica fillers have been published earlier [3,8,9]. In contrast to the fillers talc shows a slight alkaline character in water and modification of the surface should be conducted in the presence of acidic agents, to improve condensation degree.…”