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1.
Colloid and Polymer Science - Heats of immersion in waterH i W and in benzeneH i B (in joules per gramme) of four silica fillers, modified by some silane coupling agents capable of forming... 相似文献
2.
Surface modification of highly dispersed rubber fillers and pigments by titanate proadhesive and hydrophobic compounds 总被引:1,自引:0,他引:1
A method of modifying silicate and carbonate fillers with titanate coupling agents and proadhesive agents was worked out. The modification aimed at hydrophobization of filler surface by introduction to the surface of functional groups with chemical affinity to polymers. Optimum amounts of modifying substances and appropriate conditions for performing the modification process were established. The obtained fillers showed a high degree of hydrophobicity.The modified fillers were applied in rubber mixtures based on butadienestyrene or natural rubber, in polyurethanes, in PVC, and as pigments in oil dyes of high corossive resistance. 相似文献
3.
Teofil Jesionowski Andrzej Krysztafkiewicz 《Journal of Dispersion Science and Technology》2013,34(6):1609-1623
Silicas were obtained using a precipitation technique from metasilicate solution with an acidic agent. The precipitation process includes formation of silica particles and their aggregation. Alcohol solutions were used in the production process of the highly dispersed silicas, resulting in a partial blocking of the silica surface silanol groups and, thus, in a decreased hydrophilicity of silica. The precipitated silicas were subjected to physicochemical, structural, and microscopic evaluation, and their surface properties were examined. The effect of alcohols on the silica particle size distributions and on hydrophobicity of silica surface was tested. 相似文献
4.
Effect of amorphous precipitated silica on the properties and structure of poly(p-phenylene sulfide)
T. Jesionowski K. Bula J. Jurga A. Krysztafkiewicz 《Colloid and polymer science》2001,279(10):983-989
Using a precipitation technique, silicas were obtained from sodium metasilicate solution employing an acidic agent. Alcohol
solutions were used in the process of production of highly dispersed silicas, which resulted in partial blocking of the silica
surface silanol groups. Moreover, studies on morphology and microstructure using transmission electron microscopy and scanning
electron microscopy were performed. The size distributions of primary particles and aggregate and agglomerate structures were
determined using a ZetaPlus instrument using the dynamic light scattering method. The structure and molecular dynamics of
the nanocomposite, consisting of poly (p-phenylene sulfide) (PPS) and of the precipitated silica, were studied using atomic force microscopy and nuclear magnetic
resonance. It was proved that during annealing the fragmentation of PPS agglomerates takes place. This phenomena probably
resulted from repulsion forces existing between agglomerates and aggregates. Fragmentation in the polymer network probably
resulted from repulsion forces between agglomerates and smaller aggregates.
Received: 7 November 2000 Accepted: 5 April 2001 相似文献
5.
Methods of estimating the degree of condensation of the surface silanol groups of silica due to its modification by silane coupling agents are reported.Also, a procedure for estimating the surface silanol groups for the pre- and post-modified silicas for the NIR 7326 cm–1 band is given.Using electron microscope studies and heats of immersion of silica surfaces, the silane effect on agglomeration of silica particles and, thus, on the physicochemical properties of its surface has been demonstrated. 相似文献
6.
Studies were performed on application of highly dispersed silicas, specially obtained in organic solvent medium, to processing of elastomers. Particular attention was paid to silica surface modification and to estimation of an extent of the surface modification. To this aim, near infrared techniques were used and heat effects associated with surface wetting with water and benzene were estimated. Application studies were also conducted on the use of modified silicas in butadiene-styrene rubber. 相似文献
7.
Results have been presented from studies on physico-chemical properties of precipitated silicas, their modification with silanes and the suitability of such precipitated silicas as polyurethane fillers. Effect of unmodified and modified fillers on the course of synthesis and chosen physico-mechanical properties of urethan elastomers have been described. 相似文献
8.
Michał Wieczorek Andrzej Krysztafkiewicz Teofil Jesionowski 《Macromolecular Symposia》2003,194(1):345-350
Comparative analysis was performed of local bentonites of SPECJAL EXTRA U and IZOL types, produced by Zakłady Górniczo-Metalowe Zębiec, and of LT type bentonite, produced by Rheox company. Principal physicochemical properties of the bentonites were established, including bulk density, capacities to absorb water, dibutyl phthalate and paraffin oil and their sedimentation rates in water, xylene and gasoline were estimated. Bentonite morphology was examined using scanning electron microscope (SEM). Moreover, particle size distribution, BET surface area and zeta potential were determined. 相似文献
9.
We present a new modification method to additonally micronize talcs to a particle diameter of 0.8 m using silane and titanate coupling agents, thus allowing an increase of acitvity against elastomers. It appears that the silane modification proceeds in greater extent when acid medium is used. After the modifications, the wettability of talcs in water and benzene was measured by the calorimetric technique. A direct correlation between heats of immersionh
i
W
andh
i
B
of silane (titanate) surface coverage has also been found. 相似文献
10.
A. Krysztafkiewicz B. Rager M. Maik J. Szymanowski 《Colloid and polymer science》1994,272(12):1526-1535
Results of studies are presented on effect of new model compounds, applied to modify precipitated silica, on reinforcing of butadiene-styrene rubber vulcanizates filled with modified silica. Precipitated silica applied for the pur pose has been obtained according to our own procedure. Estimation of heats of immersion, mainly in benzene, has documented effect of model compounds involving hydrophobization of silica surface.For comparative reasons, results of strength tests have also been presented on vulcanizates of butadiene-styrene rubber filled with silica modified with a recognized coupling agent-mercaptosilane A-189. 相似文献