Comparisons among the Reinforcing Effects Provided by Various Silica-Based Fillers in a Siloxane Elastomer

摘要

The usual way of 'filling' an elastomer in order to reinforce it involves blending finely divided carbon black or silica into high molecular weight polymer prior to curing. In the case of the silica fillers, the surfaces are generally highly reactive and must usually be partially pre-reacted with a hydrophobic material to prevent premature gelation of the polymer. In any case, the techniques are relatively cumbersome, in part because of the high viscosities of the high molecular weight polymers typically employed. A variety of alternative techniques and modified fillers have recently come under investigation. Some have the potential of simplifying the process, or improving reinforcement capability. For example, it may be possible to improve the bonding to a commercial filler by using hydroxyl-terminated PDMS and tetraethoxysilane (TEOS). Reprints. (JES)