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SURFACTANT/SILANE/SILICA

INTERFACE/INTERPHASE

[S(CH2)3Si(OR)3]2

H

  • O

    Si

O

H2O

  • O

    Si

O

  • O

    O

O

The silica silane interactions are complicated by both dispersion of the silica, silane hydrolysis, and silanol condensation reaction of the silane with itself and with the filler and then with the sulfur entering into the rubber vulcanization chemistry. In this model we propose the selection of surfactant technology can influence the surface interface at the silica. By using different chain lengths and polar end groups the interaction with polar surfaces of silica and with the silane (or silanol formed during mixing) can be modified. In essence the process additive serves as a surface emulsifier in a non polar matrix. This thin layer, which probably is about a nano layer thick, prevents the silica particles from dewetting from the polymer during storage. It also can be chosen to influence some of the silane chemistry. The result is a good over balance of physical properties with greatly improved processing effects. This model is simplified to leave out the rubber, the pores in the silica particles, and the vulcanization chemicals and reactions that take place during the vulcanization process. The Struktol JV 46F has both the ability to change the interface chemistry but also to influence the interphase chemical interactions which leads to better vulcanization chemistry.

STP0260

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