7. Hydrophobic and hydrophilic silica-filled cross-linked natural rubber (NR): structure and properties

Published Date
Chemistry, Manufacture and Applications of Natural Rubber
2014, Pages 193–198, 199e–210e, 199–215, doi:10.1533/9780857096913.1.193

• Author 

• A. Kato

• Y. Kokubo
• R. Tsushi
• Y. Ikeda

Abstract:

The optical characteristics of hydrophobic silica-filled cross-linked natural rubber (NR) samples were independent of the loading amount, whereas diffusion transmittance and haze of the hydrophilic silica-filled cross-linked NR samples showed peak values with silica content in the vicinity of 30 phr. The two types of silica have markedly different dispersion and aggregation structures in NR. Conventional TEM and 3D-TEM observation reveal that dispersion of the hydrophobic rubber is more homogeneous than hydrophilic and it is also interesting that the distance between the two perimeters of the silica aggregates of both silica converged to ca.1.3 nm. hydrophobic silica forms a network structure more readily than hydrophilic. The results of the study reveal that the optical properties of hydrophobic silica-filled cross-linked NR do not change markedly even if the silica loading is varied because isolated silica chains decrease sharply with increased silica content.

Key words

• hydrophobic silica
• hydrophilic silica
• silica-filled natural rubber
• network structure of particulate silica
• transparency
• haze

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 Table 7.1

Table 7.1.

Plate I.

Plate II.

Plate III.

Plate IV.

Plate V.

Plate VI.

Plate VII.

Plate VIII.

Plate IX.

Plate X.

Plate XI.

Plate XII.

Plate XIII.

Plate XIV.

Plate XV.

Plate XVI.

7.1.

7.2.

7.3.

7.4.

7.5.

7.6.

7.7.

7.8.

7.9.

7.10.

7.11.

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