Study on the effect of modified and unmodified silica on the properties of natural rubber vulcanizates

Abstract

In the article, the effects of silica (silicon oxide) on some properties of natural rubber (NR) were studied. Silica used are unmodified (SiKBT) and modified with triethoxi silane propyl tetrasunfite (SiBT). It is shown SiBT increases vulcanization network density (VND), so it enhances strength and elastic properties of NR. In contrary, SiKBT decreases VND and reduces, but has almost no effect on strength of NR. Silica, both modified and unmodified, are assumed to improve network regularity of NR that change thermal degradation behavior of materials and keep the strength of NR-SiKBT compound unchanged.

Mullins Effect and Crack Growth in Natural Rubber Vulcanizates during Heat Aging and Cyclic Loading

“…All chemicals are technical grades from China. Rubber mixtures were prepared according to Table 1 as in our previous article [6].…”

Review: Natural rubber – Improvement of properties

“…Silica modification with TESPT continue to be studied until now. [76][77][78][79][80][81][82][83][84] TESPT enhances silica dispersion and rubberfiller interaction. TESPT modified silica raise rubber network density, improves cure characteristics, [78][79][80][81][82][83][84] mechanical properties [78,79,87] or thermal behavior.…”

“…[81] It was shown TESPT modified silica may ameliorate regularity of filled NR network, [81,85] that leads to the fact that bimodal distribution of NR molecules is blurred, and temperature of beginning destruction of material rise 6 o C than that of NR. [81] However, if TESPT content in modified silica is too high, curing characteristic of filled rubber as well as reinforcement effect of silica may decrease. It is because excess TESPT may form polysiloxane clusters on surface of silica particles, which are able to adsorb a part of accelerator in rubber compound.…”

“…[76][77][78][79][80][81][82][83][84] TESPT enhances silica dispersion and rubberfiller interaction. TESPT modified silica raise rubber network density, improves cure characteristics, [78][79][80][81][82][83][84] mechanical properties [78,79,87] or thermal behavior. [81] It was shown TESPT modified silica may ameliorate regularity of filled NR network, [81,85] that leads to the fact that bimodal distribution of NR molecules is blurred, and temperature of beginning destruction of material rise 6 o C than that of NR.…”

“…TESPT modified silica raise rubber network density, improves cure characteristics, [78][79][80][81][82][83][84] mechanical properties [78,79,87] or thermal behavior. [81] It was shown TESPT modified silica may ameliorate regularity of filled NR network, [81,85] that leads to the fact that bimodal distribution of NR molecules is blurred, and temperature of beginning destruction of material rise 6 o C than that of NR. [81] However, if TESPT content in modified silica is too high, curing characteristic of filled rubber as well as reinforcement effect of silica may decrease.…”