Influence of chemical curatives on the reaction between sulphur in silane and rubber phases in natural rubber/polybutadiene blend reinforced with a silanised silica nanofiller

Zainudin Umar, . and Ali Ansarifar, . Influence of chemical curatives on the reaction between sulphur in silane and rubber phases in natural rubber/polybutadiene blend reinforced with a silanised silica nanofiller. pp. 234-256. ISSN 1511-1768

This study prepared a natural rubber/polybutadiene (NR/BR: 50/50 wt) blend using precipitated amorphous white silica filler the surface of which had been pre-treated with bis-(3-triethoxysilylpropyl)-tetrasulphane (TESPT). TESPT is a sulphur-bearing bifunctional organosilane which chemically bonds silica to rubber via the sulphur to form strong rubber-silica interaction. The rubbers were primarily cured by using sulphur in TESPT and the cure was optimised by adding sulphenamide accelerator zinc oxide activator and elemental sulphur. The chemical bonding between the sulphur in TESPT and the rubbers was affected mainly by the addition of the chemical curatives. In the absence of full chemical bonding between the sulphur in TESPT and the rubbers most of the mechanical properties of the blend were inferior. But when chemical bonds or crosslinks fully formed between the sulphur in TESPT and the rubbers the tensile strength elongation at break stored energy density at break tear energy cyclic fatigue life and abrasion resistance were enhanced. For example the cyclic fatigue life of the blend increased by almost 50 000 times which was a major improvement.

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Abstract

This study prepared a natural rubber/polybutadiene (NR/BR: 50/50 wt) blend using precipitated amorphous white silica filler the surface of which had been pre-treated with bis-(3-triethoxysilylpropyl)-tetrasulphane (TESPT). TESPT is a sulphur-bearing bifunctional organosilane which chemically bonds silica to rubber via the sulphur to form strong rubber-silica interaction. The rubbers were primarily cured by using sulphur in TESPT and the cure was optimised by adding sulphenamide accelerator zinc oxide activator and elemental sulphur. The chemical bonding between the sulphur in TESPT and the rubbers was affected mainly by the addition of the chemical curatives. In the absence of full chemical bonding between the sulphur in TESPT and the rubbers most of the mechanical properties of the blend were inferior. But when chemical bonds or crosslinks fully formed between the sulphur in TESPT and the rubbers the tensile strength elongation at break stored energy density at break tear energy cyclic fatigue life and abrasion resistance were enhanced. For example the cyclic fatigue life of the blend increased by almost 50 000 times which was a major improvement.

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Item Type:	Article
AGROVOC Term:	Sulphur
AGROVOC Term:	Natural rubber
AGROVOC Term:	Silica
AGROVOC Term:	Tensile strength
AGROVOC Term:	Cross-linking
AGROVOC Term:	Mechanical properties
AGROVOC Term:	Stearic acid
AGROVOC Term:	Density
AGROVOC Term:	Hardness
AGROVOC Term:	Blending
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:28
URI:	http://webagris.upm.edu.my/id/eprint/22946

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