Investigation of Reaction Rate of Bis(triethoxysilylpropyl)tetrasulphide in Silica-Filled Compound Using Pyrolysis-Gas Chromatography/Mass Spectrometry

Formation of a strong 3-dimensional interfacial network structure via chemical reaction between hydroxyl group on silica surface and NR chain by the addition of bis(triethoxysilylpropyl)tetrasulfide (TESPT) into silica-filled NR compound was observed by using Py-GC/MS and SEM. Addition of TESPT into silica-filled NR compound decreased scorch time (t 10 ) due to increased sulfur content, and reduced cure rate index (CRI) via continuous reaction between sulfur atoms in TESPT, which acted as a sulfur donor, and activators and/or accelerators. Addition of TESPT in the compound improved processability and mechanical properties of the compound. Overall, we observed that the addition of TESPT into the silica-filled NR compound formed a silica-TESPT-NR network, and thus the degree of crosslinking was increased resulting in improved mechanical properties.

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Study on Mixing Condition of the Rubber Composite Containing Functionalized S-SBR, Silica and Silane : II. Effect of Mixing Temperature and Time

Jang¹,

Kim²,

Kang³

et al. 2013

Elastomers and Composites

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ABSTRACT：The properties of the rubber composites containing a silane and silica were evaluated by changing the mixing time and temperature, in order to find the optimum mixing conditions. Characteristics of the compounds were evaluated after mixing at 120 ℃, 140 ℃, and 160 ℃ with various mixing time. With increasing of mixing time, mooney viscosity decreased while the bound rubber contents of the compounds increased. Viscosity rise by increased mixing time was bigger at low temperature and the higher the mixing temperature the faster in the formation of bound rubber. With lower mixing temperature of 120 ℃, cross-linking rate was almost constant. Dynamic viscoelastic properties and dispersity of the compound showed that dispersion of ingredients and reaction was not sufficient with the mixing time of less than 10min. On the contrary, with high temperature, it was obvious that good dynamic and physical properties could be obtained due to sufficient coupling reaction, however it was thought this high temperature is not optimum because of sensitive cross-linking rate and physical properties and excessive formation of bound rubber. Consequently, it was confirmed that the mixing condition of 10min at 140 ℃ was optimum for the silane coupling reaction and dispersion of functionalized S-SBR containing silica and silane.

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Investigation of Reaction Rate of Bis(triethoxysilylpropyl)tetrasulphide in Silica-Filled Compound Using Pyrolysis-Gas Chromatography/Mass Spectrometry

Cited by 4 publications

References 18 publications

The effect of silane addition timing on mixing processability and properties of silica reinforced rubber compound

The effect of silane addition timing on mixing processability and properties of silica reinforced rubber compound

Observation of Interfacial Adhesion in Silica-NR Compound by Using Bifunctional Silane Coupling Agent

Study on Mixing Condition of the Rubber Composite Containing Functionalized S-SBR, Silica and Silane : II. Effect of Mixing Temperature and Time

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