Date of Award

1-1-2001

Thesis Type

Masters

Document Type

Thesis

Divisions

Institute for Advanced Studies

Department

-

Institution

Universiti Malaya

Abstract

The use of polyethylene glycol (PEG) to modify the surface of precipitated silica by means of physical adsorption was investigated. The effects of adding PEG on processing, cure and physical properties of a silica-carbon black-filled natural rubber truck tread compound were examined. For each series of investigation, two sets of experiments were conducted. Set I was to check the effects of both physical adsorption due to PEG and chemical modification due to a silane coupling agent, Si-69 on the surface of silica. Set 2 was to check the effects of physical adsorption due to PEG alone on the surface of silica. A carbon black-filled compound without silica, Si-69 and PEG was taken as the control sample. Addition of PEG led to significant reduction in both cure time and scorch time and faster cure rate. This is due to the prevention of accelerator adsorption on the silica surface by PEG. The following physical properties were affected by the addition of PEG: Storage modulus of the compounds with Si-69 were reduced Cut growth resistance of compounds with Si-69 were reduced Tear strength of the compounds with Si-69 were improved Abrasion resistance of the compounds with or without Si-69 were slightly better.

Initial

snms

Additional Information

Dissertation (M.A) -- Institute for Advanced Studies, Universiti Malaya, 2001.

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