Communication science et technologie
Volume 6, Numéro 1, Pages 85-90
2008-01-01
Natural Rubber:part I:an Overview
Auteurs : F. Riahi. . C. Bouremel .
Résumé
Before the advent of synthetic rubbers and for many decades Natural Rubber (NR) remained a general purpose elastomer used in various applications. However after the commercial success of Styrene Butadiene Styrene thermoplastic elastomers in the late seventies, Natural Rubber producers could not afJord not to follow this trend. Their concern was to face a virtual risk that the consumers would turn to synthetic rubbers in the event of Natural Rubber (NR) not being able to meet their needs or if NR is seen to crea te a kind of monopoly situation. It was believed that the only way to defend non-tire applications and insure continuous market out/ets for NR, was to develop highly technical grades which could not easily be substituted by synthetic rubbers. Many studies have therefore been conducted in order to chemically modify Natural Rubber in order to produce new forms or grades. Examples of such grades are cyclized NR, which is used in adhesive and printing ink formulations, and chlorinated NR, which compensates for the poor oil resistance, inflammability and adhesion to metal substrates of the mother elastomer. The first part of this paper discusses the structure and the properties of Natural rubber and outlines the different routes that were used in order to develop other grades through the chemical modification of the original elastomer. The second part will be devoted to an extensive review of the main published work concerning the particular form of modified Natural Rubber which is Thermoplastic Natural Rubber (TPNR). It is hoped that through this contribution, we make available to Algerian researchers from industry and academies, comprehensive material of interest to both scientists and technologists.
Mots clés
NR,synthetic rubbers
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