Resumen de Preparation and properties of different functional group containing styrene butadiene rubber
Chemically modified styrene butadiene rubber (SBR) with nitro and chloro functionalities are prepared by the nitromercuration reaction of SBR through a phase transfer catalyst. Activation energy for this chemical reaction calculated from the time temperature data on the chemical reaction by the measurement of percentage of chlorine indicated that the reaction proceeded according to fist order kinetics. The chemical modification is characterized by FTIR, UV, NMR studies reveal the attachment functional group such as nitro and chloro group to the double bond of butadiene moiety. The glass transition temperature of the functionalized SBR is analyzed using differential scarming calorimetry. Thermogravimetric analysis (TGA) of the modified SBR is investigated in orderto study the basic decomposition pattern and thermal stability of the materials. Chemical modification of SBR is accompanied by a reduction of double bond which imparts excellent tensile strength. The fíame resistances of the modified samples are analyzed by the limiting oxygenindex value (LOI) and the result of the studies show that as the level modification increases the tendency of ealstomeric material to burn decreases.
