Thermal behavior of partially hydrogenated polydienes by <Emphasis Type="Italic">p</Emphasis>-toluenesulfonylhydrazide |
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Authors: | C K Santin M M Jacobi R H Schuster M Santoso |
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Institution: | 1.Instituto de Química, Programa em Ciência dos Materiais,Universidade Federal do Rio Grande do Sul,Porto Alegre,Brazil;2.Deutsches Institut für Kautschuktechnologie e.v. (DIK),Hannover,Germany |
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Abstract: | The hydrogenation of natural rubber (NR), polybutadiene (BR), and styrene-butadiene (SBR) rubbers with different microstructures
was performed by a diimide hydrogenation agent generated in situ by a non-catalytic method 1–3]. Many properties of the material depend considerably on variables such as degree of hydrogenation and proportions of vinyl
or phenyl units. The mobility of the hydrogenated chain was investigated by differential scanning calorimetry (DSC) and the
results confirm the relationship between the degree of hydrogenation and chain flexibility. The flexibility of a high cis-1,4 BR hydrogenated sample, was significantly changed and a melting point (T
m) was detected after a certain degree of hydrogenation. Thermal stability was investigated by thermogravimetric analysis (TG)
and an increase was found, but, the thermal resistance was influenced by the presence of the byproduct p-toluenesulfinic acid. Oxidation stability was investigated by chemiluminescence analysis and it improved with hydrogenation. |
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