Synthèse et propriétés d'oligomères dièniques partiellement et totalement hydrogénés |
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Authors: | Yves Camberlin Jean Gol Jean Pierre Pascault Jean Pierre Durand Franois Dawans |
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Institution: | Yves Camberlin,Jean Golé,Jean Pierre Pascault,Jean Pierre Durand,François Dawans |
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Abstract: | Hydrogenations of several hydroxy-terminated low molecular weight polybutadienes (PB) or non functional PB and one polyisoprene by homogeneous catalysis were studied. Hydrogenation of 1,4-polybutadienes gave solid crystalline polymers. In the case of hydrogenated 1,2-polymers a decrease of the glass transition temperature was noted, the hydrogenation leading to amorphous polymers. The rheological behaviour of oligomers was found to be Newtonian at low shear rates (≤ 100 s?1). The viscosity at Tg+100°C increased in every case with the hydrogenation rate. It was found that hydrogen bonding induced by hydroxyl groups has a great effect on the glass transition temperature but does not change the viscosity at Tg + 100°C. |
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