## Abstract Nous avons fait réagir, en présence de diphényl‐méthane diisocyanate et de butane diol (1,4), des oligomères α‐ω dihydroxylés du butadiène et de l'isoprène hydrogénés à différents taux. Les polyuréthannes segmentés ainsi obtenus ont fait l'objet d'études mécaniques dynamiques et statiqu
Synthèse et propriétés d'oligomères dièniques partiellement et totalement hydrogénés
✍ Scribed by Camberlin, Yves ;Golé, Jean ;Pascault, Jean Pierre ;Durand, Jean Pierre ;Dawans, François
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1979
- Weight
- 554 KB
- Volume
- 180
- Category
- Article
- ISSN
- 0025-116X
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✦ Synopsis
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 T~g~+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 T~g~ + 100°C.
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