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Article Dans Une Revue European Polymer Journal Année : 2014

Investigations on interactions between titanium alkoxides and alpha,omega-dihydroxy PDMS by a combination of rheology and spectroscopy

Résumé

The phenomena involved in the reactions between alpha-omega-dihydroxy PDMS and titanium tetraalkoxides, Ti(OR)(4), were investigated by a combination of rheology and spectroscopy (NMR, IR). The increase of viscosity observed mainly originates from a linear chain extension of PDMS chains by formation of Ti-O-Si bonds. This is mainly related to an apparent functionality of 2 of Ti(OR)(4). The products formed evolve with time and are sensitive to hydrolysis due to the poor stability of Ti-O Si bonds. The precise understanding of the reactions involved raises interesting perspectives for the crosslinking of alpha-omega-dihydroxy PDMS and Si(OR)(4) derivatives using titanium tetraalkoxide based catalysts.

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Dates et versions

hal-01087621 , version 1 (26-11-2014)

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Laura Comaills-Autin, Philippe Cassagnau, Anne Seggio, Aurélie Mondiere, Roger Spitz, et al.. Investigations on interactions between titanium alkoxides and alpha,omega-dihydroxy PDMS by a combination of rheology and spectroscopy. European Polymer Journal, 2014, 57, pp.37-46. ⟨10.1016/j.eurpolymj.2014.05.002⟩. ⟨hal-01087621⟩
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