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Gelation of polyvinylbutyral solutions by the addition of tetrabutyl orthotitanate

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Abstract

This paper discusses the gelation of polyvinylbutyral (PVB) solutions by the addition of tetrabutyl orthotitanate. The addition of around 0.10 vol.% tetrabutyl orthotitanate to an ethanol-based PVB solution already causes a pronounced gelation. For the characterization of this gelation reaction, different rheological measurements are used. The characterization is mainly performed in the linear viscoelastic regime. Time sweeps prove the stability of the samples during the measuring time. Frequency sweeps are used to investigate the state of gelation after different reaction times as well as the dependence of the degree of the gelation on the tetrabutyl orthotitanate concentration. Furthermore, the gelation point is determined by measuring the loss factor tan δ as a function of frequency. A strong influence of water on the degree of gelation is shown; by the addition of different amounts of water, the gelation can be controlled or even avoided. Amplitude sweeps reveal the breakdown of certain network structures at high amplitudes which recover after the strain is lowered.

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Acknowledgments

Prof. Dr. F.J. Stadler, Shenzhen University, Shenzhen, Guangdong, China, is thanked for helpful discussions and the Deutsche Forschungsgemeinschaft (German Research Foundation) for the funding (Graduiertenkolleg 1161/1).

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Correspondence to Helmut Münstedt or Andreas Roosen.

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Wegener, M., Kaschta, J., Münstedt, H. et al. Gelation of polyvinylbutyral solutions by the addition of tetrabutyl orthotitanate. Rheol Acta 53, 635–643 (2014). https://doi.org/10.1007/s00397-014-0784-0

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  • DOI: https://doi.org/10.1007/s00397-014-0784-0

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