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Article Dans Une Revue European Polymer Journal Année : 2022

Tuneable thermal properties of PTHF-based copolymers by incorporation of epoxide units

Résumé

In order to decrease the crystallinity of polytetrahydrofuran (PTHF), statistical copolymerizations with 1,2butylene oxide (BO) and 3,3-dimethyl-1,2-butylene oxide (DMBO) epoxides as comonomer were investigated in a process compatible with an easy scaling up. Difunctionnal poly(tetrahydrofuran-stat-1,2-butylene oxide)s (PTHF-stat-PBO) and poly(tetrahydrofuran-stat-3,3-dimethyl-1,2-butylene oxide)s (PTHF-stat-PDMBO) were synthesized in the range of 0-20 degrees C using different operating conditions. The reactivity ratios showed a homogeneous distribution of the epoxide units all along the copolymer chains by using BO, while an alternation of several THF and DMBO monomer units sequences was obtained in the DMBO-based copolymers. Still, both copolymerizations fit well with an ideal copolymerization behavior. A slow addition of BO during the propagation step or the introduction of BO or DMBO at the beginning of the polymerization were investigated. Whatever the comonomer used, its insertion in the polymer chain reduced the melting temperature of the copolymers and the impact of the THF polymerization equilibrium on the yields. As a consequence, higher polymerization yields were obtained. A fairly good control of the polymer molar masses was observed, although elimination reactions were highlighted. However, operating conditions were determined to limit the content of the resulting alkene chain ends to about 10%, providing guaranties for further macromolecular architectures developments.
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Dates et versions

hal-03927816 , version 1 (06-01-2023)

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Citer

Pauline Le Bellec, Patrick Midoux, Hervé Cheradame, Véronique Bennevault, Philippe Guégan. Tuneable thermal properties of PTHF-based copolymers by incorporation of epoxide units. European Polymer Journal, 2022, 168, pp.111096. ⟨10.1016/j.eurpolymj.2022.111096⟩. ⟨hal-03927816⟩
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