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    Université de Fribourg

    Telechelics based on catalytic alternating ring-opening metathesis polymerization

    Pal, Subhajit ; Alizadeh, Mahshid ; Kilbinger, Andreas F. M.

    In: ACS Macro Letters, 2019, vol. 8, no. 10, p. 1396–1401

    We describe a protocol to synthesize alternating telechelic ROMP copolymers of 7- oxa-norbornene derivatives and cycloalkenes under catalytic conditions. These copolymers were synthesized using Grubbs’ second-generation catalyst. The sterically less hindered backbone double bonds of the resulting alternating copolymers facilitate the chain transfer (secondary metathesis) reactions. In the ...

    Université de Fribourg

    Towards polymers with molecular auxeticity

    Alizadeh, Mahshid ; Tennie, Iris K. ; Steiner, Ullrich ; Kilbinger, Andreas F. M.

    In: CHIMIA International Journal for Chemistry, 2019, vol. 73, no. 1, p. 25–28

    For many decades, it has been challenging to synthesize auxetic materials at the molecular level. Auxetic materials exhibit counterintuitive behavior; they expand perpendicularly to the direction in which they are stretched. An aromatic macrocycle containing a sequence of N-substituted and N-unsubstituted amides was designed to resemble the re-entrant structure found in macromolecular auxetic...

    Université de Fribourg

    Synthesis of telechelic poly(p-benzamide)s

    Alizadeh, Mahshid ; Kilbinger, Andreas F. M.

    In: Macromolecules, 2018, vol. 51, no. 11, p. 4363–4369

    Well-defined telechelic poly(benzamide)s were synthesized by chain-growth polycondensation of phenyl-4-amino benzoate and pentafluorophenyl-4-amino benzoate derivatives with a bifunctional initiator in the presence of LiTMP as base. The polymerization was carried out at −70 °C to prevent self-initiated polymerization. To confirm the control over molecular weight, different defined...