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Rigidification of Poly(p‑phenylene)s through ortho-Phenyl Substitution

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journal contribution
posted on 23.06.2020, 19:03 by Anna Baun, Zuyuan Wang, Svenja Morsbach, Zijie Qiu, Akimitsu Narita, George Fytas, Klaus Müllen
A sterically π-congested ortho-phenylated poly­(p-phenylene) (PPP) has been synthesized with unprecedentedly high molecular weights up to 29 kDa after fractionation, as confirmed by gel permeation chromatography coupled with a multiangle laser light scattering detector. The chain translation diffusion coefficient obtained from dynamic light scattering experiments displayed strong scaling (∼Lw–0.8) to the chain contour length, indicating a rodlike shape with remarkably high rigidity of this novel PPP. These results provide an interesting insight into the relationship between the structure and the chain stiffness of PPP-based polymers and challenge the validity of the existing diffusion models in polymer physics.