Structure–Property Relationships of Microphase-Separated Metallosupramolecular Polymers

• DOI: 10.1021/acs.macromol.0c00876
• Publication Date: 2020-07-01T21:35:55Z
• Authors: Laura N. Neumann; Ilja Gunkel; Amber Barron; Emad Oveisi; Albrecht Petzold; Thomas Thurn-Albr...; Stephen Schrettl; Christoph Weder
• Keywords: Perchlorate

The structural, thermomechanical, and viscoelastic properties of metallosupramolecular polymers (MSPs) can be controlled through the choice multiligand monomer nature metal salt from which these materials are assembled. This versatility dynamic certain metal–ligand (ML) complexes make MSPs very interesting for design stimuli-responsive materials. We here report on investigation structure–property relationships based a macromonomer formed by terminating telechelic poly(ethylene-co-butylene) (PEB) with 2,6-bis(1′-methylbenzimidazolyl)pyridine (Mebip) ligands transition or lanthanoid salts. ion (Zn2+, Fe2+, Tb3+, La3+, Gd3+), counterion (trifluoromethanesulfonate (OTf–), perchlorate (ClO4–), bis(trifluoromethylsulfonyl)imide (NTf2–)), number-average molecular weight (Mn) PEB core (2100 3100 g mol–1) were systematically varied aim to provide an improved understanding how parameters influence properties. In all MSPs, polar ML nonpolar found microphase separate into lamellar hexagonal morphologies soft phase hard phase. microstructure formation mechanical significantly influenced coordination geometry as well volume fraction counterions further affected glass melting transitions general, lower softening temperatures observed made Measurements frequency-dependent oscillatory shear moduli used study relaxation processes in different allowed determining activation energy lanthanoid-based MSPs.