Influence of Polymer Polarity and Association Strength on the Properties of Poly(alkyl ether)-Based Supramolecular Melts

• DOI: 10.1021/acs.macromol.2c01116
• Publication Date: 2022-11-14T10:05:42Z
• Authors: Ana Rita Brás; Ana Arizaga; Daria Sokolova; Uxue Agirre; Maria Teresa Viciosa; Aurel Radulescu; Sylvain François ...; Margarita Kruteva; Wim Pyckhout-Hintzen; Annette Monika Sc...
• Keywords: info:eu-repo/classification/ddc/540; 02 engineering and technology; ddc:no; 540; 0210 nano-technology

The present work focuses on the impact of polymer polarity and hydrogen-bonding (H-bonding) end groups association strength structure dynamics poly(alkyl ether)-based supramolecular model polymers studied by means small angle scattering (SAS), rheology, dielectric relaxation spectroscopy (DRS), differential scanning calorimetry (DSC). These consist poly(propylene oxide) (PPO) or poly(ethylene (PEO) backbone that self-assembly in bulk via hydrogen bonding (H-bonding). Diaminotriazine (DAT) thymine-1-acetic acid (THY) as well 2-ureido-4[1H]-pyrimidinone (UPY) are H-bonding choice. Both PPO PEO bearing either DAT THY associate into linear chains, but PPO-THY/DAT forms longer chains comparison with PEO-THY/DAT. lower results stronger associations for same groups. However, temperature dependence association/dissociation lifetimes this type is independent different main chain these breaking times do not exceed rouse expected within Cates model. PPO-UPY a transient network characterized interplay between bonds controlled characteristic pairs UPY involving probably just two ends, revealed similar spectra backbone, more stable bond phase separated clusters. latter responsible physical cross-links result rubbery-like plateau rheological spectra. has to PEO-UPY, validated scattering, detachment clusters PEO-UPY than PPO-UPY, though activation energies very close match typical energy barrier specifically imposed bonds. Moreover, while segmental glass transition (Tg) PPO, highest Tg value much slower compared based polymers. This seems indicate strongly influenced play fundamental role defining time scale process.