Abstract
New poly(ester ether)urethanes containing biocide chloramphenicol in the hard segments are presented. SEM microphotographs evidence highly porous morphologies which depend on the nature of polyether segments. The self-assembly ability in micellar aggregates was evidenced by TEM and DLS analyses. Critical micelle concentration values determined by steady-state fluorescence measurements tend to increase with more solvophilic poly(ethylene oxide) and β-cyclodextrin segments. The flow curves reveal shear thinning (pseudoplastic behavior) followed by Newtonian plateaus for all studied polyurethane solutions. The complex viscosity reveals shear thinning behavior at low values of angular frequency followed by shear thickening behavior at higher values of angular frequency. The rheological temperature test evidences an Arrhenius thermothinning behavior at low temperatures followed by thermothickening behavior at higher temperatures. The studied polyurethanes have thermoresponsive and thermoassociative properties.
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Acknowledgements
This work was supported by a grant of Ministry of Research and Innovation, CNCS—UEFISCDI, project number PN-III-P4-ID-PCCF-2016-0050, within PNCDI III.
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Doina Macocinschi and Daniela Filip: Conceptualization, Polyurethane preparation and characterization (DSC and SEM analyses); Constanta Ibanescu and Maricel Danu: Rheology measurements and Writing – original data on the Rheology results; Liviu Sacarescu: TEM analysis and interpretation: Mirela-Fernanda Zaltariov: Writing- Original draft preparation, Visualization, Investigation and Supervision, Funding acquisition and Project administration.
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Zaltariov, MF., Filip, D., Macocinschi, D. et al. Self-assembly and rheological behavior of chloramphenicol-based poly(ester ether)urethanes. J Polym Res 28, 190 (2021). https://doi.org/10.1007/s10965-021-02545-7
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DOI: https://doi.org/10.1007/s10965-021-02545-7