Abstract
The aqueous solution behavior of thermoresponsive-hydrophilic block copolypeptoids, i.e., poly(N-(n-propyl)glycine) x -block-poly(N-methylglycine) y (x = 70; y = 23, 42, 76), in the temperature range of 20–45 °C is studied. Turbidimetric analyses of the 0.1 wt% aqueous solutions reveal two cloud points at T cp∼30 and 45 °C and a clearing point in between at T cl∼42 °C. Temperature-dependent dynamic light scattering (DLS) suggest that right above the first collapse temperature, single polymer molecules assemble into large structures which upon further heating, i.e., at the clearing point temperature, disassemble into micelle-like structures. Upon further heating, the aggregates start to grow again in size, as recognized by the second cloud point, through a crystallization process.
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Acknowledgements
Antje Völkel (AUC), Sibylle Rüstig (TEM), and Sascha Prentzel are thanked for their contributions to this work. Financial support was given by the Max Planck Society and the University of Potsdam.
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Bogomolova, A., Secker, C., Koetz, J. et al. Thermo-induced multistep assembly of double-hydrophilic block copolypeptoids in water. Colloid Polym Sci 295, 1305–1312 (2017). https://doi.org/10.1007/s00396-017-4044-6
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DOI: https://doi.org/10.1007/s00396-017-4044-6