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Journal Article

Thermo-induced multistep assembly of double-hydrophilic block copolypeptoids in water

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Bogomolova,  Anna
Helmut Schlaad, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society;

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Secker,  Christian
Helmut Schlaad, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society;

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Citation

Bogomolova, A., Secker, C., Koetz, J., & Schlaad, H. (2017). Thermo-induced multistep assembly of double-hydrophilic block copolypeptoids in water. Colloid and Polymer Science, 295(8), 1305-1312. doi:10.1007/s00396-017-4044-6.


Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-2C59-E
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 Tcp∼30 and 45 °C and a clearing point in between at Tcl∼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.