Thermo-induced multistep assembly of double-hydrophilic block copolypeptoids in water
- 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 A degrees C is studied. Turbidimetric analyses of the 0.1 wt% aqueous solutions reveal two cloud points at T (cp)similar to 30 and 45 A degrees C and a clearing point in between at T (cl)similar to 42 A degrees 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.
Author details: | Anna Bogomolova, Christian Secker, Joachim KoetzORCiDGND, Helmut SchlaadORCiDGND |
---|---|
DOI: | https://doi.org/10.1007/s00396-017-4044-6 |
ISSN: | 0303-402X |
ISSN: | 1435-1536 |
Title of parent work (English): | Colloid and polymer science : official journal of the Kolloid-Gesellschaft |
Publisher: | Springer |
Place of publishing: | New York |
Publication type: | Article |
Language: | English |
Year of first publication: | 2017 |
Publication year: | 2017 |
Release date: | 2020/04/20 |
Tag: | Block copolymers; Polypeptoids; Self-assembly; Thermoresponsive |
Volume: | 295 |
Number of pages: | 8 |
First page: | 1305 |
Last Page: | 1312 |
Funding institution: | Max Planck Society; University of Potsdam |
Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Chemie |
Peer review: | Referiert |