Dehydration, Micellization, and Phase Separation of Thermosensitive Polyoxazoline Star Block Copolymers in Aqueous Solution | Zendy

Tetiana Sezonenko | Zendy; XingPing Qiu | Zendy; Françoise M. Winnik | Zendy; Takahiro Sato | Zendy

Open Access

Dehydration, Micellization, and Phase Separation of Thermosensitive Polyoxazoline Star Block Copolymers in Aqueous Solution

Author(s) -

Tetiana Sezonenko,

XingPing Qiu,

Françoise M. Winnik,

Takahiro Sato

Publication year - 2019

Publication title -

macromolecules

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.994

H-Index - 313

eISSN - 1520-5835

pISSN - 0024-9297

DOI - 10.1021/acs.macromol.8b02528

Subject(s) - copolymer , cloud point , polymer chemistry , micelle , small angle x ray scattering , polymer , materials science , core (optical fiber) , hydrodynamic radius , turbidimetry , chemistry , phase (matter) , aqueous solution , chemical engineering , scattering , organic chemistry , chromatography , physics , optics , composite material , engineering

Suitably end-functionalized diblock copolymers (2-isopropyl-2-oxazoline)-b-(2-ethyl-2-oxazoline) (PIPOZ-b-PEOZ) were linked to a tetrafunctional core to synthesize two isomeric thermosensitive 4-arm star block polymers which have the PIPOZ block near the core, core-(PIPOZ-b-PEOZ)4, or near the outer surface the star polymer, core-(PEOZ-b-PIPOZ)4. The solution properties of the star copolymers in water were monitored by turbidimetry, microcalorimetry, and small-angle X-ray scattering (SAXS). The dehydration and cloud-point temperatures of both core-(PIPOZ-b-PEOZ)4 and core-(PEOZ-b-PIPOZ)4 in water are in the vicinity of 50 °C. Above this temperature, core-(PIPOZ-b-PEOZ)4 forms starlike aggregates or star micelle, whereas core-(PEOZ-b-PIPOZ)4 remains isolated, with no sign of aggregation. These results demonstrate the importance of chain architecture on the association of thermosensitive tetra-arm star block copolymers in water above the dehydration temperature.

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