Phase Separation of Aqueous Poly(diisopropylaminoethyl methacrylate) upon Heating | Zendy

Linda Salminen | Zendy; Erno Karjalainen | Zendy; Vladimir Aseyev | Zendy; Heikki Tenhu | Zendy

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Phase Separation of Aqueous Poly(diisopropylaminoethyl methacrylate) upon Heating

Author(s) -

Linda Salminen,

Erno Karjalainen,

Vladimir Aseyev,

Heikki Tenhu

Publication year - 2021

Publication title -

langmuir

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.042

H-Index - 333

eISSN - 1520-5827

pISSN - 0743-7463

DOI - 10.1021/acs.langmuir.1c02224

Subject(s) - methacrylate , copolymer , aqueous solution , counterion , phase (matter) , cloud point , micelle , polymer , polymer chemistry , ionic strength , chemical engineering , chemistry , ionic bonding , salt (chemistry) , materials science , organic chemistry , ion , engineering

Poly(diisopropylaminoethyl methacrylate) (PDPA) is a pH- and thermally responsive water-soluble polymer. This study deepens the understanding of its phase separation behavior upon heating. Phase separation upon heating was investigated in salt solutions of varying pH and ionic strength. The effect of the counterion on the phase transition upon heating is clearly demonstrated for chloride-, phosphate-, and citrate-anions. Phase separation did not occur in pure water. The buffer solutions exhibited similar cloud points, but phase separation occurred in different pH ranges and with different mechanisms. The solution behavior of a block copolymer comprising poly(dimethylaminoethyl methacrylate) (PDMAEMA) and PDPA was investigated. Since the PDMAEMA and PDPA blocks phase separate within different pH- and temperature ranges, the block copolymer forms micelle-like structures at high temperature or pH.

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