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Dr. Yeong-Tarng Shieh, the Distinguished Professor of NUK developed a particular material contains tertiary amines
Dr. Yeong-Tarng Shieh, the Distinguished Professor of Department of Chemical and Materials Engineering of NUK recently presented a non-toxic, low-cost stimuli-responsive polymer contains tertiary amines and is expected to replace the traditional surfactant, and extensively applied in industrial, livelihood manufacturing.

Chitosan-g-poly [(2-dimethylamino) ethyl methacrylate] was investigated as a CO2-switchable emulsifier in this study. Poly (2-dimethylamino) ethyl methacrylate (PDMAEMA) was prepared by atom transfer radical polymerization followed by grafting to chitosan (CS).

The CO2-responsiveness and reversible CO2-switchable temperature- and pH-sensitive behavior of PDMAEMA and CS-g-PDMAEMA were investigated as emulsifiers via simple CO2 and N2 bubbling.

The lower critical solution temperatures (LCSTs) of PDMAEMA and CS-g-PDMAEMA aqueous solutions both increased as pH decreased to about pH 7.3, at which point the LCSTs disappeared. At elevated temperatures (e.g. 60 °C), CO2 bubbling removed the turbidity in CS-g-PDMAEMA aqueous solution and N2 bubbling restored turbidity.

The presence of CS-g-PDMAEMA in a two-phase solution of n-butanol/deionized water enabled the formation of a completely emulsified single phase after CO2 bubbling, which reverted to a two-phase solution on N2 bubbling. Overall, CS-g-PDMAEMA has potential as a CO2-switchable emulsifier
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