Synthesis and characterization of temperature‐ and pH‐sensitive poly(N,N‐diethylacrylamide‐co‐methacrylic acid)

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A series of pH‐ and temperature‐responsive (N,N‐diethylacrylamide‐co‐methacrylic acid) (DEAM–MAA) random copolymers were synthesized by free‐radical copolymerization techniques, and their lower critical solution temperatures (LCSTs) at different pH values and their critical phase‐transition pH values at different temperatures were determined by transmittance measurements, respectively. The LCSTs of DEAM–MAA copolymers depend on the MAA content in the copolymers and are significantly affected by the pH of the aqueous solution. Similarly, the critical phase‐transition pH values also depend on the MAA content of the DEAM–MAA copolymers and are significantly affected by the temperature of the aqueous solution. The LCST of DEAM–MAA copolymers increases with an increase in the MAA content. The critical phase‐transition pH increases with increasing MAA content in the copolymer and also increases with increasing aqueous solution temperature.