Word Count : 137

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Two commonly used polycarboxylic acids that behave as pH-responsive polymers are poly(acrylic acid) (PAA) and poly(methacrylic acid) (PMAA). These polymers contain pendant carboxyl (-COOH) groups that can ionize depending on the pH of the _________ _______ _____ ____ ______ _________ ________ _____ _________ ________.
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