Hollow polymer particles that are pH-responsive and redox sensitive: two simple steps to triggered particle swelling, gelation and disassembly.

A new, simple, two-step method is introduced for preparing hollow particles that are both pH-responsive and redox sensitive. Hollow poly(methyl methacrylate-co-methacrylic acid) particles swell at moderate pH values, form gels in concentrated dispersions and can be disassembled by adding reducing agents.