All-Dry Fabrication of Poly(methacrylic acid)-Based Membranes with Controlled Dissolution Behavior

The all‐dry fabrication of porous poly(methacrylic acid)‐based membranes displaying tunable dissolution behaviors in aqueous media is presented. Poly(methacrylic acid) (PMAA) membranes were fabricated using a low temperature, solventless technique with gaseous initiator and monomer precursors. The PMAA was then converted to poly(methacrylic acid‐co‐methacrylic anhydride) by thermal annealing. By controlling the annealing time, the methacrylic anhydride (MAN) content was varied, which allowed for the dissolution behavior to be tuned. The incorporation of MAN moieties in the membranes also allowed for crosslinking via a vapor phase reaction with 1,3‐diaminopropane. The membranes can be deposited on a variety of substrates, including gauze. Porous poly(methacrylic acid)‐based membranes are produced by chemical vapor deposition and thermal annealing. The chemical functionality of the membranes is tailored in order to tune the dissolution behavior in aqueous media from pH‐dependent dissolution to full insolubility.