Polymer materials

A method for indicating pH at a locus, comprising:

• introducing a locus to a polyurethane network comprising a hydrophilic copolymer comprising an ionizable moiety, the ionizable moiety configured such that ionization of the moiety affects a hydrophilic state of the hydrophilic copolymer, the hydrophilic copolymer comprising an acrylol group and an indicator monomer that provides an indication of the hydrophilic state of the hydrophilic copolymer;
• and
• detecting the pH of the locus based on the indicator monomer.

A device for indicating pH at a locus, comprising:

• a polyurethane network comprising a hydrophilic copolymer having an ionizable moiety, the ionizable moiety configured such that ionization of the moiety affects a hydrophilic state of the hydrophilic copolymer;
• and
• wherein the hydrophilic copolymer comprises an indicator monomer and a hydrophilic monomer selected from the group consisting of an acrylamide, an acrylate, and an acrylic acid, wherein the indicator monomer is configured to provide an indication of the hydrophilic state of the hydrophilic copolymer, the hydrophilic state indicative of changes in pH at the locus.

A device for indicating pH at a locus, comprising:

• a polyurethane network comprising a hydrophilic copolymer having an ionizable moiety selected from the group consisting of acrylic acid, methacrylic acid, or sulphonic acid, the ionizable moiety configured such that ionization of the moiety affects a hydrophilic state of the hydrophilic copolymer;
• and
• wherein the hydrophilic copolymer comprises an indicator monomer and an acrylol group, the indicator monomer configured to provide an indication of the hydrophilic state of the hydrophilic copolymer, the hydrophilic state indicative of changes in pH at the locus.