Waveguide compositions and waveguides formed therefrom

A flexible optical waveguide, comprising a core and a clad, wherein the core and/or the clad are formed from a composition comprising:

• a polymer, comprising:
• units of the formula (R1SiO1.5) and (R22SiO), wherein R1 and R2 are the same or different, and are substituted or unsubstituted organic groups, and wherein the (R22SiO) units are present in an amount of 14 wt % or more based on the polymer;
• and
• a plurality of functional end and/or internal groups;
• and
• a component for altering the solubility of the composition upon activation,
• wherein the solubility of the composition in a dried state is alterable upon activation of the component such that the composition is developable in an aqueous developer solution.

A method of forming a flexible optical waveguide comprising a core and a clad, the method comprising:

• (a) forming a layer over a substrate from a composition comprising:
• a polymer, comprising:
• units of the formula (R1SiO1.5) and (R22SiO), wherein R1 and R2 are the same or different, and are substituted or unsubstituted organic groups, and wherein the (R22SiO) units are present in an amount of 14 wt % or more baed on the polymer;
• and
• a plurality of functional end and/or internal groups;
• and
• a component for altering the solubility of the composition upon activation,
• wherein the solubility of the composition in a dried state is alterable upon activation of the component such that the composition is developable in an aqueous developer solution;
• and
• (b) activating at least a portion of the layer,
• wherein the layer is a core or a clad layer.