METHODS

Additional experimental details including materials and measurements, full synthetic details accompanied with molecular characterization data, structural characterization, absorption and emission spectra, and theoretical simulations are available in the supplementary data.

Light-Activated TCP Methods. Monomers (∼10 mg) were thermally pressed onto a quartz substrate (5 cm × 5 cm) at a temperature above its clearing point, then cooled to specified temperature (e.g. 75°C) to form a thin film. The film was annealed at this temperature for 10 min and then placed under a 365 nm UV lamp until the film became colorless and nearly transparent, yielding the polymer product. The resulting polymer was either peeled from the substrate as a solid or dissolved in an appropriate solvent (e.g. CDCl3, tetrahydrofuran) prior to characterization.