Oligomers (400 mg) were dissolved in 4 ml of DCM. Photoinitiators (Irgacure 819, Irgacure 651, and Irgacure 2959) were dissolved in DCM (10 mg/ml) and added to the dissolved oligomers in the appropriate proportions. Irgacure 819 and Irgacure 651 were added at 1.5 weight % (wt %) (6 mg, 600 μl) and 1 wt % (4 mg, 400 μl). Irgacure 2959 was added for multiple exposure experiments at 1 wt % (4 mg, 400 μl). The dissolved resin was then deposited onto a Rain-X–coated glass at 160°C on a hotplate and allowed the DCM to evaporate open to air (30 min) with occasional stirring. The resin was then pressed between two Rain-X–coated glass plates with 500-, 250-, or 140-μm plastic spacers and heated to 160°C on a hotplate for 5 min to erase residual stress. Photopolymerization was then performed at 110°C on a hotplate (±10°C measured with a thermocouple) with 400- to 500-nm (50 mW/cm2) light (Exfo Acticure Hg Bulb) for 3 min. The resulting slightly yellow polymer network had a slight haze, confirming a polydomain structure. Thermal cycling led to a minimal shape change.

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