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Thin film of poly(propylene fumarate) (PPF) postcrosslinking. Thin films of PPF in various weight ratios with diethyl fumarate (DEF) were formed from 120 μL of polymer between 2×2 cm glass slides. Polymer crosslinking was initiated with 5 mg/g of bis(2,4,6-trimethylbenzoyl) phenylphosphine oxide (BAPO), under UVa light (3.5 mW/cm2) for 90 min. Resulting thin films were 0.25 mm thick and weighed 0.15 g. The image shows a thin film composed of 2 g PPF to 1 g DEF (2:1).
