[C:1]([O:11][CH:12]([CH3:14])[CH3:13])(=[O:10])/[CH:2]=[CH:3]/[C:4]([O:6][CH:7]([CH3:9])[CH3:8])=[O:5].[C:15]([OH:25])(=[O:24])[CH:16]=[CH:17][C:18]1[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=1.CO>O1CCCC1.C(OOC(C)(C)C)(=O)C(C)(C)C>[C:4]([O:6][CH:7]([CH3:9])[CH3:8])(=[O:5])/[CH:3]=[CH:2]/[C:1]([O:11][CH:12]([CH3:14])[CH3:13])=[O:10].[C:15]([OH:25])(=[O:24])[CH:16]=[CH:17][C:18]1[CH:19]=[CH:20][CH:21]=[CH:22][CH:23]=1A glass ampule having a volume of 75 mL was charged with 50 g (0.25 mol) of diisopropyl fumarate, 6.5 g (0.044 mol) of cinnamic acid and 0.32 g (0.0018 mol) of tert-butyl peroxypivalate as a polymerization initiator and after repeating purging with nitrogen and release of the pressure, sealed in the pressure-reduced state. This ampule was placed in a constant temperature bath at 50° C. and held for 48 hours, thereby performing radical polymerization. After the completion of polymerization reaction, the polymerization product was taken out of the ampule and dissolved in 400 g of tetrahydrofuran. The resulting polymer solution was added dropwise, for precipitation, to 3 L of methanol, and the precipitate was vacuum-dried at 80° C. for 10 hours to obtain 19 g of a diisopropyl fumarate/cinnamic acid copolymer (yield: 34%).
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