[CH:1]([N:3]1[CH2:7][CH2:6][CH2:5][C:4]1=[O:8])=[CH2:2].C(N1CCCC1=O)=C.[C:17]([O:22][CH2:23][CH2:24]OC(=O)C(C)=C)(=[O:21])[C:18](C)=C.C(N1CCCC1=O)=C.C(OCCCCCCCCCCCC)(=O)C(C)=C>C1CCCCC1.C(OOC(=O)CCCCCCCCCCC)(=O)CCCCCCCCCCC>[CH:1]([N:3]1[CH2:7][CH2:6][CH2:5][C:4]1=[O:8])=[CH2:2].[C:17]([O:22][CH:23]=[CH2:24])(=[O:21])[CH3:18]An uncrosslinked vinylpyrrolidone (VP) homopolymer, a crosslinked 98/2 weight ratio vinylpyrrolidone/ethylene glycol dimethacrylate (VP/EGDM)copolymer, an uncrosslinked 70/30 weight ratio vinylpyrrolidone/lauryl methacrylate (VP/LM) copolymer and an uncrosslinked 79/21 weight ratio vinylpyrrolidone/vinyl acetate (VP/VA) copolymer were prepared by solution polymerization in cyclohexane using lauroyl peroxide as catalyst. The viscous reaction mixture was cast on a polytetrafluoroethylene sheet and the solvent was permitted to evaporate. The resultant thin film was dried at 60° C. in a forced air oven, washed free of residual monomer, if any, with petroleum ether and redried in vacuo at 60° C.
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