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FTIR spectra of the pristine sodium alginate and PEG-40S used, and the resultant alginate–PEG and alginate–PEG–phospholipid porous films obtained (alginate, PEG-40S, alginate–PEG-40S, and alginate–PEG-40S and phospholipid are denoted by ALG, PEG, ALG–PEG, and ALG–PEG–Lipid, respectively).
