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. 2009 Sep 11;14(9):3551–3566. doi: 10.3390/molecules14093551

Figure 4.

Figure 4

FT-IR spectra of acetylated cellulose samples prepared at different reaction times: 5 min (spectrum 1, sample 13), 20 min (spectrum 2, sample 15), 30 min (spectrum 4, sample 17), 40 min (spectrum 3, sample 18).