Hermansyah, Hermansyah (2021) Synthesis and characterization of chitosan linked by methylene bridge and Schiff base of 4,4-diaminophenyl ether-vanilin (Peer Review). Fakultas MIPA, Universitas Sriwijaya, Unsri. (Unpublished)
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Abstract
he synthesis chitosan-methylene bridge-Schiff base of 4,4-diaminodiphenyl ether-vanillin using casting method has been done. The aims of this research were modification chitosan with Schiff base of 4,4-diaminodiphenyl ether-vanillin, formaldehyde and its characterization using FTIR spectroscopy, SEM analysis, 1H–NMR and X-Ray Diffraction analysis. The first step was a synthesis of modified chitosan between chitosan and Schiff base of 4,4-diaminodiphenyl ether-vanillin. The second step was chitosan modified Schiff base of 4,4-diaminodiphenyl ether-vanillin then reacted with formaldehyde through casting method. The result showed that chitosan can be modified with Schiff base of 4,4-diaminodiphenyl ether-vanillin and formaldehyde and this modified chitosan can be linked by methylene bridge (–NH–CH2–NH–) and had azomethine group (–C=N–). The functional group of –C=N in modified chitosan before and after adding formaldehyde appeared at a constant wavenumber of 1597 cm–1. The functional group C–N in methylene bridge detected at 1388 and 1496 cm–1. The chitosan-Schiff base of 4,4-diaminodiphenyl ether-vanillin and Chitosan-methylene bridge-Schiff base of 4,4-diaminodiphenyl ether- vanillin had index crystalline (%)16.04 and 25.76, respectively. The chemical sift of signal proton azomethine group (–C=N–) in modified chitosan detected at 8.44–8.48 and 9.77 ppm. Proton from methylene bridge in modified chitosan appeared at 4.97–4.99 and 3.75 ppm. Surface morphology chitosan-methylene bridge-Schiff base of 4,4-diaminodiphenylether-vanillin had dense surfaces, mostly uniform and regular in shape. Keywords: chitosan; methylene bridge; Schiff base
| Item Type: | Other |
|---|---|
| Subjects: | Q Science > QD Chemistry > QD1-999 Chemistry |
| Divisions: | 08-Faculty of Mathematics and Natural Science > 47201-Chemistry (S1) |
| Depositing User: | Hermansyah Hermansyah |
| Date Deposited: | 28 Aug 2020 04:14 |
| Last Modified: | 17 Sep 2021 15:26 |
| URI: | http://repository.unsri.ac.id/id/eprint/33872 |
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