Abstract: This research
investigated the utilization
of sorghum starch
and chitosan as
basic material for preparation of
biodegradble plastic. The
optimum conditions for
the formation of
biodegradble plastic and the
effect of starch-chitosan formulation
on mechanical properties
of the biodegradable plastic
were studied. The
experiments were conducted
by varying concentration sorbitol as
plasticizer (i.e. 20%,
25%, 30%, and 40%
dry weight), ratio
starch to chitosan
(i.e. 6:4, 7:3, 8:2,
9:1, 10:0 g/g)
and at ranging
gelatinuous temperature of
65-95oC. The results showed that
the optimum conditions
were obtained at starch:chitosan mass
comparison of 7:3 and sorbitol
concentration of 20%.
The mechanical properties
of the biodegradable
plastic produced at gelatinuous
temperature of 95oC were: tensile
strength of 6,9711 Mpa,
elongation percentage of 16,48, modulus young of 42,48 Mpa, and water
resistance of 36,825%.
Keywords: bioplastic,
chitosan, plasticizer, sorgum, sorbitol
Penulis: Yuli Darni, Herti
Utami
Kode Jurnal: jpkimiadd090020
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