Study on biodegradable plastic from sago with addition of glycerol and serbitor

Abstract

The synthesis of biodegradable plastic film was carried out by using sago starch as main raw material, water as solvent, glycerol and sorbitol as plasticizer. Sago was selected as raw material for plastics not only because it’s cheap and easy to obtain, but also the utilization of sago is still very minimal. The research aimed to make the environmental friendly plastic, and to be better than the conventional ones. Parameters plasticizer of the research were glycerol and sorbitol by 7%, 8% and 9% weight of total mass, and the weight ratio of sago starch and water were 1:5, 1:7 and 1:9. The characteristics of plastic film that tested were the test mechanical of characteristic (tensile and elongation) by electronic system Universal Testing Machines, the water adsorption test in accordance with put the film in water for 24 hours, and biodegradability test by buring in the ground. The results showed that the highest tensile strength was 0.363 kgf/cm2 from concentration of sorbitol 7% and ratio of sago starch and water 1:5. The other way, the highest elongation percent result obtained was 125% from concentration of glycerol 9% with ratio of sago starch and water 1:9. The lowest water adsorption test obtained was 11,11% from concentration 7% glycerol with ratio of sago starch and water 1:7 and the degradable process was performed in 9-12 days.

Effects of Biodegradation of Corn-Starch–Sodium-Alginate-Based Liquid Mulch Film on Soil Microbial Functions

“…Therefore, the mass ratio of glycerol to starch was chosen to be 0.5 to maintain the optimized conditions, considering the production cost. Glycerol is a commonly used plasticizer that can improve the flexibility of the mulch material by forming hydrogen bonds with starch molecules through hydroxyl groups, thus, changing the molecular structure of the starch [ 24 ].…”

“…Therefore, the mass ratio of glycerol to starch was chosen to be 0.5 to maintain the optimized conditions, considering the production cost. Glycerol is a commonly used plasticizer that can improve the flexibility of the mulch material by 6 of 14 forming hydrogen bonds with starch molecules through hydroxyl groups, thus, changing the molecular structure of the starch [24]. As shown in Figure 2a, the elongation at break and tensile strength of the mulch film exhibited a trend of increasing and then decreasing with the addition of sodium alginate.…”

The Heat Resistant Capabilities of Bioplastic Composites on Sago Hampas Starch-Al2O3

“…Starch can be obtained from tubers, seeds, nuts, and the trunks of sago trees. Several studies have used cassava starch, sago starch, a mixture of durian seed starch and sago starch, jackfruit seed starch, and other starch sources as the main ingredients for bioplastics (Wahyuningtyas and Suryanto, 2017;Amni et al, 2019).…”

Sustainable specialized village-based sago (Metroxylon sago Rottb) management direction in Jayapura Regency

“…In Malaysia, sago has been developed as a material for liquid sugar, seasoning (monosodium glutamate), noodle, caramel, sago pearls, cracker, and even adhesive industries. Sago starch serves as the acetone-butanol-ethanol substrate [2]. It is also used as the basic material of plastic [3].…”

“…Cost TC = FC + VC, where TC = Total cost (Rp/year), FC = Fixed cost (Rp/year), VC = Variable cost (Rp/year) ……………………………………………………………………(1)Business Revenue Pd = TR -TC, where Pd = Farmers' revenue (Rp/year), TR = Total revenue (Rp/year), TC = Total cost (Rp/year) ……………………………………………………………… (2). …”