Open AccessStudy of starch, sugar blending effect on the biodegradability of (PVA) for packaging applications
Author(s) -
J H Nahida
Publication year - 2019
Publication title -
iraqi journal of physics
Language(s) - English
Resource type - Journals
eISSN - 2664-5548
pISSN - 2070-4003
DOI - 10.30723/ijp.v15i32.155
Subject(s) - starch , sugar , biodegradation , solubility , materials science , hydrogen bond , chemical engineering , fourier transform infrared spectroscopy , ultimate tensile strength , reducing sugar , polymer chemistry , food science , composite material , organic chemistry , chemistry , molecule , engineering
PVA, Starch/PVA, and Starch/PVA/sugar samples of differentconcentrations (10, 20, 30 and 40 % wt/wt) were prepared by castingmethod. DSC analysis was carried; the results showed only one glasstransition temperature (Tg) for the samples involved, which suggestthat starch/PVA and starch/PVA/sugar blends are miscible. Themiscibility is attributed to the hydrogen bonds between PVA andstarch. This is in a good agreement with (FTIR) results. Tg and Tmdecrease with starch and sugar content compared with that for(PVA). Systematic decrease in ultimate strength, due to starch andsugar ratio increase, is attributed to (PVA), which has more hydroxylgroups that made its ultimate strength higher than that forstarch/PVA, and starch/PVA/sugar blends. It is observed from wateruptake tests that the solubility time decreases with starch ratio; it isattributed to decrease in hydroxyl groups caused by PVA ratiodecrease. The inter- and inter-molecular bonds of the hydroxylgroups enhanced the solubility process of the starch/PVA blends inwater. The water immersion causes hydrogen bonds (inter andintermolecular bonds) to decompose, that increases the filmsolubility. Water absorption and capacity of degradability are mostimportant in biodegradable materials. The results suggest the samplesthat have undergone investigation, can be used for shopping, andfood packaging.The study of soil burial for the sample at (3cm) depth, and at (13cm)depth has exhibited weight loss increase with soil burial time. Thebiodegradability rapidly increases at the first (6-7) weeks; it is foundthat the weight loss at (3cm) depth is greater than that at (13cm) thatwas attributed to the differences in the availability of oxygen ratio. Itis found that PVA undergoes lowest weight loss, the weight losschanges with starch, and sugar content. In dry soil, the weight loss islower. The results proved that the biodegradation decreases with soilburial time after seven weeks of burial. It is concluded that thesamples involved are biodegradable material that can be used forpackaging applications and biologically friendly synthetic polymerblends to solve the solid waste accumulation problem.