Properties of Starch/PVA Blend Films Containing Citric Acid as Additive |
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| Authors: | Hye-Ryoung?Park Sung-Hyo?Chough Yeon-Hum?Yun Email author" target="_blank">Soon-Do?YoonEmail author |
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| Institution: | (1) Faculty of Applied Chemical Engineering, Chonnam National University, 300 Yongbong-dong, 500-757 Buk-gu, Kwangju, South Korea;(2) Department of Mineral & Energy Resources Engineering, Chonnam National University, 300 Yongbong-dong, 500-757 Buk-gu, Kwangju, South Korea;(3) Department of Applied Chemical Engineering, Chonnam National University, 300 Yongbong-dong, 500-757 Buk-gu, Kwangju, South Korea |
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| Abstract: | Starch/polyvinyl alcohol (PVA) blend films were prepared successfully by using starch, polyvinyl alcohol (PVA), glycerol (GL) sorbitol (SO) and citric acid (CA) for the mixing process. The influence of mixing time, additional materials and drying temperature of films on the properties of the films was investigated. With increase in mixing time, the tensile strength (TS), elongation (%E), degree of swelling (DS) and solubility (S) of the film were equilibrated. The equilibrium for TS, %E, DS and S value was 20.12 MPa, 36.98%, 2.4 and 0.19, respectively. The mixing time of equilibrium was 50 min. TS, %E, DS and S of starch/PVA blend film were examined adding glycerol (GL), sorbitol (SO) and citric acid (CA) as additives. At all measurement results, except for DS, the film adding CA was better than GL or SO because hydrogen bonding at the presence of CA with hydroxyl group and carboxyl group increased the inter/intramolecular interaction between starch, PVA and additives. Citric acid improves the properties of starch/PVA blend film compared to glycerol and sobitol. When the film was dried at low temperature, the properties of the films were clearly improved because the hydrogen bonding was activated at low temperature. |
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| Keywords: | Starch/PVA blend film mechanical properties degree of swelling solubility citric acid |
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