Water absorption and its effect on the tensile properties of tapioca starch/polyvinyl alcohol bioplastics

H. Judawisastra, Ramona Sitohang, L. Marta, Mardiyati

Research output: Contribution to journalArticleAcademicpeer-review

6 Citations (Scopus)
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Abstract

Tapioca is one of the largest sources of starch and makes it suitable to be used for bioplastic material. Addition of polyvinyl alcohol (PVA) has been shown to successfully reduce the brittleness of starch bioplastic. This study aims to investigate the influence of PVA addition to water absorption behavior and its effect on the tensile properties of tapioca starch/PVA bioplastics, which are still not yet fully understood until now. The bioplastics were prepared by solution casting method at gelatinization temperature, with PVA addition from 0 to 29 wt%. Examinations were carried out by means of water absorption test, tensile test and Fourier Transform Infrared (FTIR) Spectroscopy. Increasing content of PVA, up to 29 wt%, was found to decrease the water absorption of the bioplastics, with the lowest water saturation point of 251%. This is due to the interaction between starch and PVA which reduces the free OH groups in the resulting bioplastics. Consequently, this led to a decrease in water absorption-related deterioration, i.e. tensile properties degradation of the bioplastics. The addition of 29 wt% resulted into the lowest degradation in tensile strength (6%) and stiffness (30%), while accompanied with the highest elongation increase (39%) after water immersion.

Original languageEnglish
Article number012066
JournalIOP Conference Series: Materials Science and Engineering
Volume223
Issue number1
DOIs
Publication statusPublished - 5 Aug 2017

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Polyvinyl Alcohol
Polyvinyl alcohols
Water absorption
Starch
Tensile properties
Degradation
Water
Brittleness
Fourier transform infrared spectroscopy
Deterioration
Elongation
Casting
Tensile strength
Stiffness

Cite this

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title = "Water absorption and its effect on the tensile properties of tapioca starch/polyvinyl alcohol bioplastics",
abstract = "Tapioca is one of the largest sources of starch and makes it suitable to be used for bioplastic material. Addition of polyvinyl alcohol (PVA) has been shown to successfully reduce the brittleness of starch bioplastic. This study aims to investigate the influence of PVA addition to water absorption behavior and its effect on the tensile properties of tapioca starch/PVA bioplastics, which are still not yet fully understood until now. The bioplastics were prepared by solution casting method at gelatinization temperature, with PVA addition from 0 to 29 wt{\%}. Examinations were carried out by means of water absorption test, tensile test and Fourier Transform Infrared (FTIR) Spectroscopy. Increasing content of PVA, up to 29 wt{\%}, was found to decrease the water absorption of the bioplastics, with the lowest water saturation point of 251{\%}. This is due to the interaction between starch and PVA which reduces the free OH groups in the resulting bioplastics. Consequently, this led to a decrease in water absorption-related deterioration, i.e. tensile properties degradation of the bioplastics. The addition of 29 wt{\%} resulted into the lowest degradation in tensile strength (6{\%}) and stiffness (30{\%}), while accompanied with the highest elongation increase (39{\%}) after water immersion.",
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Water absorption and its effect on the tensile properties of tapioca starch/polyvinyl alcohol bioplastics. / Judawisastra, H.; Sitohang, Ramona ; Marta, L.; Mardiyati.

In: IOP Conference Series: Materials Science and Engineering, Vol. 223, No. 1, 012066, 05.08.2017.

Research output: Contribution to journalArticleAcademicpeer-review

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