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All Journal Penelitian Pendidikan Jurnal Ilmu Dasar JURNAL PENDIDIKAN TAMBUSAI Eksakta : Berkala Ilmiah Bidang MIPA Pillar of Physics Education : Jurnal Berkala Ilmiah Pendidikan Fisika Pillar of Physics: Jurnal Berkala Ilmiah Fisika Phydagogic : Jurnal Fisika dan Pembelajarannya Journal of Civil Engineering and Vocational Education Journal of Experimental and Applied Physics
Riri Jonuarti
Universitas Negeri Padang
Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Social Sciences Transportation Other

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Journal : Journal of Civil Engineering and Vocational Education

 1 
Effect of Sorbitol and Chitosan Addition on Tensile Strength and Degradation Rate of Biodegradable Plastic from Rice Bran Starch Zahra, Hayatun Nufus; Jonuarti, Riri; Gusnedi, Gusnedi; Hidayat, Rahmat
CIVED Vol. 10 No. 3 (2023): September 2023
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/cived.v10i3.498

Abstract

The increasing use of plastic can cause enviromental pollution because plastic takes a very long time to decompose in the soil. Solutions that can be used to accelerate the process of plastic decomposition in the soil by replacing plastic making materials with natural polymer materials. Natural polymers are polymers produced from organic monomers, one of which is starch. Starch is one of the natural polymer materials used in the manufacture of biodegradable plastics, one of the natural materials containing starch is rice bran waste. From rice bran waste starch, bioderadable plastic can be made by adding chitosan and sorbitol by varying then succesively, namely 5:2:8, 5:3:7, 5:5:5, 5:7:3, 5:10:0, then making samples, then the samples are printed and tensile strength testing and degradation testing are carried out. From the tensile strength test results, the values obtained were 0.69 Mpa, 0.74 Mpa, 1.50 Mpa, 1.98 Mpa and 2.28 Mpa, respectively. The finel weight of the sampel after degradation is 0 gram, 0 gram, 0.0189 gram, 0.0226 gram, 0.1017 gram. It is concluded that biodegardable plastic with good tensile strength is in the variation of starch 5 grams, without sorbitol and chitosan 10 grams and for good degradation test in the variation of starch 5 grams, sorbitol 8 ml, chitosan 2 grams and variation of starch 5 grams, sorbitol 7 ml, chitosan 3 grams.
Effect of Polyvinyl Alcohol (PVA) Concentration and Stirring Time on The Mechanical Properties of Biodegradable Plastic from Kepok Banana Peel Starch Doni, Monica Anatasya; Jonuarti, Riri; Wulan, Ratna; Jhora, Fadhila Ulfa
CIVED Vol. 10 No. 3 (2023): September 2023
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/cived.v10i3.499

Abstract

One solution is to use bioplastics, which can replace synthetic plastics that are difficult to decompose. Starch is one of the materials used in the manufacture of bioplastics because it is naturally degradable. However, bioplastics made from starch tend to be brittle and easily damaged, so additional materials are needed to overcome this problem. Polyvinyl alcohol (PVA) is one of the materials used in the manufacture of bioplastics because it has properties that can be degraded naturally, is non-toxic, and is able to form good quality plastic films. This study aims to examine the effect of PVA concentration and stirring time on the mechanical properties of biodegradable plastic derived from kepok banana peels. This study used a completely randomized design with three variations of PVA concentration (3%, 4%, and 5%) and three variations of stirring time (25 minutes, 35 minutes, and 45 minutes). The results showed that at a PVA concentration of 5% with a stirring time of 45 minutes, bioplastics showed the best quality with a tensile strength value of 2.25 MPa, the best elongation at break was 416%, and the best elasticity was 0.541. In biodegradation, all samples were completely degraded within 7 days. It can be included that the addition of PVA concentration and the length of stirring effecth the mechanical properties of bioplastics but not on the biodegradation test.
Co-Authors AA Sudharmawan, AA Afrilla, Sonya Ambran Hartono Angraini, Sri Arni Sopianti Azzahra, Zakia Cahyaningrum, Wahyu Desti Yuspita Sari Doni, Monica Anatasya Fadhila Ulfa Jhora Fanny Rahmatina Rahim Fatni Mufit Fuad Sofaturahman Gusnedi Gusnedi Gusnedi, - Hidayati Hidayati Hidayati Hidayati Intan Purnama Yani Ismira, Ismira Jhora, Fadhila Ulfa Jhora, Fadhilla Ulfa Kasih Syirpia Lia Rifka Septiana Maharani, M Maritza Syalsabilla Masni Yanti, Meri Melisa Putri Mira Syuriyani Nadia Raisa Aryani Nawiyah, Nawiyah Pertama, Indri Saputri Putri, Sri Fany Mulya Rahmadani, Tika Rahmat Hidayat Rahmat Hidayat Raisa, Nadia Ramli Ramli Ratna Wulan Ratnawulan Ratnawulan . Rifka, Lia Rita Iranie Salsabilla, Salsabilla Sofaturrohman, Fuad Syafika, Herma Syafri, Syafri Syalsabilla, Maritza Syuriyani, Mira Ulfa Jhora, Fadhila Ulfa Jhora, Fadila Vitrini, Nora Wardatul Ullya Yenni Darvina Yohandri Bow Yuliana, Yuli Yuliani, Kurnia Dwi Yulifarma, Rika Yuliza Noerman, Kiki Yurnetti, Yurnetti Zahra, Hayatun Nufus