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All Journal BIOMA Jurnal Ilmiah Teknik Kimia Jurnal Karya untuk Masyarakat (JKuM) Journal of Chemical Process and Material Technology
Sri Sutanti
Politeknik Katolik Mangunwijaya
Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Engineering Materials Science & Nanotechnology Social Sciences

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PEMBUATAN BENANG OPERASI DARI ECENG GONDOK Sari Purnavita; Lucia Hermawati Rahayu; Sri Sutanti
Bioma : Jurnal Ilmiah Biologi Vol 7, No 2 (2018): Bioma
Publisher : Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/bioma.v7i2.2854

Abstract

Operating thread needs in Indonesia to increase, but until now to supply the needs of operating threads absorbed (can be integrated with the body) still depends on imported products that are expensive. To reduce Indonesia's dependence on biomaterials imports in the field of biomedicine, it can be done through the engineering of operating yarn production absorbed from Indonesia's natural resources. Poly Lactic Acid (PLA) is a polymer that is widely applied as a biomaterial in biomedical fields such as operating threads. In this research, absorbable suture was made from poly lactic acid poly polymer blend from water hyacinth with natural glucomannan polymer of iles-iles. The aim of the study was to study: 1) the effect of polymerization reaction time on PLA yields and 2) the effect of poly lactic acid-glucomannan composition on the mechanical properties of operating threads. Making PLA using the ring opening polymerization method and making yarn using the wet spinning method. The independent variables at the manufacturing stage of the PLA polymer are reaction time = 60, 90, 120, and 150 minutes, while for the variable at the stage of operation yarn making is the ratio between the PLA period: glucomannan = (1: 3); (1: 2); ( 1: 1); (2: 1); (3: 1). The results showed that: 1) reaction time had a very significant effect on yield PLA and 2) different composition of poly lactic acid - glucomannan gave different tensile strength and tensile elongation values. Keywords: water hyacinth, poly lactic acid, glucomannan, operating thread
Pelatihan Teknologi Pembuatan Lem Poli Vinil Asetat (PVAc) pada Produsen Album Elvira Sari Purnavita; Sri Sutanti
Jurnal Karya untuk Masyarakat Vol 1, No 2 (2020): Jurnal Karya untuk Masyarakat
Publisher : STIKS Tarakanita

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (437.848 KB) | DOI: 10.36914/jkum.v1i2.389

Abstract

Di Era digital seperti ini, industri album photo masih potensial untuk digemari oleh masyarakat sebagai konsumen. Salah satu, produsen yang menggeluti dalam bidang album foto hingga saat ini yaitu “ALBUM ELVIRA”. Perusahaan ini memiliki kendala dalam harga produksi karena selama ini pembelian lem yang relatif mahal menambah cost produksi. Oleh karena itu, produsen album Elvira berkeinginan untuk mampu memproduksi lem sendiri, sehingga mampu menekan cost biaya produksi dan harga jual album dapat bersaing di pasaran. Untuk mengatasi permasalahan tersebut maka diberikan workshop dan pelatihan pembuatan polimer Poli Vinil Asetat (PVAc) yang dapat diaplikasikan sebagai lem pada kertas. Metode yang diterapkan dalam kegiatan pengabdian masyarakat ini yaitu pemberian materi dan workshop mengenai polimer Poli Vinil Asetat (PVAc). Hasil dari kegiatan pengabdian masyarakat ini mitra Album Elvira bersikap kooperatif dan antusias dalam mengikuti kegiatan pemberian materi dan diskusi. Dari kegiatan pengabdian masyarakat ini dapat diambil kesimpulan (1) Mitra telah mengetahui monomer penyusun, formulasi, dan prosedur pembuatan polimer PVAc. (2) Mitra dapat membuat polimer PVAc untuk selanjutnya diaplikasikan menjadi lem kertas untuk menjawab kendala yang selama ini dihadapi oleh mitra. (3) Pada pelatihan dihasilkan emulsi polimer PVAc yang cukup stabil, larut air, dengan PH 6 dan memiliki ukuran partikel kurang dari satu micron, serta masa simpan pada suhu kamar selama sebulan.
MODIFICATION OF LINDUR STARCH (Bruguiera Gymnorrhiza L.) BY OXIDATION USING SODIUM HYPOCLORITE AND FERRO SULPHATE CATALYST Lucia Hermawati Rahayu; Sri Sutanti; Mumpuni Asih Pratiwi; Rahelia Cahyaningtyas
Journal of Chemical Process and Material Technology Vol 1, No 2 (2022)
Publisher : Universitas Wahid Hasyim

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (496.681 KB) | DOI: 10.36499/jcpmt.v1i2.6669

Abstract

Lindur fruit (Bruguiera gymnorrhiza L.) is widely available in Indonesia and has a high carbohydrate content, so it has the potential to be developed as a new source of energy and starch. So far, the use of lindur fruit is still limited to substitute rice and snacks. Therefore, it is necessary to make efforts to increase the utilization of lindur fruit by processing it into lindur starch and its derivatives (modified starch). The properties of lindur starch need to be improved in order to have wider uses in the food and non-food industries. The purpose of this study was to modify lindur starch by oxidation using NaOCl with ferrous sulfate as a catalyst. In this study, the effect of sodium hypochlorite concentration (2%, 4%, 6%, and 8%) and ferrous sulfate concentration (0%, 0.1%, 0.2%, and 0.3%) on the physicochemical characteristics of starch was studied. the resulting oxidized leachate and determined the optimal conditions. The results showed that all the variables studied affected the oxidation reaction of lindur starch. Oxidation at 4% NaOCl concentration and 0.2% ferrous sulfate concentration was able to produce the best values for carboxyl content, solubility, and swelling.
Polymerization of Poly Methyl Methacrylate Using Emulsion Method and H2O2 as Initiator Sari Purnavita; Cyrilla Oktaviananda; Sri Sutanti; Herman Yoseph Sriyana; Antonius Prihanto; Antonio Mafeli
Journal of Chemical Process and Material Technology Vol 1, No 2 (2022)
Publisher : Universitas Wahid Hasyim

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (13.67 KB) | DOI: 10.36499/jcpmt.v1i2.6642

Abstract

This study aims to study the effect of the amount of initiator (H2O2) on the viscosity of the Polymethyl Methacrylate (PMMA) emulsion and the solids content. The treatment of independent variables is H2O2 by 1%, 2%, 3%, and 4%. This research procedure was carried out in a two-stage process. The first stage is the process to separate the inhibitor contained in the methyl methacrylate monomer by adding a 1 N concentration of NaOH solution, stirring until evenly distributed, then put into a separating funnel to separate pure methyl methacrylate from the inhibitor dissolved in alkaline solution. The second stage is the polymerization reaction process using the emulsion method. Dissolve the poly vinyl alcohol in hot water at 70oC, put the poly vinyl alcohol solution into a three-neck flask, which is equipped with a stirrer and a hot plate heater, add the initiator and up to 60oC, then add the methyl methacrylate monomer with stirring and heating at room temperature 100oC for 1 hour. The resulting product is a thick poly methyl methacrylate emulsion, has a milky white color, and has good adhesion. Furthermore, the viscosity test was carried out using ford cup number 4 and the solids content test. The results showed that the more initiators added, the higher the viscosity and the higher the solids content.
Karakterisasi Bioplastik Berbahan Kombinasi Pati Jagung dan Tepung Jagung dengan Perekat Poli Vinil Alkohol (PVA) dan Pemlastis Gliserol Sri Sutanti; Mumpuni Asih Pratiwi; Lucia Hermawati; Lucia Hermawati Rahayu; Handika Gilang Ramadhan
Jurnal Ilmiah Teknik Kimia Vol 6, No 2 (2022): JURNAL ILMIAH TEKNIK KIMIA
Publisher : Program Studi Teknik Kimia, Universitas Pamulang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32493/jitk.v6i2.20912

Abstract

The much-needed packaging materials are still dominated by synthetic plastics which are difficult to decompose and produce dioxin gas, thus polluting the environment and dangerous for humans. The solution is to use bioplastics. The study aims to determine the characteristics of bioplastics in the ratio (%)  of corn starch to corn flour: 100:0; 80:20; 60:40; 40:60; 20:80; and 0:100. The study used RAL, and descriptive analysis. Starch suspension with a ratio of 1:20 as much as 100g/run was heated at a temperature of 70-80oC for 30 minutes while stirring added with 10% PVA solution and 1 mL of glycerol heated and stirred for 10 minutes, degassed for 10 minutes, molded and dried at 50-60oC for 24 hours. The resulted bioplastics were then characterized for their water resistance, film thickness, degradation, tensile strength, elongation at break, and morphology. The results showed that the addition of corn flour increased water resistance, film thickness, degradation time, tensile strength, and elongation at break. The best results in this study were obtained at a ratio of 0:100.
Co-Authors Antonio Mafeli Antonius Prihanto Cyrilla Oktaviananda Handika Gilang Ramadhan Herman Yoseph Sriyana Lucia Hermawati Lucia Hermawati Rahayu Mumpuni Asih Pratiwi Rahelia Cahyaningtyas Sari Purnavita