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All Journal Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Biosel: Biologi Science and Education
Maradona Maradona
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Education Energy Engineering Environmental Science

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Pengaruh Kadar Sulfur Dan Plastisizer Paraffin Terhadap Morfologi Dan Sifat Karet Alam Thermoset Dengan Filler Abu Sawit/Carbon Black Maradona Maradona; Nirwana Nirwana; Bahruddin Bahruddin
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 1, No 1 (2014): Wisuda Februari Tahun 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Sulfur and plasticizer has an important role in the manufacture of thermoset rubber. Plasticizer serves to increase the spread of filler in the elastic properties of rubber. While the function of sulfur during the vulcanization process. This research aims to study the effect of sulfur and paraffin plasticizers on the morphology and properties of thermoset rubber with palm ash /carbon black as filler. sufur content used were 1,5 phr 2,5 phr and 3 phr (per hundred rubber ). Plastisizer content used were 2,5 phr and 5 phr. Mastication process is carried out using a roll mill at room temperature, roll rotational speed of 20 rpm, and the overall time of the manufacture of compound ± 50 minutes. Activator used was ZnO, a co–activator used was stearic acid, an accelerator used was MBTS, antidegradant used was TMQ. Vulcanization process was carried out at a temperature of 150 °C and pressure of 50 kgf/cm2. Testing of mechanical properties includes tensile strength, elongation at break and elastic modulus using standard ISO 527-2 type 5A with a universal testing machine. Testing morphology was carried out using a scanning electron microscope (SEM). Other parameter tested is water absorption resistance. The results showed that the rate of sulfur and plasticizer influence the properties of vulcanized rubber. The best mechanical properties obtained at 2.5 phr sulfur and 2.5 phr plasticizer with filler ratio of palm ash /carbon black 30/70 with a tensile strength of 18.41 MPa, elongation at break 1155.9 % and elastic modulus of 0.9 MPa.                                     Keywords : sulfur , plasticizers , fillers hybrid , natural rubber , vulcanized
PERBANDINGAN KEMAMPUAN ADAPTASI BAKTERI Staphylococcus aureus dan BAKTERI Escherichia coli PADA EKSTRAK DAUN KARAMUNTING (Melastoma malabathrium) Noor Hujjatusnaini; Astuti Muh Amin; Riafany Febrianty; Annisa Maisyarah; Brenda Mila Agriana; Dwi Dian Septianingrum; Maradona Maradona; Noor Sari Wulandari
BIOSEL (Biology Science and Education): Jurnal Penelitian Science dan Pendidikan Vol 11, No 1 (2022): BIOSEL (Biology Science and Education): Jurnal Penelitian Science dan Pendidika
Publisher : INSTITUT AGAMA ISLAM NEGERI AMBON

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (263.273 KB) | DOI: 10.33477/bs.v11i1.2534

Abstract

Karamunting plant (Melastoma malabathricum) contains ethonol which is able to inhibit the growth of gram-negative bacteria such as Escherichia coli, S. aureus, S. sonnei, C. jejuni, E. colaceae and P. aeruginosa. This study is an experimental study that aims to compare the adaptability of Staphylococcus aureus and Escherichia coli bacteria by providing concentrations of karamunting leaf extract 20% 40%, 60%, and 80% within 24 hours, 48 hours and 72 hours. The results showed that the positive and negative control treatments were not able to inhibit the growth of Escherichia coli and bacteria Staphlococcus aureus. Karamunting leaf extract (Malastoma malabathrium) has similarities that are effective in inhibiting the bacteria Staphylococcus aureus and Escherichia coli bacteria with a concentration of 60%. In addition, there are differences in adaptability between Staphylococcus aureus and Escherichia coli bacteria. bacteria are Staphylococcus aureus more adaptable than Escherichia coli bacteria, because they produce a smaller inhibition zone than Escherichia coli bacteria. Keywords: Karamunting, Escherichia coli, Staphlococus aureus, Adaptation
Co-Authors Annisa Maisyarah Astuti Muh. Amin Bahruddin Brenda Mila Agriana Dwi Dian Septianingrum Nirwana Nirwana Noor Hujjatusnaini Noor Sari Wulandari Riafany Febrianty