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All Journal Jurnal Pengolahan Hasil Perikanan Indonesia Jurnal Sains Materi Indonesia Majalah Kulit, Karet, dan Plastik Akuatikisle: Jurnal Akuakultur, Pesisir dan Pulau-Pulau Kecil Jurnal Rekayasa Material, Manufaktur & Energi Indonesian Journal of Chemistry Piston: Journal of Technical Engineering Specta Journal of Technology Akuatikisle: Jurnal Akuakultur, Pesisir dan Pulau-Pulau Kecil ASEAN Journal of Chemical Engineering Warta Perkaretan Journal of Materials Exploration and Findings (JMEF) Makara Journal of Technology Journal of Sciencce Technology and Visual Culture Jurnal Sains Materi Indonesia
Mochamad Chalid
Departemen Teknik Metalurgi Dan Material, Universitas Indonesia
Aerospace Engineering Agriculture, Biological Sciences & Forestry Arts Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Immunology & microbiology Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Effect of Cold Plasma Treatment on Physical Properties of Multilayer Plastics for Polymer Asphalt Applications Dimas Agung Setiaji; Mochamad Chalid; Tomy Abuzairi; Maurice Efroza; Adam Febriyanto Nugraha
Piston: Journal of Technical Engineering Vol 6, No 1 (2022)
Publisher : Prodi Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32493/pjte.v6i1.20771

Abstract

Multilayer plastic waste continues to increase due to the ever-growing consumption and needs of the global citizen and is one of the most challenging types of waste to recycling because of its nature. The accumulation and indiscriminate disposal of waste can pose a potential risk of environmental problems. A solution that can be implemented is to mix bitumen and waste polymer as asphalt manufacturing. Despite its advancement in research, many potential parameters are still to be discovered to achieve optimal results. Through cold plasma treatment, a surface treatment may occur at the multilayer polypropylene that causes the change from hydrophobic to hydrophilic properties. Treating the polymer with cold plasma will provide good hydrophilic properties without changing the overall chemical and thermal properties of the sample. This will result in an alternative aggregate for the bitumen for asphalt manufacturing. Bitumen coupled with the addition of plastic still provides an optimal hardness and ductility, meanwhile having a more economically viable manufacturing process than other processes.
PENGARUH FILLER BENTONIT TERMODIFIKASI TERHADAP PERILAKU SIFAT MEKANIK EBONIT KARET ALAM Asron Ferdian Falaah; Mochamad Chalid; Mohamad Irfan Fathurrohman
Warta Perkaretan Vol. 41 No. 1 (2022): Volume 41, Nomor 1, Tahun 2022
Publisher : Pusat Penelitian Karet - PT. Riset Perkebunan Nusantara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22302/ppk.wp.v41i1.815

Abstract

Karet ebonit mempunyai keunggulan karena sifat mekanik yang tinggi, kaku, dan keras namun cenderung mudah getas. Penambahan filler clay yang mengandung bentonit dinilai dapat mengurangi sifat getas karet ebonit. Studi ini mencoba membuat karet ebonit berbasis karet alam dengan variasi bentonit sebagai filler 0, 2, 4, 6, 8, 10 phr yang dicampur sebagai masterbatch karet alam yang menggunakan surfaktan kationik, dengan karet alam jenis RSS 1, belerang 30 phr dan bahan aditif lain dengan waktu 90 menit dan suhu vulkanisasi 1600C. Uji sifat rheologi menunjukkan semakin bertambahnya masterbatch yang mengandung bentonit dan dan surfaktan kationik ditambahkan akan memberikan pelunakan pada komposit. Hasil pengujian kekerasan menunjukkan kenaikan dengan bertambahnya bentonit yang digunakan. Pengujian kuat tarik komposit b4 (4 phr bentonit) menghasilkan nilai tertinggi 41,3 N/mm2 dan modulus young 362,77 N/mm2. Hasil uji SEM menunjukkan permukaan lebih halus pada b4 dengan terbentuk agregat yang sangat kecil dibanding dengan b10 yang cenderung lebih besar ukuran agregat. komposit b4 mengindikasikan filler terdistribusi baik karena ukuran agregat kecil sehingga memberikan pengaruh terhadap kekuatan mekanik lebih tinggi dibanding dengan komposit b10 dengan agregat besar yang cenderung terjadi aglomerasi sehingga filler tidak terdistribusi dengan baik.
MINI REVIEW HIDROGENASI KARET ALAM dody andi winarto; Mochamad Chalid; Chandra Liza; Mochamad Irfan Fathurrohman
Warta Perkaretan Vol. 41 No. 1 (2022): Volume 41, Nomor 1, Tahun 2022
Publisher : Pusat Penelitian Karet - PT. Riset Perkebunan Nusantara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22302/ppk.wp.v41i1.868

Abstract

Karet alam merupakan komoditas penting yang berperan sebagai bahan baku untuk berbagai aplikasi yang membutuhkan kekuatan tarik yang tinggi, fleksibilitas, daya rekat, ketahanan terhadap suhu rendah, ketahanan kikis, dan ketahanan terhadap air. Namun karet alam murni mempunyai kelemahan karena mengandung ikatan rangkap dua (C=C) yang menjadikan karet alam mempunyai ketahanan yang kurang baik terhadap oksidasi, panas, ozon dan lingkungan. Modifikasi karet alam berpotensi untuk menanggulangi masalah tersebut. Hidrogenasi merupakan modifikasi kimia untuk mengurangi ikatan rangkap dua tersebut yang dapat dilakukan dengan penambahan hidrogen. Proses hidrogenasi dilakukan dengan menggunakan katalis dan dapat dilakukan dengan donor hidrogen yaitu senyawa diimida pada kondisi yang relatif ramah. Keberhasilan hidrogenasi diukur dengan derajat hidrogenasi melalui beberapa metode. Dari penelusuran yang dilakukan, karet alam terhidrogenasi mempunyai prospek yang baik untuk diterapkan, namun hingga saat ini belum ada industrialisasi yang masif dalam memproduksinya.
Optimalisasi Sifat Mekanik Biokomposit PLA dengan Serat Arenga Pinnata Imam Prabowo; Mochamad Chalid
Journal of Science, Technology, and Visual Culture Vol 1 No 2 (2021): Oktober 2021
Publisher : Jurusan Teknologi Produksi dan Industri, Institut Teknologi Sumatera

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Polymer composite materials have been widely used in various industries, including construction and automobile industries. However, they have caused one critical problem, namely pollution. Thus, to minimize the impact, the scientists and expertise develop a biodegradable material so that it will decompose in the nature and avoid the pollutions. One of the alternatives is polylactide acid polymer and arenga pinnata fiber. This research was focused on the addition of 10% up to 30% amount of fiber to increase the mechanical properties of polymer composite with polylactide acid as a matrix and arenga pinnata fiber as a reinforcement agent. The mechanical properties were obtained by using universal testing machine and FESEM to observe the morphological structure. The results show that the mechanical properties especially tensile strength and young modulus have increased after the addition of 10% up to 20%, for example, tensile strength has grown from 50.5 MPa to 66 MPa, while young modulus has gone up approximately 183.2 MPa to 330.4 MPa. The decline of mechanical properties when the 30% of fiber was added are due to the void formed by the volatile substances during the preparations.
Enhancing Compatibility and Mechanical Properties of Natural Rubber Composites Sianturi, Krisma Yessi; Nugraha, Adam Febriyanto; kristaura, Belle; Chalid, Mochamad
Journal of Materials Exploration and Findings Vol. 2, No. 1
Publisher : UI Scholars Hub

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Abstract

Pure natural rubber (NR) exhibits low mechanical properties, necessitating the incorporation of additives like vulcanizing agents and fillers. Carbon black and silica, conventional fillers, are relatively expensive and not environmentally friendly. This study explores using Oil Palm Empty Fruit Bunch (OPEFB) fiber as an affordable, abundant, and biodegradable alternative filler for NR. However, compatibility issues arise between the nonpolar NR and the polar OPEFB fiber. A latex-starch hybrid coupling agent (CA (NR-St)) was added to the composite formulation to address this. NR, OPEFB fiber, and the coupling agent were mixed using an open roll mill with a 10 phr OPEFB filler loading and coupling agent concentrations of 0, 1, 2, and 3 phr. Fourier-transform infrared spectroscopy (FTIR), rheology, and mechanical property tests revealed that the coupling agent improved the compatibility between NR and OPEFB fibers, as evidenced by increased tensile strength and stiffness. The composite with 3-phr coupling agent exhibited the best performance with tensile strength and stiffness values of 25.6 MPa and 3.7 MPa, respectively. This increase in mechanical properties has the potential to act as a catalyst for increasing the use of renewable materials in the rubber industrial sector, especially the automotive industry.
Characterization of Glass Fiber / Epoxy with Various Silicone Resin Addition Composite’s Compressive and Flexural Strength Muhamad Hananuputra Setianto; Herry Purnomo; Mochamad Chalid
Jurnal Sains Materi Indonesia Vol. 25 No. 1 (2023): Jurnal Sains dan Materi Indonesia
Publisher : BRIN Publishing (Penerbit BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/jsmi.2023.277

Abstract

Glass fiber/epoxy composite was developed and used widely in manyapplications. Development on fiber and matrix of composite material was done to improve itsproperties. Improvement of the composite’s matrix can be done/by adding a modifier. Silicone resinis one kind of modifier that can be added to epoxy to improve its properties. Silicone resin willimprove the thermal stability of epoxy, but the effect on mechanical properties, especially whencombined with glass fiber, has not been done. In this study, a composite of glass fiber/epoxy with 0,10, 20, and 30 weight-% silicone resin addition was tested by compressive and flexural loadingmethods. Compressive strength and maximum strain tend to decrease with the increase of siliconeresin added. The highest compressive strength and strain were reached by a glass fiber and epoxycomposite without any modification at the value 240.63 MPa and 0.5%. Flexural strength willdecrease, but maximum strain will increase when more silicone resin is added to the matrix on theflexural test. The biggest flexural strength at 293.73 MPa was possessed by the composite withoutfurther modification, and a maximum strain of 5% was owned by the composite with 20% and 30%silicone resin addition.
Mechanical and Thermal Properties Analysis on Bitumen Mixture with Additives: HDPE, PP and Lignin Adream Bais Junior; Yermia Andri Prawira; Mochamad Chalid; Ahmad Z. Taning; Adam Febriyanto Nugraha
Piston: Journal of Technical Engineering Vol. 7 No. 2 (2024)
Publisher : Program Studi Teknik Mesin Universitas Pamulang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32493/pjte.v7i2.35464

Abstract

This study focuses on enhancing the performance and sustainability of asphalt materials in road construction by recycling High-Density Polyethylene (HDPE). Polypropylene (PP) and lignin as additives in bitumen. The Hot Melt Mixing method is employed to investigate the impact of different concentrations of HDPE, PP, and lignin on bitumen properties. Key properties such as ductility, penetration, softening point, and thermal behavior are analyzed, providing valuable insights into the potential of these additives to enhance bitumen performance. The findings demonstrate that higher concentrations of HDPE and PP result in reduced penetration depth, indicating increased hardness. The addition of lignin enhances penetration depth, contributing to the flexibility and performance of the bitumen mixture. Moreover, thermal analysis offers valuable information about the thermal behavior and stability of the bitumen-plastic-lignin blends, shedding light on their compatibility and interactions. This research contributes to the ongoing efforts in road construction and pavement engineering by exploring sustainable solutions that not only address plastic waste challenges but also improve the performance and durability of bituminous materials, making it a crucial step towards environmentally responsible and long-lasting asphalt pavements.
Pengaruh Bahan Bakar Campuran Biodiesel Berbahan Dasar Minyak Sawit terhadap Elastomer NBR Wimada, Andrias Rahman; Sholihah, Maharani Dewi; Karuana, Feri; Arisanti, Anisa Galuh; Ghazidin, Hafisd; Chalid, Mochamad
Rekayasa Material, Manufaktur dan Energi Vol 6, No 1: Maret 2023
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v6i1.12594

Abstract

The government implemented the use of a 30% biodiesel mixture in diesel fuel for all types of sectors in 2020. In the upcoming years, this policy will probably continue to be strengthened. The compatibility of the elastomers (seals, gaskets, and O-rings) used in the fuel system needs to be carefully considered, though, as biodiesel may have an adverse effect on components composed of natural rubber or synthetic rubber. This study aims to determine the compatibility of elastomeric fuel mixtures of 30% and 40% biodiesel based palm oil (CPO) in Indonesia. The elastomer used in this study, acrylonitrile butadiene rubber (NBR), is frequently utilized in the automobile industry or in fuel storage systems in the production of electricity, mining, and other industries. Using the ASTM D471 technique, the compatibility of this elastomer is evaluated based on mass swelling, swelling volume, tensile strength, and hardness. It was discovered by mass swelling, swelling volume, tensile strength, and hardness tests that the compatibility of acrylonitrile butadiene rubber diminishes with increasing biodiesel content (FAME).
Powder Coating Waste Utilization as a Filler in High-Density Polyethylene (HDPE) Coupled with PP-g-MA Shinta Dewi Ariantika; Mochamad Chalid; Azizah Intan Pangesty
Jurnal Sains Materi Indonesia Vol. 26 No. 2 (2025): Jurnal Sains dan Materi Indonesia
Publisher : BRIN Publishing (Penerbit BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/jsmi.2025.4963

Abstract

The powder coating process in industry typically generates waste during curing process. This non-recyclable and hazardous powder-coating waste is utilized as filler material in this research. Polyester was employed as filler in the High-Density Polyethylene (HDPE) Matrix Composite. The study investigated the impact of polyester composition at 20%, 30%, and 40%, with 5% of PP-g-MA coupling agent addition. To assess the effect as a coupling agent, 0%, 2%, 5%, and 10% of PP-g-MA were added to the composite with a matrix-filler ratio of 70:30. Mixing was conducted using the hot melt mixing method at 180°C and mixing speed 60 rpm, with duration 9 minutes. The characterization and tests include the measurements of surface tension using SEM, FTIR, TGA, DSC, and micro-tensile tests. The results indicate that polyester and PP-g-MA composition decrease the thermal properties of the composite. However, increasing the filler addition by up to 30% and PP-g-MA addition by up to 5% enhances the thermal properties. The tensile strength and stiffness of the composite with polyester filler and PP-g-MA are higher than pure HDPE. These are achieved with the addition of polyester filler 20% and a coupling agent composition of PP-g-MA at 5%.
Morphological and Crystallinity Studies of Nanofiber Cellulose Based on Sargassum sp. Using Multistep Preparation Nurhayati, Nurhayati; Irianto, Hari Eko; Chalid, Mochamad; Riastuti, Rini
Indonesian Journal of Chemistry Vol 25, No 4 (2025)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.104211

Abstract

This study aims to investigate the crystallinity and morphological characteristics of cellulose nanofibers (CNF) isolated from Sargassum seaweed through a multistep preparation. The isolation was conducted in stages, including alkalinization, bleaching, and mechanical reduction in fiber size. In addition to observing the outcomes at each isolation stage, three mechanical processes were implemented to generate CNF. The observed parameters included fiber morphology analyzed using scanning electron microscopy (SEM) and fiber crystallinity tested using X-ray diffraction (XRD). The results indicated that Sargassum mostly exhibits a type Iα structure of cellulose. The multistep treatment, combined with mechanical processing, resulted in finer fibers and an improved crystallinity index, reaching a maximum value of 70.39%. These findings suggest that cellulose nanofibers from Sargassum have the potential to be used in sustainable biomedical materials.
Co-Authors Abdul Aziz Ammar Achmad Nandang Roziafanto Achmad Nandang Roziafanto, Achmad Nandang Adam Febriyanto Nugraha Adi Cifriadi Adi Cifriadi Adi Cifriadi Adiwar Adiwar Adiwar Adiwar, Adiwar Adream Bais Junior Ahmad Z. Taning Anne Zulfia Arbi Irsyad Fikri Arief Ramadhan Arief Ramadhan Arisanti, Anisa Galuh Asron Ferdian Falaah Asron Ferdian Falaah Ausias, Gilles Azizah Intan Pangesty Azizah Intan Pangesty Bambang Priyono Chandra Liza Dasep Rusmana Dedi Priadi Dedi Supriadi Dessy Ayu Lestari Dick Ferieno Firdaus Dimas Agung Setiaji dody andi winarto Elfrida Ratnawati Elvi Kustiyah Elvi Kustiyah Farhan Aziz Fatriansyah, Jaka Fajar Fransiska, Dina Ghazidin, Hafisd Ghiska Ramahdita Ghiska Ramahdita Hanindito Haidar Satrio Hari Eko Irianto Hastiana, Sabina Herry Purnomo Imam Prabowo Imam Prabowo Ismail, Ika Ismojo Ismojo Jana Hafiza Joddy Arya Laksmono Karuana, Feri kristaura, Belle Luh Putu Ratna Sundari Majid Amrullah Masrudin Masrudin Maurice Efroza Mochamad Irfan Fathurrohman Mohamad Irfan Fathurrohman Muhamad Hananuputra Setianto Muhammad Ariya Afif Muhammad Joshua Yuriansyah Barmaki Muhammad Nicko Azharry Setyabudi Mutya Rahmah Arbi Nelson Saksono Nono Darsono Nono Darsono, Nono Norma Arisanti Kinasih Novita Putri Wahyuni Nugraha Wahyu Pratama Nurhana Rafika Sari Nurhayati Nurhayati Oman Zuas Rifathin, Annisa Rini Riastuti, Rini Salma Ilmiati Santi Puspitasari Santi Puspitasari Shinta Dewi Ariantika Sholihah, Maharani Dewi Sianturi, Krisma Yessi Sidartha, B. Boy Rahardjo Singgih Prabowo Solly Aryza Tomy Abuzairi Wijaya, Ade Mundari Wimada, Andrias Rahman Yermia Andri Prawira Zahra Krishna Hadi