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All Journal Jurnal Pendidikan Teknologi dan Kejuruan Jurnal Rekayasa Material, Manufaktur & Energi Suluah Bendang: Jurnal Ilmiah Pengabdian Kepada Masyarakat Teknomekanik Community Empowerment Journal of Engineering Researcher and Lecturer J-CoSE: Journal of Community Service & Empowerment
Rahmadiawan, Dieter
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Aerospace Engineering Arts Humanities Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Mechanical Engineering Public Health Social Sciences Other

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Enhanced durability and tribological performance of polyvinyl alcohol/layered double hydroxide/tannic acid composites under repeated swelling cycles Rahmadiawan, Dieter; Shi, Shih-Chen; Zhuang, Wei-Ting; Indrawan, Eko; Fernanda, Yolli; Syahri, Budi; Irzal, Irzal
Teknomekanik Vol. 7 No. 2 (2024): Regular Issue
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/teknomekanik.v7i2.32872

Abstract

In recent years, the exploration of polyvinyl alcohol (PVA) composites has garnered significant attention due to their versatility applications in aqueous environments. However, despite their promise, neat PVA exhibit limitations such as significant mechanical degradation under repeated swelling cycles. This study investigates the durability and tribological performance of polyvinyl alcohol (PVA) composites reinforced with nickel-iron layered double hydroxide (LDH) and tannic acid (TA) under repeated swelling cycles. Building on previous research that explored composite preparation and initial characterization, this research emphasizes the effects of cyclic swelling on wear resistance, friction behavior, and mechanical properties. Tribological tests were conducted to evaluate the coefficient of friction (COF) and wear rate before and after multiple swelling cycles, alongside tensile strength and strain measurements. The results revealed that the PVA/TA2/LDH2 composite, containing the highest additive content, exhibited the lowest wear rate of 11.52 × 10⁻⁵ mm³/Nm after 3 swelling cycles, demonstrating superior resistance to material degradation. Although PVA/TA2/LDH1 exhibited a slightly lower COF, its wear rate was higher due to reduced reinforcement. Compared to neat PVA, which showed a COF increase from 0.45 to 0.53, the PVA/LDH/TA composites retained their tribological stability, with only a marginal increase in COF and wear rate. Similarly, tensile strength of PVA/TA2/LDH2 decreased by only 11% after 3 cycles (from 33.3 MPa to 30 MPa), while neat PVA experienced a 25.5% reduction (from 30 MPa to 22.5 MPa). These findings highlight the potential of PVA/LDH/TA composites for applications in aqueous environments, offering significantly enhanced long-term performance and reliability.
Peningkatan Produktivitas Pertanian Padi di Kenagarian Parit Melalui Inovasi Mesin Perontok Padi Sistem Lorong Hembus Arafat, Andril; Irzal, Irzal; Adri, Junil; Syahri, Budi; Rahmadiawan, Dieter
Suluah Bendang: Jurnal Ilmiah Pengabdian Kepada Masyarakat Vol 23, No 1 (2023): Suluah Bendang: Jurnal Ilmiah Pengabdian kepada Masyarakat
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/sb.02990

Abstract

Permasalahan yang dihadapi Indonesia pada tahun 2020-2021 adalah minimnya produksi pangan yang mengakibatkan Indonesia harus melakukan Import beras dari negara tetangga. Hal ini dimungkinkan karena masih belum serius dalam mengatasi permasalahan-permasalahan yang dihadapi petani. Kabupaten Pasaman Barat merupakan salah satu daerah perbatasan provinsi Sumatera Barat yang luas akan lahan pertaniannya. Salah satu wilayah di Pasaman Barat yang mayoritas masyarakatnya bertani padi adalah Kenagarian Parit. Para petani padi di Kenagarian Parit masih banyak menghadapi permasalahan-permasalahan dalam penangan padi, terutama pada pasca panen. Dari pemantauan tim pengabdian dan info yang didapatkan dari kelompok tani KWT-Bundo Ramai Sejahtera, petani masih kekurangan alat dalam penanganan pada pasca panen, sehingga petani masih banyak melakukan perontokan dengan cara memukulkan padi pada alat yang masih sederhana. Kegiatan yang bersifat konvensional ini menjadikan lambatnya penanganan padi pada pasca penen. Dampak dari keterlambatan penanganan pada pasca panen dapat mengakibatkan susut hasil panen dan menurunnya kualitas gabah. Pelaksanaan pengabdian kepada masyarakat telah dilaksanakan terhadap masyarakat khalayak sasaran. Dalam pelaksanaan tujuan kegiatan telah tercapai. Dari evalusai yang dilakukan telah terjadi peningkatan pengatahuan masyarakat di Kenagarian Parit untuk memanfaatkan teknologi pada penanganan padi pada pasca panen. Peningkatan nilai ekonomis yang dihasilkan diharapkan dapat meningkatkan kesejahteraan masyarakat yang ada di Kenagarian Parit.
Enhancing biodegradable polymer surface wettability properties through atmospheric plasma treatment and nanocellulose incorporation Shi, Shih-Chen; Hsieh, Chia-Feng; Rahmadiawan, Dieter
Jurnal Pendidikan Teknologi Kejuruan Vol 7 No 2 (2024): Regular Issue
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jptk.v7i2.36723

Abstract

This study investigates the effects of atmospheric plasma treatment on the surface properties of polylactic acid (PLA)/nanocrystalline cellulose (CNC) composites, aiming to improve their wettability and mechanical properties. The research utilizes a twin-screw extrusion process for fabricating PLA/CNC biocomposites, followed by surface modification using a custom-built, with a tenfold high-voltage atmospheric plasma system. The motivation of this treatment was to improved surface wettability and potential for enhanced adhesive bonding in ecological applications. These findings contribute to developing more sustainable composite materials by providing a method to improve the functionality of biodegradable polymers without compromising their environmental benefits.
Revolutionizing polymethyl methacrylate toughness: Achieving 190% improvement with nanocellulose reinforcement while maintaining optical clarity Liu, Guan-Ting; Shi, Shih-Chen; Rahmadiawan, Dieter
Jurnal Pendidikan Teknologi Kejuruan Vol 7 No 4 (2024): Regular Issue
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jptk.v7i4.39823

Abstract

Polymethyl methacrylate (PMMA) is widely used in applications requiring high transparency and durability, such as optical lenses and protective coatings. However, its inherent brittleness limits its application in high-impact environments. This study investigates the incorporation of cellulose nanocrystals (CNCs) into PMMA to significantly enhance its toughness without compromising its optical clarity. By reinforcing PMMA with CNCs, the nanocomposites exhibited a remarkable 190% increase in toughness while maintaining 90% optical transparency. The innovation lies in achieving a balance between toughness and transparency through controlled CNC dispersion within the PMMA matrix, which minimizes excessive bonding that could lead to brittleness. Proper CNC dispersion was achieved through in-situ polymerization, allowing the nanocrystals to interact with the polymer matrix through van der Waals forces rather than covalent bonds. This approach reduces stress concentration and mitigates the formation of defects in the polymer matrix, ultimately leading to a tougher, more flexible material. In addition to enhancing mechanical properties, this study underscores the importance of controlling CNC content to preserve the intrinsic optical transparency of PMMA. These findings open new possibilities for CNC-reinforced PMMA in advanced applications that demand high mechanical performance coupled with excellent optical properties, extending its use in fields such as medical devices, protective coatings, and transparent structural materials.
Trends in anti-UV films or composites: A bibliometric study Rahmadiawan, Dieter; Santos, Thiago F.; Aslfattahi, Navid; Shi, Shih-Chen; Indrawan, Eko; Ramadhan, Athaya; Abadi, Zainal
Teknomekanik Vol. 8 No. 2 (2025): Regular Issue
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/teknomekanik.v8i2.44072

Abstract

Anti-UV films and composites play a critical role in protecting materials from ultraviolet-induced degradation, which can weaken polymers, reduce product lifespan, and compromise performance in sectors such as food packaging, outdoor coatings, and biomedical devices. The growing emphasis on sustainability and the need for environmentally friendly protective materials have further accelerated research on UV-shielding technologies that incorporate biopolymers, multifunctional additives, and renewable resources. This study presents a comprehensive bibliometric analysis of global research on anti-UV films and composites over the period 2014–2024. Data were retrieved from the Scopus database and analyzed using Bibliometrix (R package) and VOSviewer were employed to analyze publication patterns, map keyword networks, and visualize thematic evolution, as these tools enable robust quantitative and structural mapping of large bibliographic datasets. Three dominant thematic clusters were identified: (i) nanoparticle-based UV shielding using inorganic fillers such as ZnO and TiO₂, (ii) multifunctional films integrating UV protection with antibacterial and antioxidant properties, and (iii) biopolymer-based matrices emphasizing mechanical durability and environmental sustainability. These clusters highlight the convergence of performance, sustainability, and multifunctionality as key drivers shaping current research directions. Despite significant progress, the analysis reveals limited attention to scalability, industrial compatibility, and long-term performance evaluation. The findings underscore the need for future research to incorporate pilot-scale processing, life-cycle assessments, and interdisciplinary collaboration to bridge the gap between laboratory formulations and commercial implementation. Overall, this bibliometric study provides a consolidated understanding of the evolution and research landscape of anti-UV films and composites.
Co-Authors - Primawati A, Yufrizal Abral, Hairul Akbar, Irfan Muhammad Anne Zulfia Arafat, Andril Arya Rudi Nasution Aslfattahi, Navid Budi Syahri Dinul, Fadhilah Ikhsan Donny Fernandez Eko Indrawan Elshaarani, Tarig Elviza Yeni Putri Fajar Ramadhan, Fajar Fauza, Anna Niska Hsieh, Chia-Feng ilham yuliady Ilhamsyah, Febrian Irzal, Irzal Junil Adri Laghari, Imtiaz Ali Liu, Guan-Ting Nasruddin Nurdin Hendri Nuzul Hidayat, Nuzul Oktaviani, Adinda Rahmadani Rahmadani Ramadhan, Athaya Rudi Kurniawan Santos, Thiago F. Shi, Shih-Chen Wagino Wanda Afnison Yolli Fernanda Zahrul Fuadi Zainal Abadi Zhuang, Wei-Ting