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Sosiati, Harini
Jurusan Teknik Mesin , Fakultas Teknik, Universitas Muhammadiyah Yogyakarta, Yogyakarta, Indonesia
Agriculture, Biological Sciences & Forestry Arts Humanities Astronomy Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Energy Engineering Health Professions Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Nursing Physics Public Health Social Sciences

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Pengaruh Perlakuan Sebelum Alkalisasi dan Waktu Alkalisasi terhadap Sifat Bending Komposit Serat Sisal/PMMA Rahman, Muhammad Budi Nur; Sosiati, Harini
Semesta Teknika Vol 23, No 1 (2020): MEI 2020
Publisher : Semesta Teknika

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

Abstract

Penelitian komposit serat alam untuk meningkatkan kekuatan mekanis telah dilakukan, salah satunya memodifikasi permukaan serat. Tujuan penelitian ini adalah mengetahui pengaruh pencucian serat sebelum proses alkalisasi dan waktu alkalisasi terhadap sifat bending komposit serat sisal/PMMA. Serat sisal diberi perlakuan sebelum dicetak menjadi komposit dengan dicuci aquades, deterjen, dan direbus sampai mendidih dilanjutkan perlakuan alkali (6% NaOH) selama 12 jam. Variasi waktu alkalisasi adalah 4, 12, 24, dan 40 jam dengan pencucian aquades. Komposit dicetak menggunakan metode cold press dengan fraksi volume serat 20% dan tekanan 125 kg/cm2 ditahan selama 1 jam. Pengujian tarik dengan ASTM D3379-75, uji bending dengan ASTM D790-03 dan analisa morfologi serat menggunakan mikroskop optik dilakukan dalam penelitian ini. Pencucian serat sisal dengan aquades menghasilkan kekuatan tarik serat tunggal sebesar 4,87 MPa sedangkan pencucian serat menggunakan detergen sebesar 4,38 MPa dan serat yang direbus sebesar 4,00 MPa. Komposit dengan serat dicuci aquades memiliki kekuatan dan modulus bending tertinggi sebesar 136,602 MPa, dan 341,810 MPa sedangkan nilai regangannya terendah sebesar 0,117. Semakin lama perlakuan alkali akan menurunkan nilai kekuatan dan modulus elastisitas sedangkan reganganmya naik. Perlakuan 4 jam alkali, memiliki kekuatan sebesar 132,534 MPa, modulus bending 356,941 MPa, dan regangan 0,117. Struktur serat yang dicuci aquades tetap utuh sedangkan yang dicuci detergen dan direbus terjadi kerusakan. Semakin lama perlakuan alkali menyebabkan lignin terkikis sehingga ikatan serat menjadi lemah.Research on natural fiber composites to increase mechanical strength has been carried out, one of which is modifying the fiber surface. The purpose of this study was to determine the effect of washing the fibers before the alkalization process and the alkalization time on the bending properties of sisal fiber / PMMA composites. Sisal fibers were treated before being molded into a composite by washing with distilled water, detergent, and boiling until boiling followed by alkaline treatment (6% NaOH) for 12 hours. The variations in alkalization time were 4, 12, 24, and 40 hours with distilled water washing. The composites were molded using a cold press method with a fiber volume fraction of 20% and a pressure of 125 kg / cm2 held for 1 hour. Tensile testing with ASTM D3379-75, bending test with ASTM D790-03 and fiber morphological analysis using an optical microscope were carried out in this study. Washing sisal fibers with distilled water produces a single fiber tensile strength of 4.87 MPa, while washing the fibers using detergent is 4.38 MPa and boiled fiber is 4.00 MPa. Composites with distilled water washed fibers had the highest strength and bending modulus of 136.602 MPa and 341.810 MPa, while the lowest strain value was 0.117. The longer the alkaline treatment will decrease the strength and elastic modulus values while the strain increases. The 4 hours treatment is alkaline, has a strength of 132.534 MPa, bending modulus of 356.941 MPa, and strain of 0.117. The structure of the fibers washed with distilled water remains intact, while those washed with detergent and boiled are damaged. The longer the alkaline treatment causes the lignin to be eroded so that the fiber bonds become weak.
Pengaruh Perlakuan Sebelum Alkalisasi dan Waktu Alkalisasi terhadap Sifat Bending Komposit Serat Sisal/PMMA Rahman, Muhammad Budi Nur; Sosiati, Harini
Semesta Teknika Vol 23, No 1 (2020): MEI 2020
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v23i1.9349

Abstract

Penelitian komposit serat alam untuk meningkatkan kekuatan mekanis telah dilakukan, salah satunya memodifikasi permukaan serat. Tujuan penelitian ini adalah mengetahui pengaruh pencucian serat sebelum proses alkalisasi dan waktu alkalisasi terhadap sifat bending komposit serat sisal/PMMA. Serat sisal diberi perlakuan sebelum dicetak menjadi komposit dengan dicuci aquades, deterjen, dan direbus sampai mendidih dilanjutkan perlakuan alkali (6% NaOH) selama 12 jam. Variasi waktu alkalisasi adalah 4, 12, 24, dan 40 jam dengan pencucian aquades. Komposit dicetak menggunakan metode cold press dengan fraksi volume serat 20% dan tekanan 125 kg/cm2 ditahan selama 1 jam. Pengujian tarik dengan ASTM D3379-75, uji bending dengan ASTM D790-03 dan analisa morfologi serat menggunakan mikroskop optik dilakukan dalam penelitian ini. Pencucian serat sisal dengan aquades menghasilkan kekuatan tarik serat tunggal sebesar 4,87 MPa sedangkan pencucian serat menggunakan detergen sebesar 4,38 MPa dan serat yang direbus sebesar 4,00 MPa. Komposit dengan serat dicuci aquades memiliki kekuatan dan modulus bending tertinggi sebesar 136,602 MPa, dan 341,810 MPa sedangkan nilai regangannya terendah sebesar 0,117. Semakin lama perlakuan alkali akan menurunkan nilai kekuatan dan modulus elastisitas sedangkan reganganmya naik. Perlakuan 4 jam alkali, memiliki kekuatan sebesar 132,534 MPa, modulus bending 356,941 MPa, dan regangan 0,117. Struktur serat yang dicuci aquades tetap utuh sedangkan yang dicuci detergen dan direbus terjadi kerusakan. Semakin lama perlakuan alkali menyebabkan lignin terkikis sehingga ikatan serat menjadi lemah.Research on natural fiber composites to increase mechanical strength has been carried out, one of which is modifying the fiber surface. The purpose of this study was to determine the effect of washing the fibers before the alkalization process and the alkalization time on the bending properties of sisal fiber / PMMA composites. Sisal fibers were treated before being molded into a composite by washing with distilled water, detergent, and boiling until boiling followed by alkaline treatment (6% NaOH) for 12 hours. The variations in alkalization time were 4, 12, 24, and 40 hours with distilled water washing. The composites were molded using a cold press method with a fiber volume fraction of 20% and a pressure of 125 kg / cm2 held for 1 hour. Tensile testing with ASTM D3379-75, bending test with ASTM D790-03 and fiber morphological analysis using an optical microscope were carried out in this study. Washing sisal fibers with distilled water produces a single fiber tensile strength of 4.87 MPa, while washing the fibers using detergent is 4.38 MPa and boiled fiber is 4.00 MPa. Composites with distilled water washed fibers had the highest strength and bending modulus of 136.602 MPa and 341.810 MPa, while the lowest strain value was 0.117. The longer the alkaline treatment will decrease the strength and elastic modulus values while the strain increases. The 4 hours treatment is alkaline, has a strength of 132.534 MPa, bending modulus of 356.941 MPa, and strain of 0.117. The structure of the fibers washed with distilled water remains intact, while those washed with detergent and boiled are damaged. The longer the alkaline treatment causes the lignin to be eroded so that the fiber bonds become weak.
The Influence of Fiber Treatment and Matrix Type on the Impregnation Quality of Carbon Fiber Reinforced Thermoplastics Budiyantoro, Cahyo; Sosiati, Harini; Syahputra, Kevin Atila; Sudarisman, Sudarisman
Semesta Teknika Vol 26, No 1 (2023): MEI
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v26i1.18597

Abstract

One of the main issues with Carbon Fiber Reinforced Thermoplastics (CFRTP) is the poor impregnation quality of the matrix on carbon fiber due to the high viscosity of the thermoplastic. Impregnation quality can significantly affect the mechanical properties of the composite. This study aims to compare the impregnation abilities of various types of thermoplastic matrices on carbon fiber. The matrices used in this study are HDPE, PC, and PET. Three variations of carbon fiber treatment were employed: the first variation involved immersion in liquid nitrogen at -196°C, the second variation included heating in an electric furnace at 600°C followed by rapid cooling in liquid nitrogen, and the third variation utilized treatment with a silane coupling agent. The research findings demonstrate that composites comprising a Polycarbonate matrix and carbon fiber reinforcement, treated with a silane coupling agent, exhibit superior impregnation quality, as evidenced by an Interfacial Shear Strength (IFSS) value of 9.34 MPa.. The lowest impregnation quality was observed in HDPE reinforced with carbon fiber that had been heated and rapidly cooled, with an IFSS of 5.52 MPa.
Fabrication and Characterization of PVC-Based Nanofiber Membranes for Water Filtration Application Sosiati, Harini; Ramadhan, Fachri; Rahman, M. Budi Nur
Semesta Teknika Vol 26, No 1 (2023): MEI
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v26i1.18476

Abstract

Polyvinyl chloride (PVC) dissolved in N-dimethylacetamide (DMAC) and filled with polyvinyl pyrrolidone (PVP) has been studied for water treatment applications due to the material being hydrophobic, rigid, and biodegradable. However, it does not have antibacterial properties. The chitosan nanoparticles (CSNPs) as a natural antibacterial polymer are added into PEO/PVC blend to fabricate nanofiber membranes for well water filtration. We investigate the effects of adding PEO and CSNPs to PVC on the morphology, tensile properties, water contact angle, and water filtration efficiency of the nanofiber membranes. The PEO-PVC polymer solutions are dissolved in DMAC by varying concentrations of 0, 1, 2, 3, and 4% PEO (w/w), then fabricated to be the nanofiber membranes by the electrospinning technique. The PEO/PVC membrane’s contact angle decreases with the PEO concentration and by adding 1% CSNPs. This trend aligns with the average nanofiber diameter but is opposite to the tensile strength. The 1% CSNPs/4% PEO/PVC membrane has shown 78% and 92% efficiency in filtering Coliform and Colitinja bacteria in the well water, respectively.
Co-Authors Abdul Rahman Adi Nugroho Aditya Kurniawan Alif Nur Widodo Anggariawan, Arista Anggariawan, Arista Aris Widyo Nugroho Atik Septi Winarsih Attoriq, Fajri Azhar, Ardhia Revarti Bagas Mulya Waskitho Bambang Riyanta, Bambang Beni Firiya Budiyantoro, Cahyo Cahyo Trisedyo Utomo Dani Rahman Putra Dias Saputra Utama Fatwaeni, Yuni Nur Firiya, Beni Ghanim Raihan Ghozali, Mohamad Yuzdhie Ghozali Ghozali, Mohamad Yuzdhie Ghozali Ibnul Fatoni, Miftahul Faruq Irfan, Abdullah Irmawan, wiwin Iwan Setiono J. Wawan Joharwan Kencono, Dewi Sekar khadliq, muhammad Krisdiyanto, Krisdiyanto M. Puji Ibnu Mimbar Maulana Maemunah Maemunah Marizal Marizal Marizal Marizal Maulana, M. Puji Ibnu Mimbar Mirza Yusuf Muhajir Muhajir, Muhajir Muhamad Irawansyah muhammad khadliq Mujiyana Mujiyana Muttaqien, Arif Rahman Nurhadi, Taufik Pamasti, Ankas Putra, Dani Rahman Rahman, M. Budi Nur Rahman, Muhammad Budi Nur Rahmat Ramadhan Raihan, Ghanim Ramadhan, Fachri Sahputra, Kelvin Kurniawan Santosa, Tito Hadji Agung Sukamto, Ika Sumiyarsi Suminto, Joko Syahputra, Kevin Atila Taufik Nurhadi TH Adi Nugroho Totok Suwanda Tri Wahyono Tri Wahyono, Tri Waskitho, Bagas Mulya Wicaksono, Ryan Nauval Wijaya Agus Firmansyah wiwin Irmawan Yashinta Farahsani