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Journal : Indonesian Journal of Chemistry

ELECTRON BEAM CURING OF EPOXY ACRYLATE COATINGS ON MEDIUM-DENSITY FIBERBOARD Danu, Sugiarto; Darsono, Darsono
Indonesian Journal of Chemistry Vol 8, No 2 (2008)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (169.845 KB) | DOI: 10.22146/ijc.21624

Abstract

Most of the medium-density fiberboard (MDF) as an engineered woods need surface coating process before entering final products, such as furniture and building materials. The wood surface should be covered for surface protection from damage during service life as well as to enhance its appearance. Surface coating of MDF was conducted using epoxy acrylate resin either for clear and pigmented coatings. Titanium dioxide was used for white pigmented coatings. Coating was conducted at variation thickness level of 30 to 150 μm. Curing was carried out by using 350 kV electron beam accelerator at 1.35 mA current and 1.6 m/min conveyor speed to get the absorbed dose of 3 Mrad. Effect of coating thickness was evaluated by measuring the physical, mechanical and chemical properties of cured samples, i.e., hardness, gloss, transparency, adhesion, abrasion resistance, and chemical, solvent and stain resistance. Experimental results showed that pendulum hardness and abrasion resistance slightly increased whereas gloss, transparency and adhesion resistance decreased with increasing coating thickness, while chemical, solvent and stain resistance remains similar. In general, clear coating provides better properties than pigmented coating.   Keywords: electron-beam; coating; epoxy-acrylate; pigment; medium-density fiberboard
Performance Test of K0-NAA and Relative Method for Analysis of Al, Mg, K Nuclides in SRM Lake Sediment Sample Sunardi, Sunardi; Darsono, Darsono
Indonesian Journal of Chemistry Vol 17, No 2 (2017)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (304.956 KB) | DOI: 10.22146/ijc.24187

Abstract

A performance test has been conducted of k0-NAA and relative methods for analysis of Al, Mg, K nuclides in SRM lake sediment sample (SRM SL-3). The performance test included validation, accuracy and precision tests, as well as t and F test. This test is done in order to know the performance of the both methods. Test results on validation test of both the k0-NAA and relative methods obtained were still in good performance with z-score values within the range of -2 ≤ x ≤ 2, in the accuracy and precision test showed that the two methods used were still reliable or passed the test for elemental analysis. The results of the evaluation t-test were at 95% confidence level showed that both methods were no significant differences in the test results, and the evaluating the F test showed that there are no differences in the accuracy between the two methods. The performance test data are expected to be used by practitioners and users of neutron activation analysis services as the reference option of analysis method to optimize the objectives to be achieved.
Distribution Pattern of Volcanic Ash Essential Elements on the Top Layer of Agricultural Land Post Merapi Eruption in Sleman Murniasih, Sri; Darsono, Darsono; Sukirno, Sukirno; Saefurrochman, Saefurrochman
Indonesian Journal of Chemistry Vol 19, No 4 (2019)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (20.037 KB) | DOI: 10.22146/ijc.38348

Abstract

Volcanic ash contains essential elements to the soil fertility of agricultural land which is important to be investigated. The aim of this study was to determine the distribution pattern of volcanic ash essential elements as a result of volcanic eruption disaster using Surfer software. To input, the Surfer software, soil samples of volcanic ash at 10 sampling locations in Sleman at a radius of 14 to 26 km towards the south from a peak of Merapi were collected. Data of wind direction, humidity and ground level at the time of sampling were also collected. The concentrations of the essential element in samples were measured using NAA (neutron activation analysis). The pH of volcanic ash samples in each sampling locations was also measured. The results showed that volcanic ash for all sampling locations contained, Al, Fe, Na, K, and Si as major elements and Zn, Co, and Se as trace elements. The concentration distribution pattern of the Zn, Si, Co and Fe elements tends to decrease towards the peak of Merapi, on the other hand, the Na, and K elements showed that their distribution concentration tends to decrease away from the peak of Merapi. The wind’s speed affects the distribution range of an element contained in volcanic ash samples. The pH of volcanic ash samples seemingly only affect the concentration of Zn elements in the distribution pattern of elements.
Co-Authors A. Sudirman, A. Acepudin, Acepudin Ade Ayu Eres Setyarini, Ade Ayu Eres Ade Kurniawan Ade Pradana, Gita Adei Saputra, Adei Adelina Hasyim Adha Nur Hidayat, Adha Nur Adhysti Kartika Zamira Adi Baskara Perwira, Adi Adinda Ageng Syahputri, Adinda Ageng Afnan, Fauzi Agnes Carolina Agung Pramudito, Agung Agung Prihatmojo, Agung Agus Pujianto Agustira, Ines Agustono Agustono, Agustono Ahmad Rifan, Ahmad Ahmad Sudirman Aisyah Yohanella, Aisyah Akhmad Rasyid Syahputra, Akhmad Rasyid Akhsani Lubis Dwi Saputra, Akhsani Lubis Alben Ambarita Aldona Meylina Manalu, Aldona Meylina ali wijayanto Allantara, Rio Dedi Andika Nugroho Sulistianto, Andika Nugroho Angrayana, David Anik Sunarni Apriliani Rahmawati Apriyani Apriyani Apriyani, Cici Apriyanti Apriyanti Apriyanti, Bunga Ardhi Yudisthira Ariadi, Ariadi Arif Wibawa, Fajri Arisandi, Tiras Adi Arwin Surbakti Asmaul Khair Astuti, Natalia Kris Tri Atmoko, Yulius Kristian Tri Ayu Astira Ayu Silvia Febriani Ayuningrum, Yessy Azka Falaih Rizqiyana, Azka Falaih B. Sampurna Jaya, M. Thoha Bahar Triono Budi Legowo Budianto, Anwar Caswita Caswita Cherleyrian Ningsih Christa Evandini Cut Rohani Dapat Syahputra, Dapat Darmanto Darmanto Darmawi, Ahmad Darwanto Darwanto Daryanta Daryanta Deasy Vivta Rini Dedi Firmanto, Dedi Delima Sari, Irlani Aprida Desi Susanti Desy Mauliya, Desy Deviyanti Pangestu Devy Larasati Sukoco Dewi Sri Leni Indah DEWI WULANSARI Dhedy Handono Diah Nuraini Dian Erika Wati Diana Hariani dina rosita Doni Andeska Dumanika Rizky Bimasakti, Dumanika Rizky Dwi Ariyani Dwi Mawarti Dwi Setyo Putri, Ragil Dwi Yulia Sari, Dwi Yulia Dwinanda Harsa, Dwinanda Eddy Purnomo Edi Basuki Edy Purnomo Eka Dewi Nurjayanti Elsa Destriyani, Elsa Enden Sopa Sopiyana Eni Setianingsih Eny Lestari Erlina Rufaidah Erlyna Wida Riptanti Erni Mustakim Febra Anjar Kusuma, Febra Anjar Febrintina S, Dian Fenny Rita Fiantik, Fenny Rita Ferdesi Hanafia FITRI ANA Fitrianingsih Fitrianingsih Fitrihandayani, Anis Gusnetty Jayasinga, Gusnetty H., Yulina Habibatussolikhah, Annisa Titias Hambali Hambali Harsojo Harsojo Hastuti, Mistin Kusuma Hendry Susanto Heri Usmanto Heri Wahono herman, mey zulfia Herpratiwi Herpratiwi Hery Pratiknyo Hidayatullah Hidayatullah himmatul Aliyah, himmatul Hudawati, Deniq Hudayawan, Riza Nor Hurustiati Hurustiati Iding, Iding Ignatius Sulistyo Ika Santia Imam Widhiono Irawan Suntoro Irtanti Retno Astuti Iskandar Syah Iskandar, Sudrajat Ismiati Marfuah Rochmat, Ismiati Marfuah Jatmiko Jatmiko Jaya Wijaya JOKO SUSANTO Joko Sutrisno Juang Kurniawan Syahruzah Kartika, Leli Kesuma Wardani Kharisma Idola Arga Khasanah, Meyla Khumaida, Nosya Fachrizadini Kinayung, Satria Koesuma, Sorja Kosyi Hadi Prayogo, Kosyi Hadi Kusuma, Damar Yoga Kusumawardani, Zarra Aulia Lasri, Lasri Leny Marlina Lessie Novitasari, Lessie Lestari, Yulita Dwi Lia Dwi Arinda, Lia Dwi Linawati, Anissa Listanti, Sinta Nur Rizqi Loliyana Loliyana M Thoha BS Jaya, M Thoha M. Thoha B.S. Jaya M.Thoha B.S Jaya, M.Thoha B.S Made Sumarti Kardha Made Sumarti, Made Mardalena, Ni Nyoman Maria Claudia Karina Marsongko Marsongko, Marsongko Maryani Maryani Mastina, Lisda Metri Setyaning Komalasari Minar Ferichani Mirzan T. Razzak Mochamad Ibnu Harris, Mochamad Mohd. Harisudin Mugiadi Mugiadi Muhajir, Faisal Muhammad Fajar Maulana Muhammad Fathul Anwar, Muhammad Fathul Muhammad Iqbal Birsyada, Muhammad Iqbal Muhammad Oktavian Kristiana Muhammad Ramadhan Muji Desy Susanty Muncarno Muncarno Na’im, Azizun Zuhudatin Nazaruddin Wahab Nelly Astuti Ni Luh Ketut Shanti Antik Safitri, Ni Luh Ketut Shanti Antik Nia Susilo Wardani Noca Yolanda Sari Novia Ayu Puspitasari Nugroho, Novian Trio Nur Cahyonowati Nuraini, Tumang Nurhayat Nurhayat, Nurhayat Nurjayanti, .Eka Dewi Nurmalena, Nurmalena Nurudin Nurudin Octiara, Dwinta Ovita, Dhea Pamuji, Iska Aditya Pargito Pargito Parwono Parwono Prabowo, Hanif Imam Prama Handitya Wardhana Pramedita, Cindy Pujiati Pujiati Purnama Sari Putri Nurul Aini, Putri Nurul Putri Permatasari, Putri Putu Ayu Dahliawati R Gunawan Sudarmanto R. Gunawan Sudarmanto Raden Gunawan Sudarmanto Rahmat Diyanto, Rahmat Rahmawati, Shanti Eka Ramadhani, Achmad Rapani Rapani Ratri Dian Hestuningrum Ratri, Lintang Dianing Ravel, Ravel Rheza Rahadhitya, Rheza Rian Suryo Darmawan Rini Asnawati Risma Margaretha Sinaga Ristiana Ristiana Riswanti Rini Riyani Riyani Riyanto M. Taruna Riza Damayanti Rizky Agung Pratiwi, Rizky Agung Rizky Ariawan Ramadan, Rizky Roseanna Febriyani Rosmalina, Putu Rusdawati, Mala Rusmini, Rosalia Saefurrochman Saefurrochman Saifullah Saifullah Sanun Sanun, Sanun Saputro, Setiyawan Adi Sarengat Sarengat Sari Puspa Dewi, Sari Puspa Sari, Dwi Novita Sari, Ni Made Sukerti Satria Nugroho, Satria Sella Pramesta, Sella Septa Inda Yuli Septi Arianingsih Septianto, Rizki Serli Birlina, Serli Setyaningsih, Fitri Setyarso Herlambang, Setyarso Setyowati Setyowati Sibarani, Gianti Siddiq Dharmadi Siswanta, Siswanta Siswantoro Siswantoro Siswati Handayani Sisworo Sanjaya Siti Rachmah Siti Rachmah Sofiani Sitta Kurniawati Sowiyah Sowiyah Sri Lisdayeni, Sri sri marwanti Sri Maryati Sri Murniasih Sri Wahyuni Sucipto Sucipto Sudartoyo, Sudartoyo Sudjarwo Sudjarwo Sugara, Okinando Sugeng Pamudji Sugianti, Hanifah Feni Sugiarto Danu Sugiman Sugiman Sugiyanto Sugiyanto Suhardi Suhardi Suhardiansyah Suhardiansyah Suhartono Suhartono Sukana, Asep Sukirno Sukirno Sulistiasih Sulistiasih Sultan Djasmi SUMADI SUMADI Sunardi Sunardi Supanggyo Supanggyo Suprapti Supardi Suprapto Suprapto Supriyadi Supriyadi Suri, Ima Suripto Suripto Susi Wuri Ani Sutiarahmah, Ridha Suwarjo Suwarjo Suyamto Suyamto Syuaibah Yoswinda Floren, Syuaibah Yoswinda Taufik Taufik Tedi Rusman Tiara Nurbaiti, Tiara Tri Darmawati, Tri Trisnaningsih Trisnaningsih Tutut Zatmiko, Tutut Umi Salamah UT, Ika Wulandari Veridiana Eka Christy Vivi Novita Sari W Turnip, Purnama wahyuni wahyuni Wardaya Wardaya Wardhani, Ayu Pratiwi Kusuma Wati, Anis Ambar Wellfa Rina Hamer Wibowo, Hendri Wicaksana, Erza Ardenta Widodo, Dyah Winarni, Eka Ayu Tyas Windasari, Sri Wiwit Rahayu Yavina Nugrahanti Yayah Haenilah, Een Yohanie, Dian Devita YUDI PURWANTO Yulina Hamdan Yulina Hamdani Yulina Yulina Yusep Muslih Purwana Zainul Mubtadiin Zanah, Nur