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Journal : Sainteknol : Jurnal Sains dan Teknologi

Density–Porosity Interplay in Epoxy‑Based Syntactic Foams Reinforced with K15 Glass‑Silica Microballoons Hidyus, Sofi Alifia; Budiwirawan, Agung; Musyono, Ari Dwi Nur Indriawan; Setiadi, Rizky; Bunyamin, Bunyamin
Sainteknol : Jurnal Sains dan Teknologi Vol. 23 No. 2 (2025): December 2025
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sainteknol.v23i2.23886

Abstract

Syntactic foam is a lightweight, high‑strength composite consisting of a polymer matrix filled with hollow microspheres (microballoons). This study examines how the volume fraction of glass‑clad silica microballoons K15 (10–50 vol %) affects the density, porosity, and void distribution of epoxy‑bonded syntactic foams. Specimens were molded in accordance with ASTM D790, conditioned for 48 h (23 ± 2 °C; 50  ±  5 % RH), and their density was measured by the pycnometric method specified in ASTM D792. Porosity was calculated theoretically and validated by SEM–EDS imaging of fracture cross‑sections. Results show a linear decrease in density from 1.15 g cm⁻³ (0 vol %) to 0.63 g cm⁻³ (50 vol %), while porosity rises exponentially from 2.7 % to 18.4 %. Morphological analysis confirms a homogeneous microballoon dispersion up to 30 vol %, but agglomeration and interbinder voids appear above 40 vol %, leading to uncontrolled porosity. A strong negative correlation (R² = 0.96) is observed between density and effective porosity. A 30 vol % K15 loading is identified as the optimum, achieving a 28 % density reduction without a significant porosity spike. These findings provide a basis for designing sandwich cores and amphibious flotation structures that require high strength‑to‑weight ratios.
Co-Authors Abdillah, Tiara Firdausa Abdul Djohar Abdullah, Mohd Kamarulnizam Abubakar Idham Madani Afif, Moh. Noor Agung Budiwirawan Agus Yuwono AGUSTIANI, Elvi Ahmad Dahlan Ahmad, Mubarak Akhilia, Tudrika Al-Mughni, Muhammad Al-Saffar, Zaid Hazim Alamsyah Agit Alfarel, Ahmad Alimin Alimin, Alimin Amin, Aminul Amirullah -, Amirullah Andi Hadidu Andi Syarifuddin Andiani, Lidia Anfal, Wahyuddin Anggun Anggun, Anggun Anjaryani, Siwi Anshari Nur, Muh. Nadzirin Arbi, Yaumal Ardi Kemara, Nicholas Ariansyah, Dedek Arifana, Arifana Arifin, Desi Lina Atik Yuliyani Atmajaningati, Atmajaningati Awaluddin Hamzah Bahri, Robi Asadul Bahri, Robi Assadul Bima Ramadhan, Novrianto Buana, Tjandra Budiansyah, Dadan Bulan, Yunita Embong Chikam, David Badi’ul Chodir, Fatkul Chusnul Chotimah Dayunita, Wilda Dearanti, Muti Dima, Darsilan Dirwan Dirwan Djoko Sugiono Dwi Aryani, Dwi Dwi Nita Aryani Dwi Widjanarko Dyah Nugrahani Erlangga, Gery Erlinawati, Eli Evi Maria Evi Sopandi, Evi Fakhruddin Fakhruddin FASIKHI, Fasikhi Fauzi, Noor Ali Fhira Nhita Firdaus Arifin, Firdaus Gazali, Agus Umar Ginanjar, Bagus Gumilang, Randi Muhammad Hadi, Wahono Hadromi - HAKIM, Sherly Nur Hanif Mauludin Hardanang, Rosyid Wahyu Hariadi, Sugeng Harianingsih, Harianingsih Harry, Aulia Hartina Batoa Hasan, Otie DS Hedher Tuakia Hendrifa, Nesri Heri Yudiono Herian Syaputra, Novriza Hery Widijanto Hidayat, Erik Hidayat, Hanif Hidayati, Wiwik Hidyus, Sofi Alifia I Made Sudana Ibrahim Ibrahim Idris Rasyid, Idris Idroes, Imransyah Ihsana El Khuluqo Imama Zuchroh Indah Nastiti, Tashia Ionia Veritawati Irma Irma Irmayanti Irmayanti, Irmayanti Istutik Jaya, Ramadhansyah Putra Jayadisastra, Yoenita Junior, Rizkindo Kadarusman . Kaddas, Badruddin Kallang, Abdul Khusaeni, Khusaeni khusnul khotimah Kusnanto, Anang Amir La Ode Ali Imran, La Ode Ali Laila, Rika Noor Lating, Noval Ali Lindawati Lindawati Maarif, Ihsanul Maharani Kusumaningrum Margareta Rahayuningsih Nugroho Edi K Margunani, Margunani Mariamah Mariamah Maryanto - Masruki, Rosnia Mohammad Syadeli Muhammad Arifin Rahmanto Muhammad Ridha Muhtarom, Herdin Mujahidin Mujahidin Mujahidin Mujahidin Muksin Muksin MULJONO, Hery Munfariqoh, Siti Muniroh, Muniroh Munirul Hady Murbani, Anastasia Wahyu Muslichah Muslichah Muslim Tadjuddah Musyono, Ari Dwi Nur Indriawan N, Isna Oriza Nabila, Dinda Indah Nabila, Gina Nasser, Gamal A Nasser, Gamal Abdel Nastiti, Tashia Indah Nasution, Maneger Nawawi, Muhammad Azhar Ngurah Ayu Nyoman Murniati Norholis, Norholis Nunung Nurastuti, Nunung Nurfaidah Nurfaidah Nurjanah, Aan Siti Nursyamsiah, Nursyamsiah Nurwati, Dian Pamungkas, Hawinda Dwi Permatasari, Nina Prajoga, Uke Pramanda, Heru Pranata, Willy Pratama, Cahya Adhitya Pratiwi, Ayu Kurnia Primansyah, Anas Pulungan, Nurfazri Purwanti, Rahayu Endah Rahmanto, Muhammad Arifin Rahmawati, Rahmawati Rasdi Ekosiswoyo Rasiman Rasiman Reza P. Munirwan Rina Irawati Rina Rahmawati, Rina Rizqi Fitri Naryanto Rorimpandey, Thalia Rosmawati Rosmawati Rudiansyah, Riky Rusdiah Rusdiah Ruslan, Ahmad Safi’i, Imam Sahabuddin Hay, Sahabuddin Salamah, Siti Afiyatus Salehuddin, Mohammad Samsudi . Sani, Wan Noor Hin Mior SARAWA MAMMA, SARAWA Sari, Andria Sarifa Suhra Satir, Muhammad Sa’adah, Lailatus Selly Meliana Septiyanto, Angga Setiawan Setiawan Setyawan, Setyawan Sherly Hesti Erawati Silviana, Mery Sintha Wahjusaputri, Sintha Siti Munfaqiroh Sitti Syahar Inayah Siwi Dyah Ratnasari Somariah Fitriani Sonhaji Sonhaji Sri Sumartiningsih Subagyo, Tatang Suharmoko, Suharmoko Sukmawati Abdullah Sunarto Sunarto Suriana Suriana Surip Surip Suryani, Erlis Sutarni, Sutarni Syamsul Bahri Syukri Syukri Tachrir, Tachrir Taufan, Syafriandani Irgayansah Taufik, Yani Tjahjani, Fera Tri Joko Raharjo Triana Murtiningtyas Umar Sulaiman Umma, Rachmatul Umrah, St Utami, Nunung Nurastuti Wahyu Mahendra Wati Sukmawati Wianti, Nur Isiyana WIDANARNI WIDANARNI Widi Widayat Widiastuti, C. Tri Widya Kusumaningsih Widyaningtyas, Arista Wihartati, Ayu Wunawarsih, Ima Astuty Yanto, Muhammad Arrry YULIASIH, Tanti Yupono Bagyo Yuyuk Liana Zainul Arifin