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Lisyanto .
Universitas Negeri Medan
Agriculture, Biological Sciences & Forestry Arts Humanities Automotive Engineering Control & Systems Engineering Education Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mechanical Engineering Social Sciences Other

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Uniaxial and biaxial hot pressing of PVDF films: A pathway toward high-performance piezoelectric sensors and energy harvesters Suprapto Suprapto; Jubaidah jubaidah; Selamat Triono; Harianto Gunawan; Lisyanto Lisyanto; Aditya Sukma Nugraha; Yopan rahmad Aldori
Teknomekanik Vol. 9 No. 1 (2026): Regular Issue
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/teknomekanik.v9i1.44972

Abstract

The piezoelectric efficiency of Poly (vinylidene fluoride) (PVDF) membranes becomes restricted by the challenge of generating and stabilizing electroactive β-phase during processing. Stretching requires control of deformation parameter, while solvent-based methods bring environmental and occupational health risks. This research suggests hot-pressing as an alternative method for enhancing β-phase fraction, utilizing multidirectional stress without solvent or chemical exposure. This study systematically compares uniaxial hot-pressing (Uniaxial HP) and biaxial hot-pressing (Biaxial HP) setups to determine which stress distribution is more effective at promoting changes and improving piezoelectric properties in PVDF membranes. The main objective of this research is to systematically evaluate and compare the impacts of uniaxial and biaxial hot-pressing on the crystalline phase transformation and electromechanical performance, including the piezoelectric coefficient (d33) and output voltage response of PVDF membranes. PVDF pellets were hot-pressed at 220o C under a pressure of 60 MPa for 15 minutes followed by rapid quenching in ice water. X-Ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) confirmed phase composition, correlated with performance via the piezoelectric coefficient (d33), and assessed piezoelectric activity. Experimental results show that biaxial loading provides a higher b-phase fraction (50.47%) compared to untreated membranes (47.80%) and UHP samples (49.30%). The crystallinity and the piezoelectric coefficient also increased to 49% and 18.8 pC/N, respectively. Biaxial stress pattern during hot-pressing induces favourable thermodynamic and kinetic conditions for b-phase expansion. Beyond phase-related results, the approach delivers competitive piezoelectric effectiveness while maintaining simplicity and reducing solvent-dependent processing steps.
PENERAPAN TEKNOLOGI TEPAT GUNA CHOPPER BLENDER PENGOLAHAN PAKAN TERNAK DI DESA KLAMBIR LIMA, KECAMATAN HAMPARAN PERAK Suprapto Suprapto; Jubaidah Jubaidah; Lisyanto Lisyanto; Henry Iskandar; Binsar Panjaitan; Selamat Riadi; Yopan Aldori
Martabe : Jurnal Pengabdian Kepada Masyarakat Vol 8, No 8 (2025): MARTABE : JURNAL PENGABDIAN KEPADA MASYARAKAT
Publisher : Universitas Muhammadiyah Tapanuli Selatan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31604/jpm.v8i8.%p

Abstract

Pemanfaatan limbah pertanian dan perkebunan di pedesaan seringkali masih belum optimal, padahal memiliki potensi signifikan sebagai sumber pakan ternak alternatif. Permasalahan yang dihadapi mitra yaitu pakan hijau yang tidak tercacah sempurna  sering terbuang percuma, biaya pakan konsentrat tinggi, serta ketiadaan mesin pencacah. Pengabdian kepada masyarakat (PKM) ini bertujuan untuk meningkatkan efisiensi pengolahan pakan ternak melalui penerapan mesin Chopper Blender Teknologi Tepat Guna (MTTG-CB). Metode pelaksanaan kegiatan meliputi observasi, desain dan fabrikasi mesin, pelatihan operasional dan perawatan, uji coba lapangan, dan pendampingan teknis. Hasil implementasi MTTG-CB mampu mencacah 100 kg pakan hijauan dalam ±30 menit dengan ukuran 2-5 cm. Pelatihan dan pendampingan berhasil meningkatkan keterampilan mitra dalam penggunaan dan perawatan mesin. Melalui pemanfaatan limbah lokal, mitra dapat menghemat waktu dan menekan biaya pakan hingga 40%. Kegiatan ini terbukti meningkatkan efisiensi dan produktivitas peternak, serta berpotensi besar untuk direplikasi oleh peternak lain dalam mendukung ketahanan pangan berbasis lokal.
Co-Authors Adek Cerah Kurnia Azis Aditya Sukma Nugraha Andri Zainal Anjar Suprapto Anjar Suprapto, Anjar Binsar Panjaitan Dwiki Muda Yulanto E Namaken Sembiring E. Namaken Sembiring Eswanto, Eswanto Gunawan, Harianto Gunawan, Safri Harianto Gunawan HENRY ISKANDAR Hidir Efendi I Dewa Made Subrata I Nengah Suastawa Jubaidah jubaidah Jubaidah Jubaidah Jubaidah, Jubaidah M H Bintoro Djoefrie M.Sjahrul Annas Muhtadin Muhtadin Nur Basuki Pasca Dwi Putra Radite P A Setiawan Safri Gunawan Selamat Riadi Selamat Riadi Selamat Triono Selamat Triono Selamat Triono, Selamat Siti Ulgari Situmorang, Mariaman Suhermanto Agung Wibowo Sukma Aditya Suprapto Suprapto Suprapto Suprapto Suprapto Suprapto Wibowo, Suhermanto Agung Yopan Aldori Yopan Rahmad Aldori