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All Journal ETAM: Jurnal Pengabdian kepada Masyarakat Jurnal Sains Materi Indonesia
Hermiyati, Indri
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Pengolahan Sampah Plastik Menjadi Ecobrick Stool Chair di Bank Sampah Bareng Mukti Saputra, Andri; Satwikanitya, Pani; Ellianto, Mario Sarisky Dwi; Pujiyanto, Risang; Hermiyati, Indri; Iswahyuni; Utami, Ratri Retno
Jurnal ETAM Vol. 4 No. 2 (2024): JUNE
Publisher : Politeknik Negeri Samarinda

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46964/etam.v4i2.723

Abstract

Sampah plastik di Kalurahan Sidomulyo, Bambanglipuro, Bantul belum dikelola dengan baik, sehingga menimbulkan penumpukan di Bank Sampah Bareng Mukti. Pelatihan ini bertujuan untuk mengedukasi masyarakat Kalurahan Sidomulyo terkait pengolahan sampah plastik menjadi ecobrick stool chair. Pelatihan dilakukan dengan metode sosialisasi dan praktik kepada 16 peserta anggota Bank Sampah Bareng Mukti dan masyarakat Kalurahan Sidomulyo. Evaluasi pelatihan dilakukan dengan metode angket menggunakan kuesioner. Hasil pelatihan menunjukkan bahwa peserta pelatihan mampu membuat ecobrick stool chair dari botol plastik bekas dan sampah plastik lainnya. Ecobrick stool chair disusun berdasarkan modul HexBench. Hasil evaluasi keterserapan materi yang disampaikan selama pelatihan menunjukkan bahwa terjadi peningkatan nilai rerata dari 82,25 (pretest) menjadi 96,06 (posttest). Rerata penilaian yang diberikan oleh peserta terkait materi dan performa instruktur secara keseluruhan adalah lebih dari 90 (sangat baik). Penilaian seluruh aspek kegiatan pelatihan oleh peserta terkait penyelenggaraan pelatihan menunjukkan hasilnya yang baik (rerata di atas nilai 4).
Study of the Effect of Ultraviolet Exposure Duration on Polypropylene Properties Saputra, Andri; Sitinjak, Tria Madeline; Warmiati; Hermiyati, Indri; Ratnaningsih, Wahyu; Hariyadi, Asful; Nurry, Dennis Farina
Jurnal Sains Materi Indonesia Vol. 27 No. 1 (2025): Jurnal Sains dan Materi Indonesia
Publisher : BRIN Publishing (Penerbit BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/jsmi.2025.8959

Abstract

Prolonged exposure to ultraviolet (UV) radiation significantly alters the chemical, thermal, and mechanical properties of polypropylene (PP), leading to degradation and reduced material performance. This study aims to investigate the effect of exposure length to UV on the chemical properties (functional and thermal) and mechanical properties (tensile strength) of PP. Specimens were subjected to UV exposure for 0 (control), 125, 175, 225, 275, 325, 375, and 625 days. FTIR analysis indicates UV exposure chemically degrades polypropylene (PP) by generating new oxygenated groups (–OH and C=O at 3368 cm⁻¹ and 1586 cm⁻¹) and damaging its main molecular structure (C-H at 2949 cm⁻¹, 2867 cm⁻¹, and 841 cm⁻¹). Prolonged UV exposure alters the thermal properties of polypropylene (PP), as indicated by DSC analysis, which shows broadening and shifting of the melting peak (175–180 °C) due to crystallinity changes and increased oxidation. The mechanical properties also deteriorate, with a critical reduction in tensile strength, particularly between 225 and 375 days, indicating an accelerated degradation phase. After 625 days, tensile strength declines by approximately 59%, confirming the substantial impact of extended UV exposure on PP’s durability.
Co-Authors Hariyadi, Asful Iswahyuni Mario Sarisky Dwi Ellianto Nurry, Dennis Farina Nurwijayanti Pujiyanto, Risang Ratnaningsih, Wahyu Ratri Retno Utami RR. Ella Evrita Hestiandari Satwikanitya, Pani Sitinjak, Tria Madeline Warmiati