Electronic Theses and Dissertation

Ampas kopi merupakan limbah organik yang berpotensi dimanfaatkan sebagai filler pada film komposit berbasis Polyvinyl Alcohol (PVA) untuk menghasilkan material yang lebih ramah lingkungan. Penelitian ini bertujuan menganalisis pengaruh perlakuan kimia berupa alkalisasi menggunakan larutan NaOH dan hidrolisis asam menggunakan larutan H2SO4 terhadap kekuatan tarik dan ketahanan sobek film komposit berbasis PVA dan ampas kopi. Film komposit dibuat menggunakan metode casting dan evaporasi, dengan variasi kadar filler ampas kopi sebesar 5%, 10%, dan 15%, baik tanpa perlakuan maupun dengan perlakuan kimia. Karakterisasi dilakukan melalui pengamatan visual, pengujian tarik, dan pengujian sobek. Hasil penelitian menunjukkan bahwa komposit dengan filler tanpa perlakuan memberikan performa terbaik dibandingkan perlakuan alkalisasi dan hidrolisis. Nilai kekuatan tarik tertinggi diperoleh pada variasi PVA/AK-NP-10 sebesar 9,667 MPa, sedangkan nilai terendah pada PVA/AK-Alk-5 sebesar 1,693 MPa. Pada pengujian sobek, nilai ketahanan sobek tertinggi diperoleh pada variasi PVA/AK-NP-15 sebesar 9,494 N, sedangkan nilai terendah pada PVA/AK-Alk-5 sebesar 2,475 N. Perlakuan alkalisasi dan hidrolisis cenderung menurunkan sifat mekanik akibat perubahan struktur filler yang memengaruhi interaksi antara filler dan matriks PVA.

Kata kunci: Ampas Kopi, Polyvinyl Alcohol (PVA), Film Komposit, Kekuatan Tarik, Ketahanan Sobek

Spent coffee grounds are an organic waste material with the potential to serve as a filler in Polyvinyl Alcohol (PVA)-based composite films, creating a more environmentally friendly material. This study aimed to analyze the effects of chemical treatments—specifically alkalization using NaOH solution and acid hydrolysis using H2SO4 solution—on the tensile strength and tear resistance of PVA/spent coffee ground composite films. The composite films were fabricated using a casting and evaporation method, with spent coffee ground filler contents varying at 5%, 10%, and 15%, utilizing both untreated and chemically treated fillers. Characterization was conducted through visual observation, tensile testing, and tear testing. The results indicated that composites containing untreated filler exhibited superior performance compared to those with alkalization or hydrolysis treatments. The highest tensile strength (9.667 MPa) was observed in the PVA/AK-NP-10 variant, while the lowest (1.693 MPa) was found in the PVA/AK-Alk-5 variant. Regarding tear resistance, the highest value (9.494 N) was obtained with the PVA/AK-NP-15 variant, and the lowest (2.475 N) with the PVA/AK-Alk-5 variant. Alkalization and hydrolysis treatments tended to reduce mechanical properties due to structural changes in the filler that affected the interaction between the filler and the PVA matrix. Keywords: Spent Coffee Grounds, Polyvinyl Alcohol (PVA), Composite Film, Tensile Strength, Tear Resistance