Green design of biodegradable packaging films via renewable coffee waste and PVA matrix tuning
再生可能なコーヒー廃棄物とPVAマトリックス調整による生分解性包装フィルムのグリーン設計 (AI 翻訳)
E. Supriyanto, Muhammad Rizky Ramadhani, D. Sabda, B. Prasetya, Stefano Akbar, Sri Subekti, A. F. Sunartomo, K. Triyana
🤖 gxceed AI 要約
日本語
本研究では、ポリビニルアルコール（PVA）と廃コーヒーかす（SCG）から生分解性複合フィルムを水溶液キャスト法で作製し、PVA濃度（6-14% w/v）がフィルムの構造、熱特性、力学特性に与える影響を調査。12%PVAで最適な強度と柔軟性を達成し、最大引張強度1.70 MPa、破断伸び889%を示した。本成果は、廃コーヒーかすを再生可能な強化材として活用する循環型包装材料の可能性を示す。
English
This study fabricated biodegradable composite films from poly(vinyl alcohol) (PVA) and spent coffee grounds (SCG) via water-based solution casting, investigating the effect of PVA concentration (6–14% w/v). The optimal formulation at 12% PVA achieved a tensile strength of 1.70 MPa and elongation at break of 889%, demonstrating the potential of SCG as a renewable reinforcement for sustainable packaging.
Unofficial AI-generated summary based on the public title and abstract. Not an official translation.
📝 gxceed 編集解説 — Why this matters
日本のGX文脈において
日本では食品廃棄物の削減とプラスチック代替材料の開発が進んでおり、本研究成果はコーヒーかすの有効活用と生分解性包装の実用化に寄与する可能性がある。ただし、GX（グリーントランスフォーメーション）の文脈では、直接的な温暖化対策よりも資源循環の側面が強い。
In the global GX context
Globally, the shift toward biodegradable packaging is a key sustainability trend. This paper contributes to circular economy by valorizing coffee waste, but its direct relevance to GX (climate disclosure, carbon pricing, etc.) is limited. It offers insights for material scientists working on bio-based composites.
👥 読者別の含意
🔬研究者:Materials scientists can use the findings to optimize polymer-filler systems for biodegradable packaging.
🏢実務担当者:Packaging manufacturers may consider SCG as a low-cost renewable filler for PVA films.
🏛政策担当者:Waste management policymakers can note the potential for coffee ground valorization in packaging applications.
📄 Abstract（原文）
Biodegradable packaging materials derived from renewable resources have attracted increasing attention as sustainable alternatives to conventional petroleum-based plastics. In this study, biodegradable composite films based on poly(vinyl alcohol) (PVA) reinforced with spent coffee grounds (SCG), an abundant agro-industrial waste, were successfully fabricated via a simple and environmentally benign water-based solution casting method. The effect of PVA matrix concentration (6–14% w/v) was systematically investigated to elucidate its role as a key structural parameter governing film formation, intermolecular interactions, thermal behaviour, and mechanical performance. Fourier transform infrared (FTIR) analysis provided direct evidence of hydroxyl-driven intermolecular interactions between PVA chains and lignocellulosic components of SCG, confirming the formation of hydrogen-bonded networks within the composite films. Thermogravimetric analysis (TGA) revealed a predictable multi-step degradation mechanism, with the main decomposition occurring between 250 and 500 °C and the formation of residual carbonaceous char at higher temperatures due to lignin-rich SCG fractions. Differential scanning calorimetry (DSC) showed a distinct melting transition around 170 °C and a degradation-related thermal event above 300 °C, indicating that crystalline domains and melting stability of PVA were preserved after SCG incorporation. Mechanical testing demonstrated that PVA concentration strongly influenced tensile behaviour. The composite films exhibited ductile deformation with high elongation at break (300–890%). An optimum formulation was identified at 12% PVA, which achieved the best balance between strength and flexibility, reaching a maximum tensile strength of 1.70 MPa and elongation at break of 889%. At higher PVA concentration (14%), excessive solution viscosity reduced filler dispersion homogeneity, leading to a slight decrease in tensile strength while maintaining high flexibility. Overall, this work highlights the importance of polymer matrix concentration as a critical design parameter beyond filler loading alone and demonstrates the potential of spent coffee grounds as a renewable, circular-economy reinforcement for sustainable PVA-based biodegradable packaging films.
🔗 Provenance — このレコードを発見したソース
- semanticscholar https://doi.org/10.1039/d5ra08990efirst seen 2026-05-15 19:50:56 · last seen 2026-06-16 05:09:24
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