使用済みPETのアップサイクルによるバイオ改質不飽和ポリエステル樹脂を用いた低炭素・耐候性ヘンプ繊維複合材料
Upcycling Post-Consumer PET into Bio-Modified Unsaturated Polyester Resins for Low-Carbon, Weather-Durable Hemp-Fiber Composites (原題)
Jirapa Rueangsuwan, Yanin Tangkaravakoon, Hatairat Leekmek, Suporn Lelatasnatorn, Paphawee Chawalitsirisate, Supakij Suttiruengwong
🤖 gxceed AI 要約
日本語
使用済みPETをグリコリシス・ポリエステル化により不飽和ポリエステル樹脂へアップサイクルし、ヘンプ繊維で強化した複合材料を試作した。バイオ由来1,3-プロパンジオール（bPDO）の導入で分子量増加と耐候性・熱緩衝性の向上が見られ、衝撃強度は5倍以上に向上。化石由来樹脂比で炭素フットプリントを約16%削減し、屋外用途向けの低炭素・高耐久材料の可能性を示した。
English
Post-consumer PET was upcycled via glycolysis–polyesterification into unsaturated polyester resins using five polyol systems, then reinforced with woven hemp fibers. Bio-based 1,3-propanediol (bPDO) formulations raised molecular weight, impact strength (>5x), weathering durability, and thermal buffering. bPDO composites cut calculated carbon footprint by ~16% versus fossil-based resin, showing promise for durable, lower-carbon outdoor materials.
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
日本ではプラスチック資源循環法や自動車・建材分野のリサイクル材採用が進む。本紙はリサイクルPETとバイオ素材を組み合わせた材料設計の実例として、Scope 3削減や循環調達を検討する製造業の参考になる。ただし開示制度や政策への直接的な示唆は限定的。
In the global GX context
Material-level decarbonization evidence like this feeds into Scope 3 accounting and circular-economy claims under CSRD/ISSB, where recycled and bio-based content increasingly requires verifiable data (e.g., radiocarbon-based biogenic carbon). It offers a concrete case of combining PCR feedstock with bio-based polyols to lower embodied carbon in composites.
👥 読者別の含意
🔬研究者:リサイクルPET由来樹脂のポリオール系が分子量・耐候性・炭素フットプリントに与える影響を比較した材料設計データとして有用。
🏢実務担当者:屋外用途の複合材料でリサイクル・バイオ原料を採用し、Scope 3や循環調達の主張を裏付ける材料選定の参考になる。
🏛政策担当者:プラスチック循環・バイオマス材の普及政策において、リサイクル原料とバイオ原料の組み合わせが実際に炭素削減と耐久性を両立し得る事例として参照可能。
📄 Abstract（原文）
Abstract The transition toward circular and low-carbon materials demands strategies that recover post-consumer polymers while transforming them into higher-value, longer-life products. In this work, post-consumer recycled poly(ethylene terephthalate) (PCRPET) was used as a feedstock for unsaturated polyester resins via glycolysis–polyesterification using five polyol systems: propylene glycol (PG), diethylene glycol (DEG), bio-based 1,3-propanediol (bPDO), bPDO/PG, and bPDO/DEG. The resulting resins were reinforced with woven hemp fibers at a resin-to-fiber ratio of 80:20 (w/w, six plies) to produce composite laminates, which were evaluated for mechanical performance, accelerated weathering durability (QUV, up to 1000 h), outdoor thermal behavior, and carbon footprint. Glycolysis yielded structurally comparable hydroxyl-terminated oligomers across all polyol systems. During polyesterification, bPDO promoted chain growth, resulting in higher molecular weights, broader dispersity, and more heterogeneous crosslink density. Woven hemp fiber increased impact strength by more than fivefold across all formulations. UPR_bPDO_hemp fiber achieved the highest impact strength (6.39 ± 0.79 kJ/m2), exceeding the fossil-based reference composite, while UPR_bPDO/DEG_hemp fiber showed the most favorable flexural strength retention during prolonged QUV exposure. All bPDO-containing composites exhibited superior thermal buffering relative to the PG-only system, with peak temperature differences of up to 5.5 °C at noon. bPDO incorporation provided a nominal bio-based polyol content of up to 21.3 wt % and a radiocarbon-measured bio-based carbon fraction (Percent Modern Carbon) of 14.88 ± 0.25% for UPR_bPDO, while reducing the calculated CF by approximately 16% relative to the fossil-based neat resin reference. These results demonstrate the potential of PCRPET-derived, bio-modified hemp composites as durable, lower-carbon materials for outdoor applications.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.1021/acspolymersau.6c00175first seen 2026-09-11 05:03:09
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