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| Study on Preparation and Barrier Properties of Nanocellulose/Biodegradable Plastic Two-layer Composite Films |
| Received:May 29, 2026 Revised:June 09, 2026 |
| DOI：10.11981/j.issn.1000-6842.2026.03.90 |
| Key Words:nanocellulose;biodegradable plastic;two-layer composite film;high-barrier;food packaging |
| Fund Project:国家重点研发计划2023YFD22014国家自然科学基金22378023国家重点研发计划（2023YFD22014）；国家自然科学基金（22378023）。 |
| Author Name | Affiliation | Postcode | | Yuan Zihui* | School of Materials Science and Technology， Beijing Forestry University， Beijing， 100083 | 100083 | | Wang Yu | School of Materials Science and Technology， Beijing Forestry University， Beijing， 100083 | 100083 | | Zhang Wansong | School of Materials Science and Technology， Beijing Forestry University， Beijing， 100083 | 100083 | | Chen Sheng* | School of Materials Science and Technology， Beijing Forestry University， Beijing， 100083 | 100083 | | Xu Feng | School of Materials Science and Technology， Beijing Forestry University， Beijing， 100083 | 100083 |
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| Abstract: |
| In this study， TOCNF/SCNC blended films were prepared via solution casting using 2，2，6，6-tetramethylpiperidine-1-oxyl-oxidized cellulose nanofibrils （TOCNF） as the matrix and stearoylated cellulose nanocrystals （SCNC） as the functional nanofiller. These TOCNF/SCNC blended films were then combined with poly(butylene adipate-co-terephthalate)/polylactic acid （PBAT/PLA） blended films through a hot-pressing process to fabricate nanocellulose/biodegradable plastic two-layer composite films. The effects of SCNC mass fraction on the micromorphology， thermal stability， surface wettability， transparency， and gas barrier properties of the two-layer composite films were investigated. The results indicated that the long-chain alkyl groups on the SCNC surface were embedded into the PBAT/PLA network during hot-pressing， which enhanced the interfacial adhesion between the two blended film layers. The two-layer composite films exhibited a tensile strength of 6.4 MPa and possessed good thermal stability. At the same time， the two-layer composite films exhibited excellent gas barrier properties， with an oxygen transmission rate as low as 1.06×10-4 cm3/(m2·d·Pa) and a water vapor transmission of only 127 g/(m2·24 h). Furthermore， the two-layer composite films demonstrated an outstanding preservation effect when used for grape packaging. |
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