Synergistic enhancement of gas barrier and aging resistance for biodegradable films with aligned graphene nanosheets

Jiaxu Li, Songlin Wang, Lei Lai, Pingwei Liu, Haiqiang Wu, Jinlong Xu, Steven J. Severtson, Wen Jun Wang

Research output: Contribution to journalArticlepeer-review

27 Scopus citations


There is currently great interest in biodegradable alternatives for packaging and agricultural applications. The most viable biodegradable alternative, poly (butylene adipate-co-terephthalate) (PBAT), has poor resistance to water vapor and oxygen permeation and tends to degrade rapidly under solar exposure. Herein, we report a preparation of PBAT nanocomposite films with aligned graphene nanosheets both in and on the films by combining two techniques, biaxial orientation and rod scarping. The composite films with a graphene content of 0.48 vol% exhibited 80% decrease of water vapor permeability and over 99% decrease of oxygen permeability, approaching values of 1.0 × 10−11 g m m−2·Pa−1 s−1 and 6.2 × 10−16 cm3 cm cm−2·Pa−1 s−1. These values are respectively comparable to and even lower than the reported 9.9 × 10−12 g m m−2·Pa−1 s−1 and 8.0 × 10−15 cm3 cm cm−2·Pa−1 s−1 for polyethylene films. After a 200 h aging, the composite films still possessed a fracture strength of 47.3 MPa and an elongation at break of 167%, in contrast to a complete fragmentation of pure PBAT. We believe that the controlled incorporation of aligned graphene nanosheets to biodegradable polymers could become an important strategy to develop sustainable packaging and agricultural films.

Original languageEnglish (US)
Pages (from-to)31-40
Number of pages10
StatePublished - Feb 1 2021

Bibliographical note

Funding Information:
We are grateful for financial support from the National Key Research and Development Program of China ( 2016YFB0302400 ), National Natural Science Foundation of China ( 21938010 , 51903218 , 21536011 , and 2197080461 ), Zhejiang Provincial Natural Science Foundation ( LR20B060002 ), State Key Laboratory of Chemical Engineering at Zhejiang University ( SKLChE-19D02 and SKL-ChE-19T03 ), Institute of Zhejiang University – Quzhou ( IZQ2019-KJ-010 and IZQ2019-KJ-015 ), and Zhejiang Hengyi Petrochemicals Co. Ltd ( HY20190101 ). We thank Mrs. Sudan Shen, Mrs. Li Xu, Mrs. Na Zheng and Mrs. Qun Pu for their assistances in performing TEM, thermal analysis, Raman spectroscopy, and tensile test at State Key Laboratory of Chemical Engineering at Zhejiang University.

Publisher Copyright:
© 2020 Elsevier Ltd


  • Aging resistance
  • Barrier properties
  • Biaxial orientation
  • Biodegradable polymer film
  • Graphene
  • Nanocomposite
  • Rod scraping


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