4. Conclusion
Composite films based on PVA and lignin have been successfully fabricated with different
lignin contents, including 5 wt%, 15 wt%, 25 wt%, 35 wt%, and 45 wt%. SEM images show that
lignin particles are evenly distributed in the film structure. Due to the good interaction between
the
two phases, lignin and PVA in the composite, the mechanical properties of the films are
enhanced by adding the lignin if lignin content is not over 25%. The composite with a 25 wt%
lignin has the best mechanical properties with a tensile strength value of 62 MPa, much
higher
than that of a pristine PVA sample. In addition, the UV resistance of composite films is also
strengthened with the presence of lignin in the film. These results reveal that lignin is a potential
biomass
material, attracting a wide of many applications. Especially, PVA/lignin composite is
TNU Journal of Science and Technology
226(06): 3 - 9
http://jst.tnu.edu.vn 9 Email: jst@tnu.edu.vn
one of the outstanding applications due to its environmentally friendly features and high UV
resistance.
Acknowledgements: We acknowledge the technical support from the Faculty of Materials
Technology, Ho Chi Minh City University of Technology (HCMUT), VNUHCM for this study.
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