Journal
FRONTIERS IN CHEMISTRY
Volume 8, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fchem.2020.00068
Keywords
cellulose nanofiber; thermal expansion; anisotropy; film; nanopaper
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Funding
- JST-Mirai RD Program [JPMJMI17ED]
- JSPS [17K15298]
- Grants-in-Aid for Scientific Research [17K15298] Funding Source: KAKEN
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We report the anisotropic thermal expansion of a transparent nanopaper structure comprising cellulose nanofibers (CNFs). The coefficient of thermal expansion (CTE) of the nanopaper in the out-of-plane direction was 44.6 ppm/degrees C in the temperature range of 25-100 degrees C, which is approximately five times larger than its CTE in the in-plane direction in the same temperature range (8.3 ppm/degrees C). Such a strong anisotropy in thermal expansion is mainly attributable to the anisotropic CTE values of single CNFs in the fiber axis and cross-sectional directions. We observed anisotropic thermal expansion even in a bioplastic composite containing only 2.5% w/w CNFs.
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