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<p>Mitigation of outgassing from organic polymeric components is crucial for safeguarding high-sensitivity spacecraft optics. In this study, the outgassing characteristics of three bamboo-derived cellulose nanofiber (CNF) films with different residual hemicellulose and lignin concentrations, namely CNF, CNF-containing hemicellulose (HCNF), and lignin- and hemicellulose-containing CNF (LHCNF), which are natural polymeric materials, were investigated. The outgassing rates, which were determined in accordance with ASTM E1559, were analyzed using a one-dimensional two-component diffusion model. CNF and HCNF released only water, whereas LHCNF emitted trace quantities of lignin-derived volatiles in addition to water. Nevertheless, the total contaminant contents of CNF and LHCNF were an order of magnitude below the 0.1% threshold specified in ASTM E595, indicating their suitability for most space applications. For missions demanding the lowest absolute contamination levels, further lignin removal can reduce volatile condensable materials by an additional order of magnitude. The bamboo-to-LHCNF production pathway offers a scalable method for purifying plant-based materials for spacecraft integration.</p>

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Outgassing properties of bamboo-derived cellulose nanofiber sheets containing hemicellulose and lignin evaluated by ASTM E1559 for space applications

  • 期刊论文

  • 发表日期：

    2026年1月5日

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  • Naoki Shimosako,
  • Eiji Miyazaki,
  • Yukino Masuda,
  • Keisuke Tojo,
  • Miki Matsuoka,
  • Masaya Moriyama,
  • Taro Kinumoto

摘要

Mitigation of outgassing from organic polymeric components is crucial for safeguarding high-sensitivity spacecraft optics. In this study, the outgassing characteristics of three bamboo-derived cellulose nanofiber (CNF) films with different residual hemicellulose and lignin concentrations, namely CNF, CNF-containing hemicellulose (HCNF), and lignin- and hemicellulose-containing CNF (LHCNF), which are natural polymeric materials, were investigated. The outgassing rates, which were determined in accordance with ASTM E1559, were analyzed using a one-dimensional two-component diffusion model. CNF and HCNF released only water, whereas LHCNF emitted trace quantities of lignin-derived volatiles in addition to water. Nevertheless, the total contaminant contents of CNF and LHCNF were an order of magnitude below the 0.1% threshold specified in ASTM E595, indicating their suitability for most space applications. For missions demanding the lowest absolute contamination levels, further lignin removal can reduce volatile condensable materials by an additional order of magnitude. The bamboo-to-LHCNF production pathway offers a scalable method for purifying plant-based materials for spacecraft integration.