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Low-temperature thermal drying-induced pore expansion effects of cellulosic fibers

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Abstract

Thermal drying makes cellulosic fibers shrink, resulting in pore collapse and degraded fiber performance. However, in this work, the pores of cellulose fibers expanded in the later stage of low-temperature thermal drying by regulating the fiber stacked structure before drying, which was called “low-temperature pore expansion effects”. The results showed a high content of lignin was required because there were no low-temperature pore expansion effects during the drying process of low lignin-containing cellulosic fibers. Three-dimensional fiber stacked structure was also necessary because cellulose fiber materials with two-dimensional stacked structure, such as paper, had no pore expansion effects. The pore expansion effects first strengthened and then weakened with increasing temperature, and the optimum temperature was 60 °C. According to the results, the pore expansion effects included the pore shrinkage period and pore expansion period. Finally, a possible lignin-cellulose phase separation mechanism was proposed to explain this phenomenon. This work reveals the special ultrastructural transformation of cellulosic fibers under low-temperature drying, providing a reference for precise regulation of the properties of dried fibers.

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The data that support the findings of this study are available from the corresponding authors on reasonable request.

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Funding

This work was supported by Natural Science Foundation of Guangdong Province [Grant Number 2021A1515011012]; R&D projects in key areas of Guangdong Province [Grant Number 2022B1111080004]; High Performance Servo System Enterprise Key Laboratory of Guangdong [Grant Number HPSKL2022KT01].

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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by WM. The first draft of the manuscript was written by WM and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Bo Li.

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Mo, W., Li, B. & Chen, K. Low-temperature thermal drying-induced pore expansion effects of cellulosic fibers. Cellulose 30, 3441–3453 (2023). https://doi.org/10.1007/s10570-023-05103-0

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  • DOI: https://doi.org/10.1007/s10570-023-05103-0

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