4.5 Article

Effects of Alkali Treatment on the Mechanical Properties and Moisture Absorption Behavior of Flax/polypropylene Composites

期刊

JOURNAL OF NATURAL FIBERS
卷 19, 期 14, 页码 9201-9222

出版社

TAYLOR & FRANCIS INC
DOI: 10.1080/15440478.2021.1982813

关键词

Flax fiber; hemicellulose; alkali treatment; hygrothermal; tensile; bending

资金

  1. Fundamental Research Funds for the Central Universities [WUT: 2019III074GX]
  2. Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory

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Alkali treatment of flax fiber can enhance the performance of composite materials, with the optimum improvement in moisture absorption and mechanical properties achieved at a 5 wt. % NaOH concentration. Further increase in NaOH concentration leads to decreased hygrothermal durability and mechanical properties.
Flax fiber is one of the strongest natural fibers. However, it is highly susceptible to moisture absorption and has poor adhesion with polymer matrix. Alkali treatment of flax fiber was considered in this study aiming to overcome this issue. Four alkali solutions with different NaOH concentrations, i.e., 1 wt. %, 5 wt. %, 10 wt. %, and 15 wt. %, were prepared covering both low and high concentrations. It is successfully demonstrated that polypropylene composites reinforced by alkali-treated flax fibers not only absorbed less moisture but had better tensile and bending properties. At a NaOH concentration of 5 wt. %, maximum decrease in moisture absorption and optimum improvement in mechanical properties were simultaneously achieved. Further increase in NaOH concentration resulted in degradation of both hygrothermal durability and mechanical properties. The underlying mechanisms were comprehensively explored considering both compositional and microstructural changes due to alkali treatment.

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