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| Research on the DES Pretreatment of Eucalyptus Fibers and Its Cross-linking Plasticized Modification with Polyurethane |
| Received:July 09, 2025 Revised:July 26, 2025 |
| DOI：10.11981/j.issn.1000-6842.2025.03.161 |
| Key Words:eucalyptus fiber;polyurethane prepolymer;plasticity;plasticized modified films |
| Fund Project:国家自然科学基金（22078114）；国家重点研发计划政府间国际合作项目（2021YFE0104500）。 |
| Author Name | Affiliation | Postcode | | FU Shiyu* | College of Light Industrial Science and Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 | 510640 | | YUAN Xi | College of Light Industrial Science and Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 | 510640 | | LUO Min | China Pulp and Paper Research Institute Co.， Ltd.， Beijing， 100102 | 100102 |
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| Abstract: |
| Composite materials prepared by plasticized modifying plant fibers are environmentally friendly and sustainable， which can reduce the reliance on synthetic plastics. Used eucalyptus fibers as raw materials in this study， the deep eutectic solvent （DES） was used for pretreatment to improve the accessibility of eucalyptus fibers while retaining the cellulose framework structure and rigidity. Then， a hydrophobic modified polyurethane prepolymer （BDO-PU） was grafted from 1，4-butanediol （BDO）， hmethylene diisocyanate （HDI）， and polyethylene glycol （PEG）， and the fiber-based plasticized modified films with plastic processability were prepared. The results showed that when the mass ratio of eucalyptus fibers pre-treated with DES to BDU-PU was 3∶1， the tensile strength and the Young’s modulus of the BDO-PU plasticized modified film could reach 27 and 792 MPa， respectively. The wet tensile strength and wet Young’s modulus after 2 h immersion treatment still remained at 22 and 483 MPa， respectively. Under this condition， the surface hydrophobicity of BDO-PU plasticized modified film was enhanced， with a water contact angle of 118° and an equilibrium water absorption rate of 63%. The material exhibited good thermal stability and excellent thermoplastic processing performance. |
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