Effect of enzymatic hydrolysis lignin on the mechanical strength and hydrophobic properties of molded fiber materials
Abstract
In this study, poplar chemi-mechanical pulp was used as a raw material to investigate the effect of enzymatic hydrolysis lignin (EHL) content on the tensile strength and hydrophobicity of molded fiber materials (MFMs). The tensile strength and hydrophobic properties of the fabricated MFMs with different EHL contents were evaluated, and changes in their microstructure, chemical structure, and thermal stability were characterized via scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, and thermogravimetric (TG) analysis, respectively. Results show that under the experimental conditions used herein, the addition of EHL could increase the tensile strength and surface water contact angle of MFMs up to 20.3 MPa and 95.0°, respectively. The SEM observations indicate that the addition of EHL expanded the contact area between the EHL and fibers, thereby reducing the holes between fibers. The FTIR and TG analyses indicated that hot-pressing degraded EHL to form small molecular substances and improved the reaction with aldehydes produced via carbohydrate degradation, improving both the inter-fiber bonding strength and hydrophobicity of the MFM surface.
Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: This work was supported by the Fundamental Research Funds for Central Universities (no. 2572018AB24) and the National Key Research and Development Program of China (no. 2017YFD0601004).
Employment or leadership: None declared.
Honorarium: None declared.
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©2019 Walter de Gruyter GmbH, Berlin/Boston
Artikel in diesem Heft
- Frontmatter
- An effective technique for constructing wood composite with superior dimensional stability
- Numerical analysis of moisture-induced strains and stresses in glued-laminated timber
- Contribution of lignin to the stress transfer in compression wood viewed by tensile FTIR loading
- Effect of enzymatic hydrolysis lignin on the mechanical strength and hydrophobic properties of molded fiber materials
- Investigating tool engagement in groundwood pulping: finite element modelling and in-situ observations at the microscale
- Defoliation by insects reduces the wood quality and cellulosic pulp production
- Effect of pulp fibers on the surface softness component of hygiene paper
- Cellulose triacetate from different sources: modification assessment through thermal and chemical characterization
- Incorporation of nano lignin reverse micelles on the transparency, UV-blocking and rheological properties of high-density polyethylene films
- Cellulose nanocrystals/silver nanoparticles: in-situ preparation and application in PVA films
- Larch-derived hierarchical nitrogen-doped carbon with echinus-like architecture for supercapacitor applications
Artikel in diesem Heft
- Frontmatter
- An effective technique for constructing wood composite with superior dimensional stability
- Numerical analysis of moisture-induced strains and stresses in glued-laminated timber
- Contribution of lignin to the stress transfer in compression wood viewed by tensile FTIR loading
- Effect of enzymatic hydrolysis lignin on the mechanical strength and hydrophobic properties of molded fiber materials
- Investigating tool engagement in groundwood pulping: finite element modelling and in-situ observations at the microscale
- Defoliation by insects reduces the wood quality and cellulosic pulp production
- Effect of pulp fibers on the surface softness component of hygiene paper
- Cellulose triacetate from different sources: modification assessment through thermal and chemical characterization
- Incorporation of nano lignin reverse micelles on the transparency, UV-blocking and rheological properties of high-density polyethylene films
- Cellulose nanocrystals/silver nanoparticles: in-situ preparation and application in PVA films
- Larch-derived hierarchical nitrogen-doped carbon with echinus-like architecture for supercapacitor applications