Interrelationship between lignin-rich dichloromethane extracts of hot water-treated wood fibers and high-density polyethylene (HDPE) in wood plastic composite (WPC) production
-
Manuel R. Pelaez-Samaniego
,
Manuel Garcia-Perez
Abstract
Hot water extraction (HWE) partially removes hemicelluloses from wood while leaving the majority of the lignin and cellulose; however, the lignin partially migrates to the inner surfaces of the cell wall where it can be deposited as a layer that is sometimes visible as droplets. This lignin-rich material was isolated via Soxhlet extraction with dichloromethane to investigate its rheological behavior in blends with high-density polyethylene (HDPE), a common material in wood plastic composites (WPCs). Pyrolysis gas-chromatography/mass spectrometry (Py-GC/MS) and electrospray ion mass spectrometry (ESI/MS) confirmed that the isolated material is constituted mainly of low-molecular-weight lignin oligomers. The blends of HDPE/isolated lignin, in varying ratios, were tested by means of dynamic rheology. A “shoulder” was found in plots “shear storage moduli (G′) vs. frequency sweep” and a shift of the terminal zone to lower frequencies was observed. Apparently, this shoulder is caused by the elastic contribution of the interfacial tension between the blend components. The rheology of WPCs produced from HWE wood and HDPE shows a similar shoulder in G′ plots, suggesting that the HDPE/lignin blends are in part responsible for the shape of the G′ curves.
Acknowledgments
The authors acknowledge the support of the USDA Forest Service Research and Development Woody Biomass, Bioenergy, and Bioproducts 2009 Grant Program (Agreement No. 09-JV-11261975-028). M.R. Pelaez-Samaniego acknowledges the Fulbright Faculty Development Program Scholarship.
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©2016 by De Gruyter
Articles in the same Issue
- Frontmatter
- Original Articles
- Profiles of alkali concentration and galactoglucomannan degradation in kraft impregnation of Scots pine wood: Experimental observations and modeling
- Solvent screening for the fractionation of industrial kraft lignin
- Pilot-scale demonstration of SPORL for bioconversion of lodgepole pine to bioethanol and lignosulfonate
- Interrelationship between lignin-rich dichloromethane extracts of hot water-treated wood fibers and high-density polyethylene (HDPE) in wood plastic composite (WPC) production
- A new cis-p-coumaroyl flavonol glycoside from the inner barks of Sophora japonica L.
- Modification of poplar wood with glucose crosslinked with citric acid and 1,3-dimethylol-4,5-dihydroxy ethyleneurea
- Influence of atmospheric pressure plasma treatments on the surface properties of ligno-cellulosic substrates
- Superhydrophobic conductive wood with oil repellency obtained by coating with silver nanoparticles modified by fluoroalkyl silane
- Wettability and swelling of acetylated and furfurylated wood analyzed by multicycle Wilhelmy plate method
- Pre-grading of spruce logs containing frozen and unfrozen water by means of frequency-based nondestructive testing (NDT)
- Cork structural discontinuities studied with X-ray microtomography
Articles in the same Issue
- Frontmatter
- Original Articles
- Profiles of alkali concentration and galactoglucomannan degradation in kraft impregnation of Scots pine wood: Experimental observations and modeling
- Solvent screening for the fractionation of industrial kraft lignin
- Pilot-scale demonstration of SPORL for bioconversion of lodgepole pine to bioethanol and lignosulfonate
- Interrelationship between lignin-rich dichloromethane extracts of hot water-treated wood fibers and high-density polyethylene (HDPE) in wood plastic composite (WPC) production
- A new cis-p-coumaroyl flavonol glycoside from the inner barks of Sophora japonica L.
- Modification of poplar wood with glucose crosslinked with citric acid and 1,3-dimethylol-4,5-dihydroxy ethyleneurea
- Influence of atmospheric pressure plasma treatments on the surface properties of ligno-cellulosic substrates
- Superhydrophobic conductive wood with oil repellency obtained by coating with silver nanoparticles modified by fluoroalkyl silane
- Wettability and swelling of acetylated and furfurylated wood analyzed by multicycle Wilhelmy plate method
- Pre-grading of spruce logs containing frozen and unfrozen water by means of frequency-based nondestructive testing (NDT)
- Cork structural discontinuities studied with X-ray microtomography
