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Thermochemical pretreatment of underutilized woody biomass for manufacturing wood composites

Author: Manuel Raul Pelaez Samaniego; Washington State University. Department of Biological systems Engineering.
Publisher: [Pullman, Washington] : Washington State University, 2014.
Dissertation: Ph. D. Washington State University 2014
Edition/Format:   Thesis/dissertation : Thesis/dissertation : eBook   Computer File : English
Database:WorldCat
Summary:
Prescribed fires, one method for reducing hazardous fuel loads from forest lands in the US, are limited by geographical, environmental, and social impacts. Mechanical operations are an alternative type of fuel treatment but these processes are constrained by the difficulty of economically harvesting and/or using large amounts of low-value woody biomass. Adoption and integration of new technologies into existing wood
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Details

Genre/Form: Academic theses
Material Type: Thesis/dissertation, Internet resource
Document Type: Internet Resource, Computer File
All Authors / Contributors: Manuel Raul Pelaez Samaniego; Washington State University. Department of Biological systems Engineering.
OCLC Number: 909283182
Notes: "Doctor of Philosophy, Washington State University, Department of Biological systems Engineering, August 2014."
Title from PDF title page (viewed on May 18, 2015).
Description: 1 online resource
Responsibility: by Manuel Raul Pelaez Samaniego.

Abstract:

Prescribed fires, one method for reducing hazardous fuel loads from forest lands in the US, are limited by geographical, environmental, and social impacts. Mechanical operations are an alternative type of fuel treatment but these processes are constrained by the difficulty of economically harvesting and/or using large amounts of low-value woody biomass. Adoption and integration of new technologies into existing wood composite facilities offer better utilization of this material. A pretreatment that enables integration of technologies in a typical composite facility will aid with diversification of product portfolio (e.g. wood composites, fuel pellets, liquid fuels, chemicals). Hot water extraction (HWE) is an option for wood pretreatment.

This work provides a fundamental understanding of the physicochemical changes to wood resulting from HWE, and how these changes impact processing and performance of composites. Specific objectives were to: 1) review literature on studies related to the manufacture of composites produced with thermally pretreated wood, 2) manufacture wood plastic composites (WPC) and particleboard using HWE wood and evaluate the impacts of pretreatment on product properties, 3) develop an understanding of the effect of HWE on lignin properties, specifically lignin at the cells surface level after migration from cell walls and middle lamella, 4) discern the influence of lignin on the fiber surface on processing WPCs, and, 5) investigate the effect of changing the pretreatment environment (inert gas instead of water) on lignin behavior. Results show that HWE enhances the resistance of both WPCs and particleboard to water with positive or no effect on mechanical properties. Reduction of hemicelluloses and lignin property changes are suggested as the main reasons for enhancing interaction between wood fiber and resins during composite processing. Lignin on the surface of particles after HWE interacts with thermoplastics during WPCs compounding, thus improving bond quality between the constituents and maintaining the mechanical properties of the composites. The amount and properties of lignin on the fiber surfaces depends on the pretreatment conditions. Thus, it seems possible to control the pretreatment process to increase or decrease the amount of lignin on particles surfaces, which is of great interest for managing downstream processes within biorefinery concepts.

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