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The influence of wood extractives on...

Nzokou, Pascal.

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The influence of wood extractives on durability properties of hardwoods and softwood exposed to artificial weathering.

Record Type:	Electronic resources : Monograph/item
Title/Author:	The influence of wood extractives on durability properties of hardwoods and softwood exposed to artificial weathering./
Author:	Nzokou, Pascal.
Description:	162 p.
Notes:	Source: Dissertation Abstracts International, Volume: 65-04, Section: B, page: 1612.
Contained By:	Dissertation Abstracts International65-04B.
Subject:	Agriculture, Forestry and Wildlife. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3129527

The influence of wood extractives on durability properties of hardwoods and softwood exposed to artificial weathering.
Nzokou, Pascal.

The influence of wood extractives on durability properties of hardwoods and softwood exposed to artificial weathering. - 162 p.

Source: Dissertation Abstracts International, Volume: 65-04, Section: B, page: 1612.

Thesis (Ph.D.)--Michigan State University, 2004.

Wood is the prime building material for various structures in outdoors applications. It is widely used for structures such as decking, railroad crossties, and playground equipment. However, when exposed to outdoor conditions, wood is susceptibleSubjects--Topical Terms:

783690
Agriculture, Forestry and Wildlife.

The influence of wood extractives on durability properties of hardwoods and softwood exposed to artificial weathering.
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100 1 $a Nzokou, Pascal. $3 1950307
245 1 4 $a The influence of wood extractives on durability properties of hardwoods and softwood exposed to artificial weathering.
300 $a 162 p.
500 $a Source: Dissertation Abstracts International, Volume: 65-04, Section: B, page: 1612.
500 $a Adviser: D. Pascal Kamdem.
502 $a Thesis (Ph.D.)--Michigan State University, 2004.
520 $a Wood is the prime building material for various structures in outdoors applications. It is widely used for structures such as decking, railroad crossties, and playground equipment. However, when exposed to outdoor conditions, wood is susceptible
520 $a This project investigated the influence of wood extractives on the weathering of red oak (Quercus rubra), black cherry (Prunus serotina), and red pine (Pinus resinosa).
520 $a The first hypothesis of the study was that wood extractives occupy moisture sorption sites in wood and prevent water absorption. Therefore, removal of extractives by the weathering process leads to higher moisture absorption, which in turn leads
520 $a To test these hypotheses organic solvents were used to remove extractives from red pine, red oak, and black cherry wood specimens. Their physical, chemical and aesthetic degradation processes were monitored during laboratory conducted artificial
520 $a Fourier Transformed Infrared and X-Rays Photoelectron spectroscopy analysis demonstrated the removal of high carbon contents (from extractives and lignin), and increased exposure of cellulose and hemicellulose on the extracted wood surfaces.
520 $a Water sorption of extracted wood surfaces was higher than that of un-extracted surfaces at high relative humidities as a result of availability of moisture sorption sites previously occupied by extractives, which became available follow extracti
520 $a Analysis of the surface roughness, weight loss and microscopic degradation, however, showed no statistically significant difference between control and extracted samples for red oak and black cherry, and a significant difference in the direction
520 $a The photo-discoloration study of wood surfaces evidenced a significant influence of water extractives on the overall discoloration of wood surface when exposed to artificial weathering. The presence of extractives slowed the discoloration proces
520 $a These results suggest that extractives affect the chemical processes occurring on the wood surface, but their influence on the physical degradation of wood, which is more affected by the wood structure, is limited.
590 $a School code: 0128.
650 4 $a Agriculture, Forestry and Wildlife. $3 783690
650 4 $a Agriculture, Wood Technology. $3 1031154
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710 2 0 $a Michigan State University. $3 676168
773 0 $t Dissertation Abstracts International $g 65-04B.
790 1 0 $a Kamdem, D. Pascal, $e advisor
790 $a 0128
791 $a Ph.D.
792 $a 2004
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3129527