Title page for ETD etd-11102004-095808


Type of Document Master's Thesis
Author Voitier, Matthew Daniel
Author's Email Address mvoiti1@lsu.edu
URN etd-11102004-095808
Title Durability of Pine Strandboard Modified with Low Molecular Weight Phenol Formaldehyde
Degree Master of Science (M.S.)
Department Renewable Natural Resources
Advisory Committee
Advisor Name Title
Ramsay Smith Committee Chair
Cornelis de Hoop Committee Member
Qinglin Wu Committee Member
Keywords
  • coptotermes formosanus
  • mold
  • decay
  • durability
  • MOR
  • gloeophylum trabeum
  • thickness swell
  • MOE
  • poria placenta
  • modulus of elasticity
  • modulus of rupture
  • internal bond
  • IB
  • formosan subterranean termite
  • termite
  • dimensional stability
  • strandboard
  • OSB
Date of Defense 2004-09-30
Availability unrestricted
Abstract
A continuing challenge for wood and wood-based composite building materials has been durability--the power of resisting agents or influences which tend to cause changes, decay, or dissolution; lastingness. In the case of wood-based products, this often requires a resistance to biological degradation and moisture related dimensional instability (particularly in particle and flake or strand boards).

Borden Chemical Company has developed a new low molecular weight phenol formaldehyde additive, PD-112, to improve durability in composite wood products. This study investigated PD-112ís contribution to durability in oriented strand board (OSB) through laboratory testing of treated southern pine strandboard panels versus untreated control panels. Tests examined mechanical properties, as well as resistance to degradation by water infiltration, mold, decay fungi and termite attack.

PD-112 treatment significantly reduced moisture induced thickness swelling without adverse effects on strength properties. Modulus of rupture (MOR) and modulus of elasticity (MOE) increased somewhat, while internal bonding strength (IB) increased greatly with increasing PD-112 treatment. PD-112 imparted good termite resistance to pine strandboard. Treatments gave excellent resistance to decay by selected brown rot fungi, and moderate resistance to growth of selected mold fungi.

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