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Title: Effect of weight percent gain and experimental method on fiber saturation point of acetylated wood determined by differential scanning calorimetry

Source: Wood Science and Technology. 51(6): 1291-1305

Author(s)Passarini, Leandro ; Zelinka, Samuel L.; Glass, Samuel V; Hunt, Christopher G.

Publication Year: 2017  View PDF »

Category: Journal Articles
Associated Research Project(s):   FPL-4707-2B   FPL-4716-3A

Abstract: This paper evaluates the effects of acetylation level and experimental method on the observed fber saturation point (FSP) of loblolly pine (Pinus taeda)woodmeasuredusing differential scanning calorimetry. To achieve this goal, 1-mm-thick latewood samples were tested overawiderange of equilibrium moisture content(EMC). In this work, the FSP was defined as the non-freezable portion of water of the samples.Two experimental methods were used: the extrapolation of the melting enthalpy to zero and the direct calculation of the non-freezable water amount. For both methods, the FSP decreased with increasing acetylation, varying from about 27% reduced EMC (EMCR) for control to about 9% EMCR for the highest level of acetylation. For unmodifed samples, the measured FSP was higher with faster scan rates. Moreover, under a specifc range of EMCR, freezing curves revealed the occurrence of two water phase transitions for samples at the highest level of acetylation. Based onprevious studies andinpresent fndings, there is strong evidence that the lower temperature freezing peak may result from the homogenous nucleation of water, which is physically separated from water that freezes heterogeneously.

Keywords: Modified wood; fiber saturation point; differential scanning calorimetry

Publication Review Process: Formally Refereed

File size: 446 kb(s)

Date posted: 07/17/2018

This publication is also viewable on Treesearch:  view
RITS Product ID: 90600
Current FPL Scientists associated with this product (listed alphabetically)
Glass, Samuel V.
Research Physical Scientist
Hunt, Christopher G.
Research Chemist
Zelinka, Samuel L.
Materials Research Engineer

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