Moisture in Untreated, Acetylated, and Furfurylated Norway Spruce Studied During Drying Using Time Domain NMR<sup>1</sup>
Keywords:Time domain NMR, spin-spin relaxation, wood, moisture, water, acetylation, furfurylation
AbstractUsing time domain NMR, the moisture in Norway spruce (Picea abies (L.) Karst.) sapwood subjected to four different treatments (never-dried, dried and remoistened, acetylated, and furfurylated) was studied during drying at 40°C, at sample average moisture contents above fiber saturation. Spin-spin relaxation time distributions were derived from CPMG relaxation curves using multiexponential fitting (CONTIN), and the resulting water populations were assigned according to the literature and their behavior during drying. It was found that both acetylation and furfurylation increased the average spin-spin relaxation time of the lumen water in earlywood tracheids from about 80-100 ms to 200 and 300 ms, respectively. The average spin-spin relaxation time of the cell wall water was reduced from about 1.4 to 0.65 ms by furfurylation, while acetylation had less effect on this water. The relaxation times of both the earlywood lumen water and of the cell wall water were slightly longer for the never-dried samples than for the dried and remoistened samples.
Araujo CD, MacKay AL, Hailey JRT, Whittall KP, Le H (1992) Proton magnetic resonance techniques for characterization of water in wood: Application to white spruce. Wood Sci Technol 26:101-113.nAraujo CD, Whittall KP, Hailey JRT (1993) A diffusion model for spin-spin relaxation of compartmentalized water in wood. J Magn Reson B 101:248-261.nAraujo CD, Avramidis S, MacKay AL (1994) Behaviour of solid wood and bound water as a function of moisture content. A proton magnetic resonance study. Holzforschung 48:69-74.nBerthold J, Rinaudo M, Salmén L (1996) Association of water to polar groups; estimations by an adsorption model for ligno-cellulosic materials. Colloid Surface A 112(2-3):117-129.nDefo M, Fortin Y, Cloutier A (1999) Moisture contentwater potential relationship of sugar maple and white spruce wood from green to dry conditions. Wood Fiber Sci 31(1):62-70.nElder T, Labbé N, Harper D, Rials T (2006) Time domainnuclear magnetic resonance study of chars from southern hardwoods. Biomass Bioenerg 30:855-862.nFlibotte S, Menon RS, MacKay AL, Hailey JRT (1990) Proton magnetic resonance of western red cedar. Wood Fiber Sci 22(4):362-376.nLabbé N, Jéso BD, Lartigue J-C, Daudé G, Pétraud M, Ratier M (2002) Moisture content and extractive materials in maritime pine wood by low field 1H NMR. Holzforschung 56:25-31.nLabbé N, Jéso BD, Lartigue J-C, Daudé G, Pétraud M, Ratier M (2006) Time-domain 1H NMR characterisation of the liquid phase in greenwood. Holzforschung 60:265-270.nHartley ID, Kamke FA, Peemoeller H (1992) Cluster theory for water in wood. Wood Sci Technol 26(2):83-99.nHill CAS, Forster SC, Farahani MRM, Hale MDC, Ormondroyd GA, Williams GR (2005) An investigation of cell wall micropore blocking as a possible mechanism for the decay resistance of anhydride modified wood. Int Biodeterior Biodegradation 55:69-76.nMatsuda H (1996) Chemical modification of solid wood. Chapter 6, pp 166-167 in David N.-S. Hon, ed. Chemical modification of lignocellulosic materials. Marcel Dekker, New York.nMenon RS, MacKay AL, Hailey JRT, Bloom M, Burgess AE, Swanson JS (1987) A NMR determination of the physiological water distribution in wood during drying. J Appl Polym Sci 33:1141-1155.nPapadopoulos AN, Hill CAS (2003) The sorption of water vapour by anhydride modified softwood. Wood Sci Technol 37:221-231.nProvencher SW (1982) Contin: A general purpose constrained regularization program for inverting noisy linear algebraic and integral equations. Comput Phys Commun 27:229-242.nRowell RM, Tillman A-M, Simonson R (1986) A simplified procedure for the acetylation of hardwood and softwood flakes for flakeboard production. J Wood Chem Technol 6(3):427-448.nSalmén L (1997) The sorption behaviour of wood. Pages 33-44 in P Hoffmeyer, ed Proc of the International Conference on Wood-Water Relations (COST action E8), June 16-17, 1997, Copenhagen, Denmark.nSharp AR, Riggin MT, KAISER R, SCHNEIDER MH (1978) Determination of moisture content of wood by pulsed nuclear magnetic resonance. Wood Fiber Sci 10(2):74-81.nWhittall KP, MacKay AL (1989) Quantitative interpretation of NMR relaxation data. J Magn Reson 84:134-152.n
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