Abstract
Abstract A solvent-free process has been developed concerning the chemical modification of rubberwood and the isolates from it (holocellulose and Klason lignin) by means of acetic anhydride (Ac2O) and butyric anhydride (But2O), with iodine as the catalyst. The effect of temperature and reaction time was in focus, and the conversion products were characterized by Fourier transform infrared (FTIR) spectroscopy. The acetylation of holocellulose and lignin with Ac2O was performed at 120°C, whereas the modification of wood with Ac2O and But2O was carried out in the temperature range of 90–120°C for different reaction times between 15 and 240 min. The extent of the chemical modification was measured by the weight percent gain, and the modified wood was characterized by FTIR-attenuated total reflectance (ATR) method. The presence of small amounts of iodine (0.02 or 0.035 M) elevated the conversion rate of modification. The dimensional stability of the modified woods was essentially improved.
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