N-Bromosuccinimide (NBS) – an efficient catalyst for acetylation of wood

Nagarajappa, Giridhar B.; Pandey, Krishna K.; Shinde, Aniket S.; Vagdevi, H. M.

doi:10.1515/hf-2015-0088

Cited by 10 publications

(6 citation statements)

References 28 publications

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“…The use of Nbromosuccinimide (NBS) as catalyst has been demonstrated as a convenient and effective method. Nagarajappa et al (2015) [14] reported the full mechanism of the acetylation reaction using NBS catalysts, and cites that, others catalyst has also been used in acetylation reactions, such as pyridine, but the toxic nature and unpleasant odor make pyridine unsuitable for large-scale applications [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Sorbent system based on acetylated microfibrillated cellulose for remediation of oil aquatic environments

2019

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The growth of oil exploration and transport in marine environments brings concern over potential environmental disasters caused by oil spills. Thus, various materials are being developed and studied in order to minimize environmental impacts caused by these oil spills. Among these materials, the use of sorbents has appeared as a great potential technique for the treatment of effluents, by separating and collecting oil in the aqueous medium. This work describes the development of a sorbent system based on acetylated microfibrillated cellulose. Initially, cellulose fibers were modified by an acetylation reaction and thereafter, by a mechanical process using a wheel mill grinding. To produce the sorbent system, fibers were coated by three different types of envelopes to prevent leakage during the sorption experiment. Main results indicate a higher oil sorption by sorbents with higher oil viscosity and higher grammage of the envelope. Acetylated microfibrillated cellulose showed low water adsorption and high selectivity to oil and greater oil sorption values than commercially sorbent currently used, based on polypropylene fibers.

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Section: Introductionmentioning

confidence: 99%

Sorbent system based on acetylated microfibrillated cellulose for remediation of oil aquatic environments

2019

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“…Specimens of W. tinctoria (size 150 mm x 3,5 mm x 5 mm) were acetylated with acetic anhydride using N-bromosuccinimide (NBS) as catalyst (concentration 2 % weight /volume) as per the procedure described by Nagarajappa et al 2015. Reaction was carried out in an oil bath (reaction conditions: temperature -105 °C, reaction time -4 h) in a glass vessel connected to a water condenser.…”

Section: Acetylation Of Woodmentioning

confidence: 99%

Photostability of acetylated wood coated with nano zinc oxide

Nagarajappa

Nair

Srinivas

et al. 2020

Maderas, Cienc. tecnol.

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Chemical modification with acetic anhydride is an effective method to stabilise wood against dimensional movement and improve decay resistance of wood. It has also been reported to retard UV light induced color darkening on wood surface. Coatings of wood surfaces with certain nano metal oxides have also shown promise as UV screening agent. In this work, we have evaluated synergistic effect of acetylation of wood and application of nano material on wood surfaces to enhance their UV stability. Photo-stability of acetylated Wrightia tinctoria wood coated with zinc oxide (ZnO) nanodispersion was evaluated by irradiating these wood specimens to UV radiation in an accelerated weathering tester. Acetylation of wood with acetic anhydride exhibited photo-bleaching and inhibited light-induced color darkening observed in unmodified wood. Coating of unmodified and modified wood surfaces with ZnO nanodispersion reduced photo-discolouration and degradation of wood polymers. The photo-bleaching observed in chemically modified wood upon light irradiation was further enhanced by application of nano coating on wood surfaces.

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“…Compared to the polymer impregnation, chemical modification has more positive effects in water resistance and dimensional stability, because it can fundamentally reduce the amounts of hydroxyl groups. For example, acetylation involves the replacement of hydroxyl groups with acetyl groups of acetic anhydride (shown in Figure a). , The acetylated wood showed excellent dimensional stability, water resistance, and decay resistance. − However, due to the environmental, economic, and technical concerns, only a few acetylation methods have led to commercialization …”

Section: Introductionmentioning

confidence: 99%

Environmentally Benign Wood Modifications: A Review

Dong

Wang

et al. 2020

ACS Sustainable Chem. Eng.

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Wood modification, an efficient approach to enhance the intrinsic properties of wood, has been extensively studied for decades. Due to growing environmental awareness, the sustainability of wood modification has received more attention. Generally, the sustainability in wood modification should consist of three aspects: an environmentally friendly processes, renewable modifying agents, and nontoxic and biodegradable resultant products. Recently, some biobased modifying agents obtained from renewable feedstocks were explored for substituting the petroleum-based ones. This review focuses on representative wood modification methods, including furfurylation, impregnation with natural products and biodegradable polymers, and chemical modification with sustainable reagents, since these methods have the potential to enhance wood properties. However, there are many challenges for using these agents, including effectiveness in penetration, evenness in distribution, and durability. The cost, process conditions, and equipment of these methods could also be challenges for scaling up. In addition, current studies mainly pay attention to the green reagent selection and property enhancement, rather than environment behavior evaluation of the resultant products. Effort should be made to evaluate the ecotoxicity and degradation behavior of the modified wood since it can help us determine whether the new formulations are sustainable. Much work needs to be done to overcome the obstacles above-mentioned and to develop efficient modification methods with a minimum environmental impact.

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N-Bromosuccinimide (NBS) – an efficient catalyst for acetylation of wood

Cited by 10 publications

References 28 publications

Sorbent system based on acetylated microfibrillated cellulose for remediation of oil aquatic environments

Sorbent system based on acetylated microfibrillated cellulose for remediation of oil aquatic environments

Photostability of acetylated wood coated with nano zinc oxide

Environmentally Benign Wood Modifications: A Review

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