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首页> 外文期刊>Biomacromolecules >Homogeneous Suspensions of Individualized Microfibrils from TEMPO-Catalyzed Oxidation of Native Cellulose
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Homogeneous Suspensions of Individualized Microfibrils from TEMPO-Catalyzed Oxidation of Native Cellulose

机译：TEMPO催化天然纤维素氧化的单个微纤维的均相悬浮。

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摘要

Never-dried native celluloses (bleached sulfite wood pulp,cotton,tunicin,and bacterial cellulose) were disintegrated into individual microfibrils after oxidation mediated by the 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) radical followed by a homogenizing mechanical treatment.When oxidized with 3.6 mmol of NaClO per gram of cellulose,almost the totality of sulfite wood pulp and cotton were readily disintegrated into long individual microfibrils by a treatment with a Waring Blendor,yielding transparent and highly viscous suspensions.When observed by transmission electron microscopy,the wood pulp and cotton microfibrils exhibited a regular width of 3-5 nm.Tunicin and bacterial cellulose could be disintegrated by sonication.A bulk degree of oxidation of about 0.2 per one anhydroglucose unit of cellulose was necessary for a smooth disintegration of sulfite wood pulp,whereas only small amounts of independent microfibrils were obtained at lower oxidation levels.This limiting degree of oxidation decreased in the following order: sulfite wood pulp > cotton > bacterial cellulose,tunicin.
机译：由2,2,6,6-四甲基哌啶-1-氧基（TEMPO）自由基氧化后，从未干燥的天然纤维素（漂白的亚硫酸盐木浆，棉，衣胶和细菌纤维素）分解成单个微纤维，然后均质化机械处理。当每克纤维素用3.6 mmol NaClO氧化时，通过Waring Blendor处理，几乎所有亚硫酸盐木浆和棉花都容易分解成长条状微纤维，产生透明且高粘度的悬浮液。通过透射观察电子显微镜观察，木浆和棉的微纤维呈3-5 nm的规则宽度。丁尼克酸和细菌纤维素可通过超声分解。纤维素的一个脱水葡萄糖单元的整体氧化度约为0.2，才能使纤维素顺利崩解。亚硫酸盐木浆，而在较低的氧化水平下仅获得少量独立的微纤维。降低的顺序如下：亚硫酸盐木浆>棉花>细菌纤维素，衣胶。

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