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Surface hydrophobization of bacterial and vegetable cellulose fibers using ionic liquids as solvent media and catalysts

机译：使用离子液体作为溶剂介质和催化剂的细菌和植物纤维素纤维的表面疏水化

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摘要

The surface hydrophobization through heterogeneous chemical modification of bacterial (and vegetable) cellulose fibers with several anhydrides (acetic, butyric, hexanoic and alkenyl succinic anhydrides) and hexanoyl chloride suspended in an ionic liquid, tetradecyltrihexylphosphonium bis(trifluoromethylsulfonyl)imide, [TDTHP][NTf2], was studied. Furthermore, in the reaction with hexanoyl chloride, another ionic liquid, N-hexyl-4-(dimethylamino)pyridinium bis(trifluoro-methylsulfonyl)imide, [C6N(CH3)2py][NTf2], was used instead of common organic bases as catalyst and to trap the released HC1. The analysis of the ensuing modified fibers by FTIR, XRD and SEM clearly showed that the esterification reactions occurred essentially at the fibers' outmost layers, not affecting their ultrastructure. The degree of substitution (DS) of the ensuing esterified fibers ranged from less than 0.002 to 0.41; and in all instances, the fibers' surface acquired a high hydrophobicity. This novel approach constitutes an important strategy in the preparation of modified fibers under greener conditions relaying in the use of non-volatile solvents.
机译：通过用几种酸酐（乙酸，丁酸，己酸和链烯基琥珀酸酐）和己酰氯悬浮在离子液体，十四烷基三己基双（三氟甲基磺酰基）酰亚胺[TDTHP] [NTf2]中对细菌（和植物）纤维素纤维进行异质化学修饰，对表面进行疏水化处理]，进行了研究。此外，在与己酰氯的反应中，使用另一种离子液体N-己基-4-（二甲氨基）吡啶双（三氟-甲基磺酰基）酰亚胺[C6N（CH3）2py] [NTf2]代替常见的有机碱。催化剂并捕获释放的HCl。通过FTIR，XRD和SEM对随后的改性纤维的分析清楚地表明，酯化反应基本上发生在纤维的最外层，而不影响其超微结构。随后的酯化纤维的取代度（DS）范围小于0.002至0.41;在所有情况下，纤维表面都具有很高的疏水性。这种新方法构成了在绿色条件下制备非变性溶剂中转用改性纤维的重要策略。

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