One-Step Activation and Surface Fatty Acylation of Cellulose Fibers in a Solvent-Free Condition,ACS Sustainable Chemistry & Engineering

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One-Step Activation and Surface Fatty Acylation of Cellulose Fibers in a Solvent-Free Condition
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2019-09-06 , DOI: 10.1021/acssuschemeng.9b01974
Lang Huang _{1,

2,

3} , Qiong Wu ₁ , Qingwen Wang ₄ , Michael Wolcott ₂

Affiliation

Fatty acid cellulose esters with excellent water repellency and improved processability have gained a lot of attention in varied applications. In this study, a “green” synthetic route employing mechanochemical reaction methods was developed to prepare long-chain cellulose esters from cellulose fibers. Specifically, cellulose fibers were ball-milled to prepare activated cellulose particles; asymmetric mixed anhydrides from acetic anhydride and oleic acid were formed for improved esterification reactivity. Cellulose powder and mixed anhydride were mechanochemically reacted during ball-milling. The effects of the catalyst, ball-milling time, and reagent molar ratio were investigated. The results revealed that ball-milling was shown to be an effective approach to modifying the surface of cellulose powder with acetic–oleic mixed chains. The adding of a catalyst accelerated the reaction greatly. Increasing the ball-milling time and raising the mixed anhydride molar fractions promoted the esterification of cellulose and increased the degree of substitution. The modified cellulose esters exhibited higher thermal stability and better water repellency than the untreated cellulose powders.

中文翻译：

无溶剂条件下纤维素纤维的一步活化和表面脂肪酰化

具有优异的拒水性和改进的可加工性的脂肪酸纤维素酯在各种应用中引起了很多关注。在这项研究中，开发了一种采用机械化学反应方法的“绿色”合成路线，以从纤维素纤维制备长链纤维素酯。具体地，将纤维素纤维球磨以制备活化的纤维素颗粒。由乙酸酐和油酸形成不对称混合酸酐，以提高酯化反应活性。球磨过程中，纤维素粉末和混合酸酐发生了机械化学反应。研究了催化剂，球磨时间和试剂摩尔比的影响。结果表明，球磨工艺是用乙酸-油性混合链改性纤维素粉末表面的有效方法。添加催化剂极大地促进了反应。增加球磨时间并提高混合酸酐摩尔分数会促进纤维素的酯化并增加取代度。与未处理的纤维素粉末相比，改性纤维素酯表现出更高的热稳定性和更好的拒水性。

更新日期：2019-09-07

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