Effect of TEMPO-oxidization and rapid cooling on thermo-structural properties of nanocellulose
Effect of TEMPO-oxidization and rapid cooling on thermo-structural properties of nanocellulose
复制标题
DOI：
10.1016/j.carbpol.2017.05.084
复制
发表时间：
2017-10-01
影响因子：
11.2
通讯作者：
Nai-Shang, Liou
中科院分区：
文献类型：
--
作者：
Haniffa, Mhd Abd Cader Mhd;Ching, Yern Chee;Nai-Shang, Liou
近年来，绿色纳米材料的表面功能和热性能在众多应用中受到广泛关注。本研究以微晶纤维素（MCC）为原料，采用酸水解法制备纳米纤维素（NCCs）。采用TEMPO[（2,2,6,6-四甲基胡椒苷-1-基）氧自由基]氧化法制备了TEMPO氧化的NCCs。用tempo -氧化法制备纤维素纳米原纤维。通过红外光谱（FTIR）、热重分析（TGA-DTG）和x射线衍射（XRD）研究了快速冷却和化学处理对制备的纳米纤维素热结构性能的影响。对FTIR和TGA-DTG的事后分析表明，与其他纳米纤维素相比，快速冷却处理提高了tempo氧化NCC的氢键能和热稳定性。XRD分析显示了快速冷却对伪2(I)螺旋构象的影响。这是第一次研究快速冷却对纳米纤维素结构性能的影响。(C) 2017 Elsevier Ltd.版权所有。
Recently, surface functionality and thermal property of the green nanomaterials have received wide attention in numerous applications. In this study, microcrystalline cellulose (MCC) was used to prepare the nanocrystalline celluloses (NCCs) using acid hydrolysis method. The NCCs was treated with TEMPO [(2,2,6,6-tetramethylpiperidin-1-yl) oxy radical]-oxidation to prepare TEMPO-oxidized NCCs. Cellulose nanofibrils (CNFs) also prepared from MCC using TEMPO-oxidation. The effects of rapid cooling and chemical treatments on the thermo-structural property studies of the prepared nanocelluloses were investigated through FTIR, thermogravimetric analysis-derivative thermogravimetric (TGA-DTG), and XRD. A posteriori knowledge of the FTIR and TGA-DTG analysis revealed that the rapid cooling treatment enhanced the hydrogen bond energy and thermal stability of the TEMPO-oxidized NCC compared to other nanocelluloses. XRD analysis exhibits the effect of rapid cooling on pseudo 2(I) helical conformation. This was the first investigation performed on the effect of rapid cooling on structural properties of the nanocellulose. (C) 2017 Elsevier Ltd. All rights reserved.