Department of Polymer Science and Technology, University of Calcutta,92 A.P.C. Road, Kolkata - 700 009, West Bengal, India; Department of Jute and Fiber Technology, Institute of Jute Technology, University of Calcutta, 35 Ballygunge Circular Road, Kolkata - 700 019, West Bengal, India.
Department of Polymer Science and Technology, University of Calcutta,92 A.P.C. Road, Kolkata - 700 009, West Bengal, India.
Int J Biol Macromol. 2018 Apr 1;109:1246-1252. doi: 10.1016/j.ijbiomac.2017.11.123. Epub 2017 Nov 21.
There is a need for reuse of waste cotton lint (WCL) from the blow room of yarn spinning mills. The drive to use this material for the synthesis of nanocellulose is difficult because of the several purification/pretreatment processes. Here, we developed a combined single bath purification process of WCL and utilized it for the synthesis of nano-crystalline cellulose crystals (NCs) which are valuable nanomaterials with novel properties along with acid recovery for reuse. The micrograph of the synthesized NCs confirmed a network of nano-sized crystalline cellulose crystals having nano ranged diameter of NCs isolated by two processes. The FTIR result established the removal of impurities and hemicelluloses from WCL. The crystallinity index of WCL (∼89.97%) is improved to ∼96% and ∼94% for sulphuric acid and nitric acid synthesized NCs (NC1 and NC2). The crystallite size of WCL, CTWCL, NC1, and NC2 was calculated using XRD and found to be 101.56, 103.54, 98.81, and 95.6nm respectively. The hydrodynamic size (Z-average) (dnm), polydispersity index and zeta potential of NCs was also studied using dynamic light scattering (DLS). The thermal stability of the NC1 is better than that of NC2. These NCs can be used as reinforcing filler/barrier material.
需要对纺纱厂梳理机中的废棉绒（WCL）进行再利用。由于需要经过多次净化/预处理过程，因此将这种材料用于纳米纤维素的合成存在困难。在这里，我们开发了一种 WCL 的组合单浴净化工艺，并将其用于合成纳米纤维素晶体（NCs），这是具有新颖特性的有价值的纳米材料，并回收酸以重复使用。合成 NCs 的微观照片证实了纳米纤维素晶体的网络，该网络具有纳米级直径的 NCs，这些 NCs通过两种工艺分离。FTIR 结果表明，WCL 中的杂质和半纤维素已被去除。WCL（约 89.97%）的结晶度指数提高到硫酸和硝酸合成的 NC1 和 NC2 的约 96%和 94%。使用 XRD 计算了 WCL、CTWCL、NC1 和 NC2 的微晶尺寸，分别为 101.56、103.54、98.81 和 95.6nm。还使用动态光散射（DLS）研究了 NCs 的流体动力学尺寸（Z 平均）（dnm）、多分散指数和zeta 电位。NC1 的热稳定性优于 NC2。这些 NCs 可用作增强填料/阻隔材料。
