Production and characterization of cellulose nanocrystals of different allomorphs from oil palm empty fruit bunches for enhancing composite interlaminar fracture toughness
Production and characterization of cellulose nanocrystals of different allomorphs from oil palm empty fruit bunches for enhancing composite interlaminar fracture toughness
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DOI：
10.1016/j.carpta.2022.100272
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发表时间：
2023-06
影响因子：
5.5
通讯作者：
M. Ichwan;A. Onyianta;R. Trask;A. Etale;S. Eichhorn
中科院分区：
文献类型：
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作者：
M. Ichwan;A. Onyianta;R. Trask;A. Etale;S. Eichhorn
报道了从油棕榈空果串中提取α-纤维素过程中不同的碱处理对随后提取的纤维素纳米晶性能的影响。氢氧化钾处理保持了天然纤维素I的天然异形体。与商业纤维素纳米晶(CNCS)相比，油棕榈空果串(OPEFB)CNCS I类材料具有更高的长径比、更高的结晶度指数，但与商业CNCS相比，其电荷和热稳定性较低。与这两种类型的数控系统相比，OPEFB CNCS类型II具有更高的纵横比，但充电更低。第一类碳纳米管具有中等电荷，但具有较高的热稳定性，这可能使其更适合与热塑性聚合物一起加工。提供了一张完整的物理性质图，将油棕榈基CNCS与商业和实验室材料进行比较，以更好地了解它们可能如何在复合应用中被利用。结果表明，含有这些碳纳米碳管的电纺醋酸丁酸纤维素纳米纤维网络可以提高碳纤维-环氧层压板的II型层间断裂韧性。
The effect of different alkaline treatments during the extraction of α-cellulose from oil palm empty fruit bunches on the properties of subsequently extracted cellulose nanocrystals are reported. Sodium hydroxide in an alkaline process step results in a change of native cellulose from type I to II. Treatment with potassium hydroxide maintains the native allomorph of cellulose I. Compared to commercial cellulose nanocrystals (CNCs), oil palm empty fruit bunch (OPEFB) CNCs type I materials have higher aspect ratios, higher crystallinity index, but lower charge, and thermal stability compared to commercial CNCs. OPEFB CNCs type II have a higher aspect ratio, but lower charge than both types of CNC. Type I CNCs exhibit intermediate charge, but higher thermal stability which might make them more suitable for processing with thermoplastic polymers. A full map of physical properties, comparing the oil palm based CNCs to both commercial and lab-based materials is presented to better understand how they might be exploited in composite applications. It is demonstrated that aligned electrospun cellulose acetate butyrate nanofibrous networks containing these CNCs can enhance the mode-II interlaminar fracture toughness of a carbon fibre-epoxy laminate.