Optimizing the yield and physico-chemical properties of pine cone cellulose nanocrystals by different hydrolysis time

被引：0
作者：
Daniel García-García
Rafael Balart
Juan Lopez-Martinez
Monica Ek
Rosana Moriana
机构：
[1] Universitat Politècnica de València (UPV),Instituto de Tecnología de Materiales (ITM)
[2] KTH-Royal Institute of Technology,School of Engineering Sciences in Chemistry, Biotechnology and Health, Department of Fibre and Polymer Technology
[3] HIS-University of Skövde,School of Engineering Science
[4] Skövde,undefined
来源：
Cellulose | 2018年 / 25卷
关键词：
Pine cones; Cellulose nanocrystals; Sulfuric hydrolysis conditions; Physico-chemical properties; Yield-recovery;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Cellulose nanocrystals (CNCs) were isolated for the first time from pine cones (PC) by alkali and bleaching treatments and subsequent sulfuric acid hydrolysis (64%) at 45 °C. The influence of the hydrolytic reaction time (30, 45, and 90 min) on the yield, chemical composition and structure, and thermal stability of CNCs was evaluated. The removal of non-cellulosic constituents during the alkaline and bleaching treatment resulted in high pure cellulosic fibres. The isolation of CNCs from these cellulosic fibres at different reaction times was verified by the nano-dimensions of the individual crystals (< 3 and < 335 nm of average diameter and length, respectively). The highest yield (15%) and the optimum CNCs properties in terms of aspect ratio, thermal stability and crystallinity were obtained for an extraction time of 45 min. PC appeared to be a new promising source of cellulose fibres and CNCs with potential to be applied as reinforcement in composites and for food-packaging.
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页码：2925 / 2938
页数：13
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