Green modification of natural fibres with nanocellulose
Green modification of natural fibres with nanocellulose
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DOI：
10.1039/c3ra22196b
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发表时间：
2013-01-01
期刊：
影响因子：
3.9
通讯作者：
Fan, Mizi
中科院分区：
文献类型：
--
作者：
Dai, Dasong;Fan, Mizi
本文提出了一种两步纳米纤维素改性大麻纤维的绿色工艺，并研究了改性效果的机制。结果表明，本发明的纳米改性显着提高了大麻纤维的机械和界面性能。纳米改性的优化条件（pH 11、0.1%DTAB）使大麻纤维的模量、拉伸应力和拉伸应变分别增加了36.13%、72.80%和67.69%。 FEG-SEM显微照片显示，纳米纤维素以两种方式对天然纤维进行改性，即纳米纤维素(i)填充纹状体和(ii)在原纤维之间的间隙中粘合原纤维间。 XRD结果表明，纳米改性使天然纤维的结晶度指数提高了38.46%。纳米改性纤维的树脂吸收率提高了39.00%。 XPS测量和ATR-FTIR表征表明，纳米纤维素改性可能导致化学元素和界面化学结构的变化，以及纳米纤维素C-2和C-6位羟基与不饱和聚酯羧基之间的酯化作用。
The present paper presents a green process of two-step nanocellulose modification of hemp fibres and investigates the mechanisms of the efficacy of the modification. The results showed that the present nano-modification significantly increased the mechanical and interfacial properties of hemp fibres. The optimized condition (pH 11, 0.1% DTAB) of the nano-modification resulted in an increase of the modulus, tensile stress and tensile strain of hemp fibres by 36.13%, 72.80% and 67.69% respectively. FEG-SEM micrograph revealed that the nanocellulose modified the natural fibres in two ways, namely, nanocellulose (i) filling in the stria and (ii) bonding the inter-fibrils in the gaps between fibrils. XRD results showed the nano-modification increased the crystallinity index of natural fibres up to 38.46%. Resin absorption of the nano-modified fibres increased by 39.00%. XPS measurement and the ATR-FTIR characterization indicated that the nanocellulose modification may have resulted in changes in the chemical elements and chemical structure of interfaces, the esterification between hydroxyl groups at C-2 and C-6 of nanocellulose and carboxyl groups of the unsaturated polyester.