A study of the effect of acetylation and propionylation surface treatments on natural fibres
A study of the effect of acetylation and propionylation surface treatments on natural fibres
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DOI：
10.1016/j.compositesa.2005.01.004
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发表时间：
2005-01-01
影响因子：
8.7
通讯作者：
Panayiotou, C
中科院分区：
文献类型：
--
作者：
Tserki, V;Zafeiropoulos, NE;Panayiotou, C
近年来，木质纤维素材料作为增强剂或填料在聚合物复合材料中的掺入受到越来越多的关注。尽管天然纤维与玻璃纤维相比具有许多优点，但其表面的强极性特征是一个限制因素，因为与强非极性热塑性基质的相容性非常低。这种不相容的问题可以用纤维预处理来克服，这可以增强相容性，尽管对经济有负面影响。本研究采用乙酰化和丙酰化两种纤维前处理方法对亚麻、大麻和木纤维进行预处理。通过衰减全反射-傅里叶变换红外光谱（ATR-FTIR）和X射线光电子能谱（XPS）研究了纤维的乙酰基/丙酰基与羟基之间的酯化作用，并通过滴定法对其程度进行了评估。采用X射线衍射（XRD）和扫描电子显微镜（SEM）对未处理和酯化纤维的结晶度和表面形貌进行了表征。由于木质素/半纤维素含量高，木质纤维的酯化反应程度最高。这两种光谱方法表明，纤维表面化学改变后的处理，结果表明，酯键存在于纤维表面上。扫描电子显微镜结果显示，两种处理都去除了纤维的非结晶成分，可能是蜡质物质，并改变了表面形貌的特征。结果还表明，纤维的结晶度略有下降，作为酯化的结果。(c)2005爱思唯尔有限公司保留所有权利。
Recently, the incorporation of lignocellulosic materials as reinforcing agents or as fillers in polymer composites has received an increased attention. Although natural fibres have a number of advantages over glass fibres, the strong polar character of their surface is a limiting factor, as compatibility with strongly apolar thermoplastic matrices is very low. Such problems of incompatibility may be overcome with fibre pretreatments, which can enhance compatibility, albeit having a negative impact on the economics. In the present study, two fibre pre-treatment methods, acetylation and propionylation, were applied on flax, hemp and wood fibres. The effect of esterification between the acetyl/propionyl groups and the hydroxyl groups of the fibre was examined by attenuated total reflectance-Fourier transform infrared (ATR-FTIR) and X-ray photoelectron spectroscopy (XPS), while its extent was assessed by titration. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to characterize the crystallinity and the surface morphology of the untreated and esterified fibres. The highest extent of the esterification reaction was achieved for the wood fibres due to their high lignin/hemicelluloses content. The two spectroscopic methods revealed that the fibre surface chemistry was altered after the treatments, as the results indicated that ester bonds are present on the fibre surface. The SEM results revealed that both treatments resulted in a removal of non-crystalline constituents of the fibres, possibly waxy substances, and alter the characteristics of the surface topography. It was also shown that the fibre crystallinity decreased slightly as a result of esterification. (c) 2005 Elsevier Ltd. All rights reserved.