The Effect of Fiber Treatment on the Water Absorption of Piliostigma Reinforced Epoxy

ChemSearch Journal Pub Date : 2015-01-01 DOI:10.4314/CSJ.V6I2.1

S. Gumel, A. Tijjani

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引用次数: 3

Abstract

In this paper, the water absorption behaviour of 14 days hardened composites based on Piliostigma fiber and a thermosetting matrix (Epoxy) was studied. The water absorption tests were carried out in order to study the durability of the composites. The comparative study of water absorption behaviour of composites reinforced with fiber and chemically modified in three reagents (NaOH, KMnO 4 , BPO) respectively confirmed that surface treatment of the fibres influences the sorption process. The most significant decrease in hydrophilicity of Piliostigma was found in the case of Piliostigma fiber that was modified by BPO, This decrease relates to change in the chemical composition of the Piliostigma fiber, especially due to a decrease in the average degree of cellulose polymerization as well as the hemicellulose content. The chemical composition effect on the surface modification was analysed by means of Fourier Transform Infrared Spectroscopy (FTIR), The experimental spectroscopic information was compared with theoretical analysis of molecular vibrations. The result obtained from this comparison confirmed that the chemical modification of the composites was successfully carried out. Keywords : Chemical treatment, Composite, Hydrophilicity, Natural fiber, Thermosetting, Water absorption

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纤维处理对毛柱头增强环氧树脂吸水率的影响

研究了毛柱头纤维与热固性基体(环氧树脂)的14天硬化复合材料的吸水性能。为了研究复合材料的耐久性，进行了吸水试验。通过对纤维增强复合材料和化学改性复合材料在NaOH、kmno4、BPO三种试剂中的吸水性能的对比研究，证实了纤维表面处理对吸附过程的影响。经BPO改性后的毛柱头纤维亲水性下降最为显著，这与毛柱头纤维化学成分的变化有关，尤其是纤维素平均聚合度和半纤维素含量的下降。利用傅里叶变换红外光谱(FTIR)分析了化学成分对表面改性的影响，并将实验光谱信息与分子振动的理论分析结果进行了比较。对比结果证实了复合材料的化学改性是成功进行的。关键词:化学处理，复合材料，亲水性，天然纤维，热固性，吸水性

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