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首页> 外文期刊>Journal of Composite Materials >Influence of pretreatment on mechanical and dielectric properties of short sunn hemp fiber-reinforced polymer composite in correlation with fine structure of the fiber
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Influence of pretreatment on mechanical and dielectric properties of short sunn hemp fiber-reinforced polymer composite in correlation with fine structure of the fiber

机译：预处理对纤维精细结构相关性的短SUNN大麻纤维增强聚合物复合材料机械和介电性能的影响

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摘要

Present investigation is aimed on chemically modified of Sunn Hemp (Crotalaria juncea) fiber for composite fabrication. An increment in cellulose crystallinity with crystallite size is observed from X-ray diffraction study. The signature of impurities removal and an uneven surface are confirmed from Fourier Transmission Infrared Spectroscopy and Field Emission Scanning Electron Microscopy. Afterwards, both raw sunn hemp-reinforced fiber composite and dewaxed sunn hemp fiber-reinforced composite were fabricated using hand lay out method and the mechanical as well as dielectric properties of composite are studied. A better mechanical strength is found in DSHC which may attribute to rough surface and increased cellulose crystallinity through dewaxing process that promoted a fine interfacial bonding between fiber and matrix. Dielectric constants and losses are found to be less in dewaxed sunn hemp fiber-reinforced composite in comparison to raw sunn hemp-reinforced fiber composite due to decrease of water polar groups, which lead to lessening the effect of space charge polarization by treatment. Complex impedance and modulus study revealed the presence of single relaxation process in both systems. Lower ac conductivity value is observed in dewaxed sunn hemp fiber-reinforced composite due to decreasing of conducting polar OH groups. As a whole, the effort is established to correlate the mechanical and dielectric properties with fine structural parameters of the fiber.
机译：目前的研究旨在对Sunn Hemp（Crotalaria Juncea）纤维进行化学修饰的复合制造。从X射线衍射研究中观察到具有微晶尺寸的纤维素结晶度的增量。从傅里叶传输红外光谱和场发射扫描电子显微镜确认杂质和不平坦表面的签名。然后，使用手放置方法制造了原始SUNN大麻增强纤维复合材料和脱蜡SOMN大麻纤维增强复合材料，以及机械以及复合材料的电介质性能。在DSHC中发现了更好的机械强度，其可能通过脱蜡过程归因于粗糙表面和增加纤维素结晶度，该方法在纤维和基质之间促进细细的界面键合。由于水极性群体的降低，脱蜡SOMN大麻纤维增强复合材料脱蜡型SUNN大麻纤维复合材料的介电常数和损失较少，这导致通过处理减少空间电荷极化的影响。复杂阻抗和模量研究显示两个系统中的单一放松过程的存在。由于导电极性OH基团的降低，在脱蜡SOMN大麻纤维增强复合材料中观察到较低的AC电导率值。总的来说，建立努力以将机械和介电性能与纤维的细结构参数相关联。

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