Study on Dielectric and charge transport behavior in alkali-treated randomly oriented Sunn Hemp Fiber Reinforced epoxy composite in connection with the microstructure of fiber

ABSTRACT

The present research introduces alkalization (KOH) of Sunn Hemp (Crotalaria juncea) fiber with various alkali concentrations (5, 10, 15, and 20 wt %) and the soaking periods (2 hr, 4 hr, 6 hr, 8 hr, and 10 hr). All the composites are fabricated using the hand layout method to study dielectric properties. Dielectric constant $(\epsilon { }^{\mathrm{\prime }}$) and loss (tan δ) are found to be less in 10% treated composite soaked for 6 hr (10 K6) and may attribute to the decline of water affinity polar groups that result in reducing the effect of space charge polarization. The ac conductivity investigation of composites results in an increasing trend accompanied by the concentrations and soaking time, revealing the evolution of charge carriers in the amorphous phase due to excess alkali supply to the fiber. The highest $\epsilon { }^{\mathrm{\prime }}$ and tan δ is obtained in 20 K10 composite assignable to the augmentation of polar groups by forming more amorphous components.

摘要

本文介绍了不同碱浓度（5、10、15、20wt%）和浸泡时间（2h、4h、6h、8h、10h）对大麻纤维的碱化作用. 所有的复合材料都是用手工排版的方法制备的，以研究其介电性能. 经10%处理的复合材料浸泡6hr（10K6）后，介电常数（ε^’）和损耗（tanδ）减小，这可能是由于亲水性极性基团的减少，从而降低了空间电荷极化的影响. 对复合材料的交流电导率的研究表明，随着溶液浓度和浸泡时间的增加，复合材料的交流电导率呈上升趋势，揭示了由于过量的碱供给纤维而导致的非晶相载流子的演化. 在20K10复合材料中获得了最高的ε^’和tanδ，这归因于通过形成更多的非晶态组分来增加极性基团.

KEYWORDS:

• Structure
• morphology
• thermoset
• composite
• dielectric properties
• crosslinking

关键词:

• 结构
• 形态学
• 热固性
• 混合成的
• 介电性能
• 交联

Declaration of Competing Interest

The authors declare that they have no known competing financial interests or personal relationships, which have, or could be perceived to have, influenced the work reported in this article.