文章信息/Info

Title:

Preparation of Carbon Fiber Enhanced Woodiness  Composites and Its Electrical Properties

作者:

孫麗萍; 朱曉龍; 張冬妍

東北林業(yè)大學(xué)機(jī)電工程學(xué)院

Author(s):

SUN Liping; ZHU Xiaolong; ZHANG Dongyan

College of Mechanical and Electrical Engineering, Northeast Forestry University

關(guān)鍵詞:

碳纖維增強(qiáng)木質(zhì)復(fù)合材料; 電學(xué)性能; π電子; NTC效應(yīng)

DOI:

10.7502/j.issn.1674-3962.2016.11.10

文獻(xiàn)標(biāo)志碼:

A

摘要:

采用脲醛樹脂作為粘合劑配合異氰酸酯制備了碳纖維增強(qiáng)木質(zhì)復(fù)合材料（Carbon Fiber Enhanced Woodiness Composites,CFEWC）。在制備過程中，通過改變碳纖維和木質(zhì)纖維的配比和兩種纖維之間的復(fù)合形式，研究了復(fù)合材料樣板的相關(guān)電學(xué)性能，并且從多個角度分析了樣板電學(xué)性能變化的原因。實驗結(jié)果表明：單貼面復(fù)合材料樣板和雙貼面復(fù)合材料樣板都具有導(dǎo)電性，雙貼面復(fù)合材料樣板具有更良好的導(dǎo)電性。隨著碳纖維含量比重的增大，CFEWC的導(dǎo)電性能逐漸提高，空穴導(dǎo)電和π電子的數(shù)量增加；隨著溫度的升高，CFEWC的表面電阻率呈現(xiàn)出非線性的負(fù)增長態(tài)勢，更多的導(dǎo)電粒子獲得能量被激發(fā)產(chǎn)生了NTC（Negative Temperature Coefficient）效應(yīng)。

Abstract:

Urea formaldehyde resin was selected as adhesive and worked with isocyanate resin to prepare carbon fiber enhanced woodiness composites (CFEWC) . In the preparation process, the mixture ratios of carbon fiber and wood fiber and the complex forms were altered. The related electrical properties of CFEWCs were studied. Besides, the reasons for the changes of electrical properties were also analyzed from different aspects. The results showed that both single�瞫ided composites and double�瞫ided composites could conduct electricity. Compared with single�瞫ided CFEWC, double�瞫ided composites had better electrical conductivity. The electrical conductivity of CFEWC improved with carbon fiber content increased while a certain condition prevails. Besides, the quantity of hole conduction and π electron increased. The surface resistivity represented a negative growth situation with increasing the temperature. A great many of conducting particles were motivated which led to a negative temperature coefficient (NTC) effect.