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

東北林業大學機電工程學院

Author(s):

SUN Liping; ZHU Xiaolong; ZHANG Dongyan

College of Mechanical and Electrical Engineering, Northeast Forestry University

關鍵詞:

碳纖維增強木質復合材料; 電學性能; π電子; NTC效應

DOI:

10.7502/j.issn.1674-3962.2016.11.10

文獻標志碼:

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木質復合材料（Carbon Fiber Enhanced Woodiness Composites,CFEWC）。在制備過程中，通過改變碳纖維和木質纖維的配比和兩種纖維之間的復合形式，研究了復合材料樣板的相關電學性能，并且從多個角度分析了樣板電學性能變化的原因。實驗結果表明：單貼面復合材料樣板和雙貼面復合材料樣板都具有導電性，雙貼面復合材料樣板具有更良好的導電性。隨著碳纖維含量比重的增大，CFEWC的導電性能逐漸提高，空穴導電和π電子的數量增加；隨著溫度的升高，CFEWC的表面電阻率呈現出非線性的負增長態勢，更多的導電粒子獲得能量被激發產生了NTC（Negative Temperature Coefficient）效應。

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.