木质素基燃料电池双极板的制备及性能研究
宋剑斌, 周为明, 张明昕, 袁占辉
福建农林大学材料工程学院中国林业科学研究院木材工业研究所
摘要：为了充分利用木质素，扩大其在复合材料的应用范围,采用木质素、苯酚和甲醛合成了木质素基酚醛树脂。以天然石墨和碳纤维做导电填料，采用模压工艺制备燃料电池用双极板材料。对复合材料的密度、弯曲性能、动态力学性能和电导率进行表征分析。结果表明，当天然石墨逐步被碳纤维取代后，木质素基复合材料的密度随着碳纤维含量的增加而逐渐下降；弯曲强度则一直增加，但是弯曲模量在碳纤维达到30%时达到最大值，之后开始下降。动态力学性能实验表明，材料的储能模量和玻璃化转变温度随着碳纤含量增加而增加，并在30%碳纤维时达到最高值。复合材料的电导率随着碳纤维含量增加而增加，最大达到500 S/cm，之后复合材料的电导率开始下降。研究结果证明，含有30%碳纤维和30%天然石墨的木质素基复合材料具有较好的综合性能:密度为1.16 g/cm3,弯曲强度和弯曲模量分别为52.7 MPa和10.7 GPa，电导率500 S/cm。
关键字：关键词：木质素; 双极板; 电导率; 动态力学性能; 酚醛树脂
A Study on Lignin Based Bipolar Plates for Fuel Cells
SONG Jian-bin， ZHOU Wei-ming， ZHANG Min-xin， YUAN Zhan-hui
Abstract: In order to make full use of lignin and expand its application in composites， the paper reported a method to prepare lignin based phenolic resin． Selecting natural graphite and carbon fiber (CF) as conductive fillers， bipolar plates materials were fabricated using molding processing． The density， flexural properties， dynamical performance and electrical conductivity of composites were characterized． The results showed that the density of composites decreased as CF content increased when natural graphite was replaced by CF gradually． The flexural strength showed an increase with CF content， but flexural modulus got to the maximum value at 30%CF addition， and then decreased． The dynamical mechanical analysis ( DMA) tests showed that storage modulus and glass transition temperature also reached the maximum at 30%CF addition．The electrical conductivity of composites increased as CF content increased and the maximum value was determined to 500 S /cm and then it decreased with increasing CF content． The research indicates that the composites with 30%natural graphite and 30%CF exhibites good properties: its density is 1. 16 g /cm3， the flexural strength and modulus are 52. 7 MPa and 10. 7 GPa， respectively; the electrical conductivity is 500 S /cm．
Keywords: Lignin; Bipolar Plates; Electrical Conductivity; Dynamical Mechanical Properties; Phenolic Resin
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木质素基燃料电池双极板的制备及性能研究.pdf
