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/cm^3,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。
In order to make full use of lignin and expand its application in composites, the paperreported 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, flexuralproperties, dynamical performance and electrical conductivity of composites were characterized. The resultsshowed that the density of composites decreased as CF content increased when natural graphite was replaced byCF gradually. The flexural strength showed an increase with CF content, but flexural modulus got to themaximum value at 30% CF addition, and then decreased. The dynamical mechanical analysis （DMA） testsshowed 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 wasdetermined to 500 S/cm and then it decreased with increasing CF content. The research indicates that thecomposites with 30% natural graphite and 30% CF exhibites good properties ： its density is 1.16 g/cm3 , theflexural strength and modulus are 52. 7 MPa and 10.7 GPa, respectively; the electrical conductivity is 500S/Zcm,
作者
宋剑斌
周为明
张明昕
袁占辉
SONG Jian-bin , ZHOU Wei-ming1, ZHANG Min-xin, YUAN Zhan-hui(1. College of Materials Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, China; 2. Research Institute of Wood Industry, Chinese Academy of Forestry, Beijing 100091, Chin)
出处
《塑料工业》
CAS
CSCD
北大核心
2018年第3期147-150,154,共5页
China Plastics Industry
基金
中国博士后基金(2016T90150
2014 M560138)
中科院大连化物所开放基金
关键词
木质素
双极板
电导率
动态力学性能
酚醛树脂
Lignin
Bipolar Plates
Electrical Conductivity
Dynamical Mechanical Properties
Phenolic Resin
