摘要
随着世界各国对环境保护的重视,可再生、可降解的天然植物纤维复合材料逐渐成为研究焦点。为探究天然植物纤维的规模化利用,选取新疆地区角果藜为研究对象,通过钛酸酯偶联剂(NDZ-201)的表面改性,借助模压工艺制备角果藜/环氧树脂(50/50)复合材料。凭借傅里叶变换红外光谱(FTIR)仪、万能力学试验机、邵氏硬度计、扫描电子显微镜(SEM)和动态热机械分析(DMA)仪等研究角果藜纤维表面改性对复合材料力学性能、结构形态和热稳定性的影响。FTIR结果表明,经偶联剂处理后,角果藜纤维表面羟基含量减少,且出现Ti—O吸收峰;随着NDZ-201质量分数的增加,复合材料的力学性能逐渐增加,并在NDZ-201的质量分数为1%时,复合材料的弯曲强度(73.3 MPa)和硬度(93.8HD)达到最大值,与未改性相比,分别提高了21.8%和6.0%;SEM结果证实,经偶联剂处理的角果藜纤维在环氧树脂基体中的排列更加整齐有序,且材料中无孔洞;DMA结果表明,改性后复合材料的储能模量得到进一步提高,玻璃化转变温度由94℃上升到98℃,表明经过偶联剂改性后,角果藜与环氧树脂之间作用力进一步加强,这是由于环氧树脂分子链段运动受到抑制所致。
With the world's attention to environmental protection,renewable and degradable natural plant fibre composites have gradually become the focus of research.In order to explore the large-scale utilization of natural plant fibre,ceratocarpus arenarius from Xinjiang region as the research object was selected,and ceratocarpus arenarius/epoxy resin(50/50)composite was prepared with the help of moulding process through the surface modification of titanate coupling agent(NDZ-201).The effects of ceratocarpus arenarius fibre surface modification on the mechanical properties,structural morphology and thermal stability of the composites were investigated by means of fourier transform infrared spectroscopy(FTIR),universal mechanical tester,shore hardness tester,scanning electron microscope(SEM),and dynamic mechanical analyser(DMA),etc.FTIR analysis show that Ti—O absorption peaks appear in the treated ceratocarpus arenarius fibre and the hydroxyl content on the fibre surface is reduced.Mechanical testing of the composites confirm the mechanical strength enhancement with increasing NDZ-201 mass fraction of modified ceratocarpus arenarius fibre,and the flexural strength(73.3 MPa)and hardness(93.8 HD)of the composites reaches the maximum values at 1%mass fraction of NDZ-201,which are 21.8%and 6.0%higher than those of the unmodified composites.The SEM results confirm that the ceratocarpus arenarius fibre treated with the coupling agent are more neatly and orderly arranges,and there are no holes in the material.The DMA results show that the energy storage modulus of the modified composites is further improved and the glass transition temperature of the composites is increased from 94℃to 98℃.This indicates that after modification with coupling agents,the interaction force between the ceratocarpus arenarius and epoxy resin is further strengthened,and the movement of epoxy resin molecular segments is inhibited.
作者
樊东焱
马扶宸
杜涛
朱智慧
钱大益
宋剑斌
FAN Dongyan;MA Fuchen;DU Tao;ZHU Zhihui;QIAN Dayi;SONG Jianbin(School of Chemistry and Chemical Engineering,YiLi Normal University,Yining 835000,China;Xinjiang Key Laboratory of Clean Conversion and High Value Utilization of Biomass Resources,Yining 835000,China)
出处
《工程塑料应用》
CAS
CSCD
北大核心
2024年第7期37-42,共6页
Engineering Plastics Application
基金
伊犁师范大学校级科研项目(2023YSZD001)。
关键词
钛酸酯
角果藜
环氧树脂
力学性能
微观形貌
titanate
ceratocarpus arenarius
epoxy resin
mechanical property
microstructure
