苯并咪唑杂环改性芳纶的结构与性能  

Structure and properties of modified aramid fibers by benzoquinolizine heterocycle

作　　者：王凤德[1,2] 陈超峰 彭涛 韩哲文[1] 

机构地区：[1]华东理工大学材料科学与工程学院,上海200237 [2]中蓝晨光化工研究设计院有限公司,成都610041

出　　处：《固体火箭技术》2012年第4期536-540,共5页Journal of Solid Rocket Technology

摘　　要：采用X衍射仪、强力仪、热失重仪及动态热分析仪等研究了K49、PABI及2种芳纶ⅢF3-1和F3-2的结晶性能、力学性能、热性能、动态热机械性能及热氧老化性能等,并根据结果分析了芳纶结构对性能的影响。力学性能分析结果显示,杂环结构的引入大幅度提高了纤维的强度和模量,F3-1、F3-2和PABI的干纱强度较K49分别提高61.2%、70.5%和67.2%。热氧老化实验表明,在250℃下经192 h老化后,K49、F3-1、F3-2和PABI的强度保持率分别为30%、78%、80%和68%,说明杂环结构的存在提高了纤维的热氧化稳定性。杂环结构的引入导致结晶度、初始热分解温度和玻璃化转变温度有所降低,但DMA的结果显示,杂环芳纶在200℃以内的动态模量较K49高出很多。The properties of four aramid fibers including K49, F31, F32 and PABI, were characterized in detail by mechanical testing, Xray diffraction （XRD） analysis, thermal gravimetric analysis （ TGA）, dynamic thermal mechanical analysis （ DMA ） and thermaloxidative aging experiment. Meanwhile, the effects of structure on properties were analyzed accordingly. The results show that the introduction of heterocyclic structure into the polymer backbone increases the mechanical properties of fiber significantly. Tensile strength of F31 ,F32 and PABI are 61.2% ,70.5% and 67.2% higher than that of K49,respectively. Experimental re suits of thermaloxidative aging indicate that heterocyclic aramid fibers possess excellent thermooxidative stability. The strength re tention of K49, F31, F32 and PABI are 30% ,78% ,80% and 68% below 250 ℃ for aging 192 h. Though the introduction of het erocyclic structure decreases the crystallinity, initial decomposition temperature and glass transition temperature of aramid fibers, it increases the dynamic modulus （ below 200 ℃ ） of aramid fibers.

关 键 词：芳纶Ⅲ 杂环芳纶 对位芳纶 结构与性能 动态热机械分析 

分 类 号：V258.3[一般工业技术—材料科学与工程]