摘要
为了提高Lyocell基炭纤维的得率及其力学性能,纺制了MWCNT/Lyocell纤维并以此为原丝制备了炭纤维。采用广角X-衍射(WAXD)、热失重分析(TGA)、扫描电镜(SEM)、强度仪等分析了试样的结构与性能。结果表明:MWCNT/Lyocell纤维具有纤维素II晶型的结构,纤维表面光滑且截面为圆形,符合优质炭纤维原丝的要求。以此为原丝所制炭纤维中,MWCNTs分布均匀;与纯Lyocell基炭纤维相比,掺杂MWCNTs的Lyocell基炭纤维的力学性能明显提高,其中,掺杂质量分数1%MWCNTs的Lyocell基炭纤维的强度和模量分别比纯Lyocell基炭纤维提高70%和116%。同时掺杂MWCNTs还可以提高Lyocell纤维的热稳定性,进而提高Lyocell基炭纤维的得率。
Multi-walled carbon nanotube （MWCNT）/Lyocell composite fibers were prepared and used as a precursor of carbon fibers to improve the mechanical properties of Lyocell-based carbon fibers. The structure and properties of the samples were investigated by wide angle XRD （WAXD）, SEM, TGA and tensile tester. WAXD patterns showed that the composite precursor still had a cellulose Ⅱ crystal structure. TGA curves showed that the thermal stability of the composite precursor was improved by the addition of the MWCNTs and the yield of the resulting carbon fibers could be increased. The SEM results showed that the surface and the cross-section of MWCNT/Lyocell composite fibers were smooth and round, which can meet the requirements of a carbon fiber precursor. MWCNTs were dispersed uniformly in the resulting carbon fibers. Compared with pure Lyocell-based carbon fibers, the tenacity and modulus of Lyocell-based composite carbon fibers containing 1% MWCNTs were increased by 70% and 116%, respectively.
出处
《新型炭材料》
SCIE
EI
CAS
CSCD
北大核心
2011年第5期368-374,共7页
New Carbon Materials
基金
国家自然科学基金项目(50873024
50673016)
863计划项目(2009AA03Z425)~~
