新型炭材料（中英文）2023，Vol.38Issue(6)：1135-1142,8.DOI:10.1016/S1872-5805(23)60712-7
基于拉曼光谱mapping技术研究低温循环对炭纤维增强聚酰亚胺复合薄膜界面微观力学的影响
Raman mapping microspectroscopy of the effects of cryogenic cycling on the interfacial micromechanics of carbon fiber-reinforced polyimide composites
摘要
Abstract
Raman spectroscopy has unique advantages in studying the micro-mechanical behavior of interfaces.Carbon nanotubes(CNTs)acting as stress sensors were added to both polyimide films(CNT-PI)and those reinforced with carbon fibers(CF/CNT-PI).Raman mapping microspectroscopy was then used to investigate the interfacial stress distributions of the films during different cryogenic-room temperature cycles(-198-25°C,0-300 cycles).It was found that the micro stress of CNT-PI films(around 175 MPa)had no significant changes even after 300 cycles.The cryogenic cycling had very little effect on the internal stress,indicating that PI had a good low temperature resistance.For the CF/CNT-PI films,the micro stress distributions of CFs,interface,and matrix regions were successfully obtained.It was found that the CFs bear a greater stress than the matrix,showing that CFs had always been the major stress bearer,confirming the strengthening effect of CFs.When the CF/CNT-PI films were cycled fewer than 250 times,the effect of cryogenic cycling on the micro stress was insignificant.But once the number of cycles reached 300,the compressive stresses on the fiber and interface increased by 21%and 12.9%,respectively,implying a deterioration of the mechanical properties.By Raman mapping,the micro-mechanical distributions of the reinforced material,matrix and interface of the composites under cyclic temperature changes were effectively quantified.This is therefore an effective method for evaluating the safety of composite materials.关键词
炭纤维/界面微观力学/拉曼mapping/低温循环Key words
CF/Interfacial micro-mechanics/Raman mapping/Cryogenic cycles分类
化学化工引用本文复制引用
贾立双,吴琪琳,陈惠芳..基于拉曼光谱mapping技术研究低温循环对炭纤维增强聚酰亚胺复合薄膜界面微观力学的影响[J].新型炭材料（中英文）,2023,38(6):1135-1142,8.基金项目
National Key R&D Program of China(2016YFB0303201)感谢国家重点研发计划项目(2016YFB0303201). （2016YFB0303201）
