微波对碳纤维的改性作用及其对电子束固化CFRP界面性能的影响  

Modification of carbon fiber by microwave and its effect on interfacial properties of electron beam cured CFRP

作　　者：张静静 梁森 汤超 ZHANG Jingjing;LIANG Sen;TANG ChaO(School of Mechanical&Automotive Engineering,Qingdao University of Technology,Qingdao 266520,China;School of Mechanical Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]青岛理工大学机械与汽车工程学院,青岛266520 [2]清华大学机械工程学院,北京100084

出　　处：《复合材料学报》2023年第7期3900-3911,共12页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(52075280)~~。

摘　　要：电子束原位固化迎合“双碳”战略下碳纤维增强树脂基复合材料(CFRP)低成本控形控性的一体化制造需求,但却因固化构件界面质量差而尚未迈向工业化。本文围绕电子束固化CFRP弱界面的高效、高工业可行性强化技术,探索了微波短时辐射改性碳纤维改善界面的机制及工艺,阐明了碳纤维表面物理形貌、粗糙度及化学成分在不同微波辐射工艺参数下的演变规律:碳纤维表面的粗糙度和表面积,由未改性时的4.41 nm和7.5 nm~2最高提高至微波辐射180 s后的21.7 nm和26.4 nm~2;O/C原子比也由未改性时的0.2578最高增至辐射180 s时的0.3278。进一步地,构建了界面分子动力学模型,从分子层面细化并深化了羧基及羟基强化界面的本质,及其对界面结构及界面能的影响。界面剪切强度测试结果表明,在微波辐射(90 s)的物理及化学改性双重作用下,碳纤维/树脂界面获得了20.47%的提高。该研究为高性能电子束固化CFRP的绿色成型制造提供基础与支撑,具有重要的科学意义。For carbon fiber reinforced polymer matrix composites(CFRP),the in-situ electron beam(E-Beam)curing meets the requirements of integrated manufacturing of shape and performance,which is low-cost according with the"carbon peak and carbon neutralization"strategy.But the E-Beam technology has not yet been industrialized due to the poor interface quality of cured components.Addressing the weak interface of E-Beam cured CFRP,the mechanism and technology of an efficient and high industrial feasibility strengthening technology by microwave short-time radiation were explored in this study.The evolution of physical morphology,roughness and chemical composition of carbon fiber surface under different microwave radiation process parameters was described,showing that the surface roughness,surface area and the O/C atomic ratio of CFs increased from 4.41 nm,7.5 nm2,0.2578 at 0 s irradiation to 21.7 nm,26.4 nm2,and 0.3278 respectively after 180 s microwave irradiation.Furthermore,a molecular dynamics model of the interface was constructed to refine and deepen the nature of the carboxyl and hydroxyl enhanced interface from the molecular level,and then their effects on the interface structure and interface energy.The experimental results show that the interfacial shear strength of carbon fiber/resin is improved by 20.47%under the combined effect of physical and chemical modification of microwave radiation(90 s).This research provides the foundation and support for green forming manufacturing of high-performance E-Beam cured CFRP,and has important scientific significance.

关 键 词：碳纤维改性 微波辐射 电子束固化 树脂基复合材料 界面 分子动力学 

分 类 号：TB332[一般工业技术—材料科学与工程]