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

张静静; 梁森; 汤超

doi:10.13801/j.cnki.fhclxb.20220922.004

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

doi: 10.13801/j.cnki.fhclxb.20220922.004

张静静^1, ,,
梁森¹,
汤超²

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

基金项目: 国家自然科学基金 (52075280)

详细信息

通讯作者:
张静静，博士，副教授，硕士生导师，研究方向为树脂基复合材料成型技术及界面强化　E-mail: zhangjingjing@qut.edu.cn

中图分类号: TB332
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- 被引次数: 0
出版历程
- 收稿日期: 2022-08-03
- 修回日期: 2022-09-05
- 录用日期: 2022-09-11
- 网络出版日期: 2022-09-23
- 刊出日期: 2023-07-15

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

1.
School of Mechanical & Automotive Engineering, Qingdao University of Technology, Qingdao 266520, China
2.
School of Mechanical Engineering, Tsinghua University, Beijing 100084, China

Funds: National Natural Science Foundation of China (52075280)

摘要

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 nm²最高提高至微波辐射180 s后的21.7 nm和26.4 nm²；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。
- 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
Abstract: 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.
- carbon fiber modification /
- microwave irradiation /
- electron beam cure /
- resin matrix composites /
- interface /
- molecular dynamics

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图 1 AFM试样示意图

Figure 1. AFM specimen diagram

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图 2 碳纤维(CF)单丝拉伸强度测试

Figure 2. Carbon fiber (CF) monofilament tensile strength test

F—Force

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图 3 界面剪切强度实验

Figure 3. Interfacial shear strength test

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图 4 碳纤维增强树脂基复合材料(CFRP)分子动力学模型

Figure 4. Molecular dynamics models of carbon fiberreinforced polymer (CFRP)

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图 5 不同微波辐射时间下CF表面微观形貌图及沟壑特征分析

Figure 5. Surface morphology and furrow characteristics of CFs at different microwave irradiation times

Δx—Groove width; Δz—Groove depth

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图 6 不同微波辐射时间下CF表面粗糙度及表面积

Figure 6. Surface roughness and area of CF at different microwave irradiation time

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图 7 不同微波辐射时间下CF表面官能团含量

Figure 7. Group contents of CF surfaces at different microwave irradiation time

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图 8 CF与树脂分子间的静电吸附作用

Figure 8. Electrostatic interactions between CF and resin molecules

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图 9 CF及树脂分子在纤维表面法向的浓度分布

Figure 9. Molecular concentration distribution of CF and epoxy resin along CF surface normal direction

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图 10 不同微波辐射时间下CF/树脂界面能

Figure 10. Interfacial energy between CF/epoxy resin at different microwave irradiation time

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图 11 不同微波辐射时间下CFRP界面剪切强度(IFSS) (a)及单因素方差(ANOVA)分析结果 (b)

Figure 11. Interfacial shear strength (IFSS) at different microwave irradiation time (a) and one-way analysis of variance (ANOVA) analysis results (b)

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图 12 IFSS测试后碳纤维/树脂界面的微观形貌

Figure 12. Microscopic morphologies of CFRP interface after IFSS tests

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表 1 不同微波辐射时间下CF表面氧碳原子比

Table 1. O/C atomic ratio of CF surface at different microwave irradiation time

Microwave irradiation time/s	0	30	60	90	120	180
O/C	0.2578	0.2671	0.2856	0.3093	0.3141	0.3278

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表 2 不同微波辐射时间下CF与树脂的非键作用能

Table 2. Nonbonding energy between CF and epoxy resin at different microwave irradiation time

Model	I⁽⁰⁾	I⁽³⁰⁾	I⁽⁶⁰⁾	I⁽⁹⁰⁾	I⁽¹²⁰⁾	I⁽¹⁸⁰⁾
Nobonding energy/(kcal·mol⁻¹)	−472.152	−479.332	−498.493	−517.594	−519.104	−514.347
Van der waals energy/(kcal·mol⁻¹)	−374.251	−373.541	−380.201	−382.984	−377.877	−373.692
Electrostatic energy/(kcal·mol⁻¹)	−97.901	−105.791	−118.284	−134.61	−141.217	−140.655
Notes: I^(t)—Specimens with CFs irradiated by microwave for t seconds; t—Microwave irradiation time (s).

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表 3 不同微波辐射时间下CF单丝的拉伸强度

Table 3. CF monofilament tensile strength at different microwave irradiation time

Microwave irradiation time/s	0	30	60	90	120	180
Tensile strength/GPa	5.296	5.328	5.214	5.172	4.991	4.84

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