ZnO-石墨烯-TPU/PLA复合材料的制备及吸波性能

吴海华; 傅文鑫; 刘少康; 晁彬; 鲍云天

doi:10.13801/j.cnki.fhclxb.20230627.003

ZnO-石墨烯-TPU/PLA复合材料的制备及吸波性能

doi: 10.13801/j.cnki.fhclxb.20230627.003

吴海华^{1, 2, ,},
傅文鑫^{1, 2},
刘少康^{1, 2},
晁彬^{1, 2},
鲍云天^{1, 2}

1.
三峡大学　机械与动力学院，宜昌 443002
2.
三峡大学　石墨增材制造技术与装备湖北省工程研究中心，宜昌 443002

基金项目: 国家自然科学基金 (51575313)

详细信息

通讯作者:
吴海华，博士，教授，博士生导师，研究方向为3D打印吸波材料及其工程应用技术　E-mail: wuhaihua@ctgu.edu.cn

中图分类号: TB333
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- 被引次数: 0
出版历程
- 收稿日期: 2023-04-27
- 修回日期: 2023-05-24
- 录用日期: 2023-06-11
- 网络出版日期: 2023-06-28
- 刊出日期: 2024-03-01

Study on preparation and absorption properties of ZnO-graphene-TPU/PLA composites

WU Haihua^{1, 2
, ,},
FU Wenxin^{1, 2},
LIU Shaokang^{1, 2},
CHAO Bin^{1, 2},
BAO Yuntian^{1, 2}

1.
College of Mechanical and Power Engineering, China Three Gorges University, Yichang 443002, China
2.
Hubei Engineering Research Center for Graphite Additive Manufacturing Technology and Equipment, China Three Gorges University, Yichang 443002, China

Funds: National Natural Science Foundation of China (51575313)

摘要

摘要: 开发轻质、高效的吸波复合材料是解决电磁污染问题的重要途径之一。本文采用两步法制备ZnO-石墨烯-热塑性聚氨酯弹性体橡胶 (TPU)/聚乳酸 (PLA)吸波复合材料，通过XRD、拉曼光谱、SEM和矢量网络分析仪分别对复合材料的物相结构、微观形貌和电磁特性进行表征，并研究不同ZnO/石墨烯吸波剂组合对复合材料吸波性能的影响，揭示ZnO和石墨烯协同吸波机制。研究结果表明：随着ZnO含量的增加，吸波效果先增强后减弱。适量的ZnO分散在基体中，使复合材料的缺陷程度增加，这丰富了异质界面，增强了界面极化和偶极极化，进而改善了复合材料的吸波性能。当ZnO添加量仅为2wt%时吸波效果最佳，在5.6 mm厚度下，其最小反射损耗为−49.2 dB，有效吸收带宽为2.0 GHz。优异的吸波效果源于良好的阻抗匹配和界面极化损耗、偶极极化损耗、电导损耗之间的协同作用。此外相比化学法制备的吸波材料，ZnO-石墨烯-TPU/PLA复合材料的制备过程简单环保，吸波剂组分可调，轻质高效可规模化生产，有望用于复杂吸波结构制造。
- 复合材料 /
- 石墨烯 /
- ZnO /
- 吸波性能 /
- 阻抗匹配
Abstract: Developing light-weight and high-efficiency absorbing composite materials is one of the important ways to solve the electromagnetic pollution. In this paper, ZnO-graphene (GR)/polylactic acid (PLA)/thermoplastic polyurethane (TPU) composite materials were prepared by a two-step method and the phase structure, micromorphology and electromagnetic characteristics of the composite were characterized by XRD, Raman spectroscopy, SEM and vector network analyzer. The effects of different combinations of ZnO/GR on the microwave absorbing properties of the composites were studied, and the synergistic mechanism was revealed. The results show that with the increase of the content of ZnO, the microwave absorbing effect increases at first and then decreases. Proper amount of ZnO dispersed in the matrix increases the defects of the composites enriching the heterogeneous interface, enhancing the interface polarization and dipolarization, and improving the microwave absorbing properties of the composites. When the content of ZnO is 2wt% , at 5.6 mm thickness, the minimum reflection loss is −49.2 dB and the effective absorption bandwidth is 2.0 GHz meaning the best absorption efficiency. The excellent absorbing effect is attributed to the good impedance matching and the synergy among the interface polarization loss, the dipolarization loss and the conductivity loss. In addition, the preparation process of ZnO-GR/PLA/TPU composite is simple and environment-friendly, and the component of absorbing agent can be adjusted which is expected to be used in the manufacturing of complex absorption structures.
- composites /
- graphene /
- ZnO /
- electromagnetic wave absorbing properties /
- impedance matching

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图 1 石墨烯(GR) (a)和ZnO (b)的SEM图像

Figure 1. SEM images of graphene (GR) (a) and ZnO (b)

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图 2 (a) ZnO-GR-TPU/PLA复合线材；(b) 同轴环

Figure 2. (a) ZnO-GR-TPU/PLA composite filaments; (b) Coaxial rings

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图 3 ZnO-GR-TPU/PLA复合材料XRD图谱(a)和拉曼光谱(b)

Figure 3. XRD patterns (a) and Raman spectra (b) of the ZnO-GR-TPU/PLA composites

I_D/I_G—Intensity ratio of peak D to peak G

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图 4 ZnO-GR-TPU/PLA复合粉末的SEM图像：(a) ZN0；(b) ZN2；(c) ZN4；(d) ZN6；(e) ZN8

Figure 4. SEM images of ZnO-GR-TPU/PLA composite powder: (a) ZN0; (b) ZN2; (c) ZN4; (d) ZN6; (e) ZN8

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图 5 ZnO-GR-TPU/PLA复合材料的电磁参数：(a) 复介电常数实部ε'；(b) 复介电常数虚部ε''；(c) 介电损耗角正切tanδ_e

Figure 5. Electromagnetic parameters of ZnO-GR-TPU/PLA composites: (a) Real part of complex permittivity ε'; (b) Imaginary part of complex permittivity ε''; (c) Dielectric loss tangent tanδ_e

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图 6 ZnO-GR-TPU/PLA复合材料的Colo-Colo曲线：(a) ZN0；(b) ZN2；(c) ZN4；(d) ZN6；(e) ZN8

Figure 6. Colo-Colo curves of ZnO-GR-TPU/PLA composites: (a) ZN0; (b) ZN2; (c) ZN4; (d) ZN6; (e) ZN8

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图 7 ZnO-GR-TPU/PLA复合材料的衰减常数及阻抗匹配

Figure 7. Attenuation constant and impedance matching of ZnO-GR-TPU/PLA composites

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图 8 ZnO-GR-TPU/PLA复合材料的反射损耗图与3D映射图：((a), (b)) ZN0；((c), (d)) ZN2；((e), (f)) ZN4；((g), (h)) ZN6；((i), (j)) ZN8

Figure 8. Reflection loss diagram and 3D mapping diagram of ZnO-GR-TPU/PLA composite materials: ((a), (b)) ZN0; ((c), (d)) ZN2; ((e), (f)) ZN4; ((g), (h)) ZN6; ((i), (j)) ZN8

RL_min—Minimal reflection loss; d—Depth; EAB—Effectively absorb bandwidth

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表 1 ZnO-GR-热塑性聚氨酯弹性体橡胶(TPU)/聚乳酸(PLA)复合材料成分

Table 1. Ingredients of ZnO-GR-thermoplasticpolyurethane (TPU)/polylactic acid (PLA) composites

Sample	Mass fraction/wt%
Sample	ZnO	GR	PLA	TPU
ZN0	0	5	85.5	9.5
ZN2	2	5	83.7	9.3
ZN4	4	5	81.9	9.1
ZN6	6	5	80.1	8.9
ZN8	8	5	78.3	8.7

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表 2 近期文献报道ZnO/石墨烯复合材料的吸波性能

Table 2. Recent literature reports on the absorption properties of ZnO/graphene composites

Materials	Loading/wt%	Matrix	RL_min (Thickness)	Ref.
Starlike ZnO/RGO	75	Paraffin	−77.50 dB (4.5 mm)	[9]
ZnO@RGO	75	Paraffin	−44.50 dB (4.5 mm)	[15]
RGO@NiO/ZnO	70	PS	−42.50 dB (2.15 mm)	[41]
GR/ZnO hollow sphere	50	Paraffin	−45.05 dB (2.2 mm)	[42]
3D-ZFO/GNs	50	Paraffin	−34.56 dB (1.3 mm)	[43]
ZnO/ZnO nanocrystal@RGO foam	25	Paraffin	−38.00 dB (3.2 mm)	[26]
RGO/ZnO-mrs	15	Paraffin	−38.50 dB (2.0 mm)	[44]
MF/ZnO@Reduced graphene oxide	5	Paraffin	−63.20 dB (4.1 mm)	[33]
5wt%GR+2wt%ZnO	7	PLA	−49.20 dB (5.6 mm)	This work
Notes: RGO—Reduced graphene oxide; ZFO—ZnFe₂O₄; GNs—Graphene nanosheets; mrs—Microrods; MF—Carbonized melamine foame; PS—Polystyrene.

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