橡胶木屑基活性炭—聚氨酯复合材料的制备及其微波吸收性能

Azizah Shaaban; Sian-Meng Se; Imran Mohd Ibrahim; Qumrul Ahsan

doi:10.1016/S1872-5805(15)60182-2

橡胶木屑基活性炭—聚氨酯复合材料的制备及其微波吸收性能

doi: 10.1016/S1872-5805(15)60182-2

1.
Department of Engineering Materials, Faculty of Manufacturing Engineering, Universiti Teknikal Malaysia Melaka (UTeM), Hang Tuah Jaya76100 Durian Tunggal, Melaka, Malaysia;
2.
Department of Telecommunication, Faculty of Electronics and Computer Engineering, Universiti Teknikal Malaysia Melaka (UTeM), Hang Tuah Jaya76100 Durian Tunggal, Melaka, Malaysia

详细信息

作者简介:
Azizah Shaaban, Ph.D, Associate Professor. E-mail: azizahs@utem.edu.my

通讯作者:
Sian-Meng Se, Ph. D Candidate. E-mail: sianmeng@gmail.com

中图分类号: TB332
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- 文章访问数: 704
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- 被引次数: 0
出版历程
- 收稿日期: 2015-01-30
- 录用日期: 2015-05-04
- 修回日期: 2015-04-10
- 刊出日期: 2015-04-28

Preparation of rubber wood sawdust-based activated carbon and its use as a filler of polyurethane matrix composites for microwave absorption

1.
Department of Engineering Materials, Faculty of Manufacturing Engineering, Universiti Teknikal Malaysia Melaka (UTeM), Hang Tuah Jaya 76100 Durian Tunggal, Melaka, Malaysia;
2.
Department of Telecommunication, Faculty of Electronics and Computer Engineering, Universiti Teknikal Malaysia Melaka (UTeM), Hang Tuah Jaya 76100 Durian Tunggal, Melaka, Malaysia

摘要

摘要: 采用ZnCl₂对橡胶木屑进行化学活化制备出活性炭。ZnCl₂与橡胶木屑的浸渍质量比为1.0-2.0,活化温度为500 ℃,时间为 60 min。通过扫描电镜、X射线衍射和BET比表面分析仪探讨浸渍比例对活性炭孔结构的影响。结果表明,当浸渍比为1.5:1时,样品的比表面积和孔径分别为1 301 m²/g 和0.37 cm³/g。通过化学发泡工艺将不同质量分数(1%, 2%, 3%, 5%, 8%)的活性炭填充至聚氨酯中制备出聚氨酯复合材料。在1-5 GHz频率范围内,复合材料吸收微波。随着活性炭含量增加,在1-3 GHz范围内,介电常数(ε')和回波损耗增加。活性炭含量为8%时复合材料的介电常数达到最大值3.0。在1.8 GHz时,复合材料的回波损耗为10 dB。在-2.5 GHz,电磁屏蔽效率大于3 dB。与传统聚合物材料如填加金属的聚氨酯和聚酯相比,所制复合材料呈微波段吸收,可作为电磁屏蔽材料。
- 橡胶木屑 /
- 化学活化 /
- 活性炭 /
- 微波吸收材料 /
- 介电常数 /
- 回波损耗
Abstract: Activated carbons were prepared from rubber wood sawdust by chemical activation using ZnCl₂ as an activation agent at 500 ℃ for 60 minutes with ZnCl₂/dried rubber wood sawdust mass ratios from 1.0 to 2.0. Flat polyurethane (PU) composites filled with the activated carbons were prepared by a chemical foaming method using different loading amounts of the activated carbons to investigate their complex permittivity and the microwave absorption properties for use in electromagnetic interference (EMI) shielding. It was found that the best activated carbon is obtained at a ratio of 1.5, which has the highest Brunauer-Emmett-Teller surface area and a micropore volume of 1 301 m²/g and 0.37 cm³/g, respectively. With increasing activated carbon content, the dielectric constant (ε') and the return loss increase in the frequency range of 1-3 GHz. The composite filled with 8% activated carbon has a maximum dielectric constant of 3.0 and its return loss is above 10 dB at the global system mobile phone frequency of 1.8 GHz. Its EMI shielding efficiency is in the useful range of approximately 3 dB over a wide frequency range of 1-2.5 GHz. Compared with conventional materials such as polyethelene and polyester filled with metal additives, this composite is suitable for microwave absorption and is a potential candidate for EMI shielding applications.
- Rubber wood sawdust /
- Chemical activation /
- Activated carbon /
- Microwave absorbing material /
- Dielectric /
- Return loss

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