云母纳米片辅助制备芳纶纳米纤维增强复合薄膜力学性能与绝缘性能

李楠; 陆赵情; 汪洋; 宁逗逗; 闫宁; 花莉; 俄松峰

云母纳米片辅助制备芳纶纳米纤维增强复合薄膜力学性能与绝缘性能

李楠¹,
陆赵情^1, ,,
汪洋¹,
宁逗逗¹,
闫宁^{1, 2},
花莉¹,
俄松峰¹

1.
陕西科技大学　轻工科学与工程学院, 陕西省造纸技术及特种纸品开发重点实验室, 轻化工程国家级实验教学示范中心, 中国轻工业纸基功能材料重点实验室, 西安 710021
2.
华南理工大学　制浆造纸工程国家重点实验室, 广州 510640

基金项目: 国家自然科学基金项目(22378248)；陕西省自然科学基础研究计划资助项目(2022JQ-099)

详细信息

通讯作者:
陆赵情，博士，教授，博士生导师，高性能纤维和纸基功能材料　E-mail：luzhaoqing302@163.com

中图分类号: TQ342+.73;TB332
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- 文章访问数: 47
- HTML全文浏览量: 24
- 被引次数: 0
出版历程
- 收稿日期: 2023-12-25
- 录用日期: 2024-02-02
- 网络出版日期: 2024-03-27

Mica nanosheets splitting of aramid fiber and enhanced mechanical and insulation performances of the composites nanofilms

LI Nan¹,
LU Zhaoqing^{1
, ,},
WANG Yang¹,
NING Doudou¹,
YAN Ning^{1, 2},
HUA Li¹,
E Songfeng¹

1.
Shaanxi University of Science & Technology, College of Bioresources Chemical and Materials Engineering, Shaanxi Province Key Laboratory of Paper-marking Technology and Specialty Paper, National Demonstration Center for Experimental Light Chemistry Engineering Education, Key Laboratory of Paper Based Functional Materials of China National Light Industry, Xi’an, 710021, China
2.
State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, 510640, China

Funds: National Natural Science Foundation of China (22378248)；Natural Science Basic Research Program of Shaanxi (No.2022JQ-099)

摘要

摘要: 芳纶纳米纤维 (ANF)兼具芳纶纤维轻质、高强高模、耐高温等的特点以及高性能纤维纳米尺度效应的双重优势，其薄膜强韧化受到研究者的广泛关注。本研究采用高速机械球磨法制备云母纳米片 (MNSs) 作为增强体，将其引入芳纶纤维的裂解过程中，在二甲基亚砜/氢氧化钾 (DMSO/KOH) 体系中制备芳纶纳米纤维，通过真空辅助过滤法制备ANF/MNS复合薄膜，重点探究了MNS含量对ANF薄膜力学性能的影响。结果表明：当MNS含量为0.041 wt.% 时所制备的薄膜力学性能和绝缘性能均最佳，拉伸强度可达249.3 MPa、韧性36.7 MJ·m⁻³、介电击穿强度46.2 kV·mm⁻¹，与原始ANF薄膜相比，分别提升了45.1%、197.1%和60.0%。纳米尺度的MNS可以与ANF形成强的界面相互作用，MNS的固有强度对纳米薄膜力学性能的提升也有重要贡献。
- 芳纶纳米纤维 /
- 云母纳米片 /
- 复合薄膜 /
- 力学性能 /
- 绝缘性能
Abstract: The mica nanosheets (MNSs) were prepared by high-speed mechanical ball milling as the reinforcement, and introduced into the splitting process of aramid fibers. The aramid nanofibers (ANFs) were prepared in a dimethyl sulfoxide/potassium hydroxide (DMSO/KOH) system. ANF/MNS composite films were prepared by vacuum-assisted filtration, and the effect of MNS content on the mechanical properties of ANF films was investigated. It gains the best mechanical properties and insulation properties when the MNS content is 0.041 wt.%. The tensile strength is 249.3MPa, the toughness is 36.7 MJ·m⁻³, and the dielectric breakdown strength is 46.2 kV·mm⁻¹. They increased by 45.1%, 197.1%, and 60.0% compared with the pure ANF films, respectively. Nanoscale MNS can form strong interfacial interaction with ANF, and the inherent strength of MNS also contributes to the improvement of the mechanical properties of nanofilms.
- Aramid nanofibers /
- Mica nanosheets /
- composite film /
- Mechanical properties /
- Insulating property.

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图 1 云母纳米片以及MNS/ANF复合薄膜的制备流程图

Figure 1. Schematic diagram of mica nanosheets and MNS/ANF composite films preparation process

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图 2 MNS、ANF和ANF/MNS的TEM形貌。(a1-a2) MNS, (b1-b2) ANF, (c1-c2) ANF/MNS

Figure 2. TEM images of (a1-a2) MNS, (b1-b2) ANF, (c1-c2) ANF/MNS water dispersions

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图 3 ANF薄膜以及不同MNS添加量MNS/ANF复合薄膜的 (a, b) FTIR, (c) XRD, (d) 紫外吸收, (e) 紫外透过谱图和 (f) 薄膜的水接触角谱图

Figure 3. (a, b) FTIR, (c) XRD (d) UV absorption, (e) UV-vis transmission, and (f) water contact angles of ANF films and MNS/ANF composite films with different MNS additions

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图 4 纯ANF薄膜以及不同MNS添加量的MNS/ANF复合薄膜的力学性能 (a) 应力-应变曲线, (b) 拉伸强度, (c) 断裂伸长率, 和 (d) 韧性图

Figure 4. (a) Stress-strain curves, (b) stress, (c) strain, and (d) toughness of ANF and ANF/MNS composite films with different MNS additions

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图 5 纯ANF薄膜以及不同MNS添加量的MNS/ANF复合薄膜断裂截面和薄膜表面的SEM图, (a₁-a₄) ANF, (b₁-b₄) ANF/MNS-I, (c₁-c₄) ANF/MNS-II, (d₁-d₄) ANF/MNS-III和(e₁-e₄) ANF/MNS-IV

Figure 5. Cross-sectional and surface SEM images of pure ANF and ANF/MNS composite films with different MNS additions. (a₁-a₄) ANF, (b₁-b₄) ANF/MNS-I, (c₁-c₄) ANF/MNS-II, (d₁-d₄) ANF/MNS-III, and (e₁-e₄) ANF/MNS-IV

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图 6 纯ANF薄膜以及不同MNS添加量的MNS/ANF复合薄膜的绝缘性能。(a)介电常数, (b)介电损耗, (c) 由威布尔分布推导出的介电击穿失效概率, (d)介电击穿强度, 和 (e) 绝缘电阻

Figure 6. Insulation properties of pure ANF films and MNS/ANF composite films with different MNS additions. (a) The dielectric constant, (b) dielectric loss, (c) the failure probability of dielectric breakdown deduced from the Weibull distribution, (d) the dielectric breakdown strength, and (e) insulation resistance

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图 7 ANF薄膜以及不同MNS添加量的ANF/MNS复合薄膜的 (a) TG以及 (b) DTG曲线

Figure 7. (a) TG and (b) DTG curves of ANF films and ANF/MNS composite films with different MNS additions

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表 1 100 mL芳纶纳米纤维 (ANF)溶液中云母纳米片 (MNSs)分散液和去离子水具体添加量

Table 1. Dosage of mica nanosheets (MNSs) dispersion and deionized water in 100 mL aramid nanofibers (ANFs) solution

Sample	MNS dispersions/μL	DI water/μL	MNS/wt.%)
ANFs	0	1000	0
ANFs/MNS-I	200	800	0.020
ANFs/MNS-II	400	600	0.041
ANFs/MNS-III	600	400	0.061
ANFs/MNS-IV	800	200	0.082

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