碳纳米管协同六亚甲基四胺增韧改性酚醛树脂及其性能研究

张威; 李敏; 毕浩宇; 周钰博; 王绍凯; 李庆辉; 韩建超; 顾轶卓

碳纳米管协同六亚甲基四胺增韧改性酚醛树脂及其性能研究

北京航空航天大学　材料科学与工程学院, 北京 100191

详细信息

通讯作者:
李敏，博士，教授，博士生导师，研究方向为先进复合材料　E-mail: leemy@buaa.edu.cn

中图分类号: TB332
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- 文章访问数: 158
- HTML全文浏览量: 50
- 被引次数: 0
出版历程
- 收稿日期: 2024-01-30
- 修回日期: 2024-04-23
- 录用日期: 2024-04-27
- 网络出版日期: 2024-06-03

Studies on toughening modification and the properties of phenolic resin by carbon nanotubes in collaboration with hexamethylenetetramine

School of Materials Science and Engineering, Beihang University, Beijing 100191, China

摘要

摘要: 传统热固性酚醛树脂脆性大，本文采用六亚甲基四胺(HMTA)对酚醛树脂进行了化学增韧改性，并考察了碳纳米管协同改性提高酚醛树脂耐热性能的综合效应。研究发现，不同含量HMTA对酚醛树脂力学性能影响规律呈先增长后下降趋势，2.5wt%HMTA改性酚醛的力学性能最为突出，其压缩强度达到393 MPa，弯曲强度为149 MPa，相比未改性酚醛树脂分别提升24%与62%，断口分析表明增韧体系中形成的“海-岛”结构显著提升了树脂基体的力学性能。但是，HMTA导致酚醛树脂的耐热性能明显下降，在2.5wt%HMTA增韧酚醛体系中加入碳纳米管可将树脂体系的T_d5提升至初始酚醛树脂的水平，同时兼具优异的增韧后力学性能。这一结果对结构/防热一体化新型酚醛树脂基体的设计研制具有重要参考价值。
- 酚醛树脂 /
- 化学增韧 /
- 碳纳米管 /
- 耐热性能
Abstract: The conventional thermosetting phenolic resin exhibits significant brittleness. This paper utilized hexamethylenetetramine (HMTA) to chemically toughen phenolic resins. And the comprehensive effect of carbon nanotube synergistic modification on improving the heat-resistant properties of the phenolic resin was also examined. The results indicate that the mechanical properties of the HMTA-modified phenolic resin present a tendency of first increasing and then decreasing with the increase of the HMTA content. The highest mechanical properties are observed in the modified phenolic resin with 2.5wt% HMTA, as its compression strength reaches up to 393 MPa and the bending strength up to 149 MPa, representing increases of 24% and 62%, respectively, compared to the unmodified phenolic resin matrix. The fracture morphology reveals that the low content of HMTA creates numerous "sea-island" structures within the modified phenolic matrix, which significantly contributes to the improvement of the mechanical properties of the phenolic matrix. However, HMTA can lead to an obvious decrease in the heat-resistance of phenolic resins. Adding carbon nanotubes to the 2.5wt% HMTA toughened phenolic system can increase the T_d5 of the resin system to the level of the unmodified phenolic resin, while also exhibiting excellent toughened mechanical properties. This lays an important foundation for the design and development of new structural/thermal protection integrated phenolic resin matrices and their composites.
- phenolic resin /
- chemical toughening /
- carbon nanotubes /
- heat resistant performance

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图 1 六亚甲基四胺(HMTA)与酚醛树脂的化学反应：(a) HMTA热分解；(b) HMTA分解产物与酚醛树脂交联

Figure 1. Chemical reaction between hexamethylenetetramine (HMTA) and phenolic resin: (a) thermal decomposition of HMTA; (b) cross-linking reaction between HMTA decomposition products and phenolic resin

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图 2 实验用碳纳米管(CNTs)扫描电镜照片

Figure 2. SEM images of the utilized Carbon nanotubes (CNTs)

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图 3 不同含量HMTA改性酚醛树脂半凝胶粉末的红外光谱

Figure 3. Infrared spectra of HMTA modified phenolic resins with different contents

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图 4 添加不同含量HMTA的酚醛树脂的 (a)压缩强度与压缩模量和 (b)弯曲强度与弯曲模量的变化

Figure 4. Changes in (a) compressive strength and compressive modulus and (b) flexural strength and flexural modulus of phenolic resins added with different contents of HMTA

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图 5 各组酚醛树脂弯曲浇注体断口形貌SEM照片：(a, b)PF; (c, d)PF/2.5H; (e, f)PF/5.0H; (g, h)PF/7.0H

Figure 5. SEM images of the fracture morphology of phenolic resin bending casting matrix in each group: (a, b) PF; (c, d) PF/2.5H; (e, f) PF/5.0H;(g, h) PF/7.0H

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图 6 不同含量HMTA改性酚醛树脂基体的DMA测试结果 (a)损耗角正切；(b)玻璃化转变温度

Figure 6. DMA test results of HMTA-modified phenolic resin matrix with different contents (a) tan δ; (b) T_g

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图 7 不同含量HMTA改性酚醛树脂固化后的热重曲线

Figure 7. Thermogravimetric curves of cured phenolic resins modified with different contents of HMTA

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图 8 CNTs与HMTA协同改性酚醛树脂固化后的热重曲线

Figure 8. Thermogravimetric profiles of cured phenolic resins co-modified with CNTs and HMTA

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图 9 不同含量CNTs与2.5wt%HMTA协同改性酚醛树脂的 (a)压缩性能和(b)弯曲性能。

Figure 9. (a) compressive and (b) flexural properties of phenolic resins co-modified with different contents of CNTs and 2.5wt%HMTA

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图 10 协同改性浇注体断口形貌及其CNTs团聚区SEM照片：(a, b) PF/2.5H-0.25CNTs; (c, d) PF/2.5H-0.50CNTs; (e, f) PF/2.5H-0.75CNTs

Figure 10. SEM images of fracture morphology for co-modified casting matrix and their CNTs agglomeration area：(a, b) PF/2.5H-0.25CNTs;(c, d) PF/2.5H-0.50CNTs; (e, f) PF/2.5H-0.75CNTs

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表 1 改性酚醛树脂(PF)的样品名称与组成

Table 1. Nominations and compositions of modified phenolic resins (PF)

Nominations	PF/g	HMTA/g	CNTs/g
PF	100	0	0
PF/2.5H	97.5	2.5	0
PF/5.0H	95.0	5.0	0
PF/7.0H	93.0	7.0	0
PF/2.5H-0.25CNTs	97.5	2.5	0.25
PF/2.5H-0.50CNTs	97.5	2.5	0.50
PF/2.5H-0.75CNTs	97.5	2.5	0.75

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表 2 不同含量HMTA改性酚醛树脂固化后的热性能参数

Table 2. Thermogravimetric analysis data of cured phenolic resins modified with different contents of HMTA

Designation	T_d5/℃	T_d10/℃	Residue at 800℃/%
PF	362	446	63.8
PF/2.5H	329	430	61.6
PF/5.0H	324	425	60.3
PF/7.0H	304	417	59.5
Notes：T_d5 is the pyrolysis temperature at 5% mass loss; T_d10 is the pyrolysis temperature at 10% mass loss.

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表 3 CNTs与HMTA协同改性酚醛树脂固化后的热性能参数

Table 3. Thermogravimetric analysis data of cured phenolic resins co-modified with CNTs and HMTA

Designation	T_d5/℃	T_d10/℃	Residue at 800℃/%
PF	362	446	63.8
PF/2.5H	329	430	61.6
PF/2.5H-0.25CNTs	380	444	61.8
PF/2.5H-0.50CNTs	392	446	62.5
PF/2.5H-0.75CNTs	394	449	62.9

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