Mechanical properties and repair efficiency of self⁃repairing microencapsulated epoxy resin

doi:10.19491/j.issn.1001-9278.2024.05.008

Abstract

Abstract:

To investigate the effect of the introduction of self⁃healing epoxy microcapsules on the mechanical properties and repairability of resin⁃based composite materials， a repair system consisting of in⁃situ polymerized epoxy microcapsules and phthalic anhydride as a latent curing agent was incorporated into the mixture of E51⁃type epoxy resin and modified polyetheramine curing agent， resulting in the formation of self⁃healing epoxy resin⁃based composite materials. The shear viscosity of the mixing system was analyzed， and the mechanical and repairing performance of the composite materials were investigated. The results indicated that the increase of the content of self⁃healing components resulted in a decrease in the mechanical properties of the composite materials but an increase in their healing efficiency. However， the tensile strength of the repaired composite materials did not show a linear increment. Through comprehensive analysis on the experimental results， the optimal choice was determined to be a self⁃healing component ratio of 3/2 and a microcapsule content of 8 wt% for the composite materials. Under these conditions， the resultant composite material exhibited tensile strength of 15.32 MPa and post⁃repair tensile strength of 10.13 MPa， presenting a healing efficiency of 66.12 %.

Key words: self?healing microcapsule, epoxy resin matrix composite, mechanical property, repair efficiency

CLC Number:

TQ323.5

WANG Han, LIANG Jinhua, GAO Zhenguo, JIANG Wei, ZHOU Hao. Mechanical properties and repair efficiency of self⁃repairing microencapsulated epoxy resin[J]. China Plastics, 2024, 38(5): 40-46.

Figures/Tables 14

Fig.1. Self⁃healing epoxy resin composite tensile specimen

Fig.2. Tensile testing machine

Fig.3. SEM images of MUF⁃coated E51 epoxy microcapsules

Fig.4. FTIR spectra of the MUF⁃coated E51 epoxy resin microcapsules

Fig.5. Viscosity variation curve of the epoxy resin⁃based composite materials with different self⁃repairing component contents when the mass ratio of self⁃repairing component was 2/1

Fig.6. Viscosity variation curve of the epoxy resin⁃based composite materials with different self⁃repairing component contents when the mass ratio of self⁃repairing component was 3/2

自修复组分配比	自修复组分含量/%
自修复组分配比	6	8	10
2/1	6.8	9.1	15.9
3/2	7.5	12.8	21.4

Tab.1. Average viscosity of the samples

试验编号	自修复组分含量/%	微胶囊与固化剂配比	抗拉强度/ MPa	弹性模量/ MPa
1^#	6	2/1	23.09	572.52
2^#	8	2/1	17.68	424.94
3^#	10	2/1	10.36	290.21
5^#	6	3/2	22.74	584.23
6^#	8	3/2	15.32	365.74
7^#	10	3/2	10.28	207.70
8^#	0	—	27.97	721.16

Tab.2. Tensile properties of the composite materials

Fig.7. Tensile curve of the epoxy resin⁃based composite materials with different self⁃repairing component contents when the mass ratio of self⁃repairing component was 2/1

Fig.8. Tensile curve of the epoxy resin⁃based composite materials with different self⁃repairing component contents when the mass ratio of self⁃repairing component was 3/2

Fig.9. OM images of the samples

Fig.10. SEM images of the sample repair parts

试验编号	自修复组分含量/%	微胶囊与固化剂配比	原始拉伸强度/MPa	修复后拉伸强度/MPa	修复效率/%
1^#	6	2/1	23.09	4.34	18.80
2^#	8	2/1	17.68	4.95	28.00
3^#	10	2/1	10.36	6.01	58.11
4^#	6	3/2	22.74	5.98	26.30
5^#	8	3/2	15.32	10.13	66.12
6^#	10	3/2	10.28	8.06	78.40

Tab.3. Repair performance of the composite materials

Fig.11. Repair efficiency of the composite materials

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