Determination of elastic modulus by atomic force microscopy and microstructure analysis for polyurethane coating film

被引：0

作者：

Xie C. ^{[1
]}

Wang Q.-C. ^{[1
,2
]}

Yu B.-T. ^{[1
]}

Li S. ^{[1
,2
]}

Lin X.-X. ^{[1
]}

Lu Z.-M. ^{[3
]}

机构：

[1] College of Civil Engineering, Lanzhou Jiaotong University, Lanzhou

[2] National and Local Joint Engineering Laboratory for Disaster Prevention and Control Technology of Road and Bridge Engineering, Lanzhou Jiaotong University, Lanzhou

[3] Gansu Seventh Construction Group Co.，Ltd., Gansu, Lanzhou

来源：

Jilin Daxue Xuebao (Gongxueban)/Journal of Jilin University (Engineering and Technology Edition) | 2023年 / 53卷 / 05期

关键词：

atomic force microscopy; elastic modulus; free volume; grey relational degree; microstructure;

D O I：

10.13229/j.cnki.jdxbgxb.20210918

中图分类号：

学科分类号：

摘要：

In this work，the mechanical contact model between normal triangular atomic force microscopy （AFM）probe and coating film was established，which aims to measure the elastic modulus of polyurethane coating film. Whilst the force-indentation depth relationship between the probe and the coating film was obtained by analyzing the AFM's mechanical test curve，and the elastic modulus of the coating film was determined by combining the newly established model. In addition，the microstructure of the coating film was tested using positron-annihilation technology，and compared with its elastic modulus. Finally，the grey correlation theory is used to analyze the correlation between the microstructure parameters and the elastic modulus of the coating film. The results show that the elastic modulus of the coating film was measured within the region of 6.118 MPa to 6.917 MPa. This is consistent with the research results of the elastic modulus of polyurethane coating in existing literature，which guarantees the validity and accuracy of the present method. The elastic modulus of the coating film is negatively correlated with its free volume aperture and free volume fraction since that the restriction ability of the substrate to its molecular chain segment movement is significantly lowered with the increase of free volume size and content. Among them，the free volume average pore diameter of the coating film has higher effects on its elastic modulus. © 2023 Editorial Board of Jilin University. All rights reserved.

引用

页码：1322 / 1330

页数：8

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