Effects of physical aging on thermomechanical behaviors of poly(ethylene terephthalate)-glycol (PETG)

ABSTRACT

A series of experiments are performed to investigate the effects of physical aging on thermomechanical properties of poly(ethylene terephthalate)-glycol (PETG). The DMA, DSC and XRD tests are used to characterize the change of dynamic property, heat capacity and microstructure with annealing treatments. The uniaxial tension tests together with the DIC technique are employed to describe the failure behaviors of PETG. The results show that the annealed polymers exhibit a larger maximum local strain and fail at a smaller displacement. The type and size of the geometry defects can also affect the strain localization and final failure behaviors of PETG.

Graphical Abstract

KEYWORDS:

• PETG
• physical aging
• DIC
• DSC
• XRD

Acknowledgments

The authors acknowledge the Fundamental Research Funds for Central Universities, Hohai University (Grant No. 2019B85814), the project (No: 19HNKLE01) supported the Hunan Province Key Laboratory of Engineering Rheology, Central South University of Forestry and Technology.

Supplementary material

Supplemental data for this article can be accessed here.

Additional information

Funding

This work was supported by the Hunan Province Key Laboratory of Engineering Rheology [19HNKLE01];Fundamental Research Funds for Central Universities [2019B85814].

Notes on contributors

Qinpeng Shi

Qinpeng Shi is a master student in Department of Engineering Mechanics at Hohai University.

Rui Xiao

Dr. Rui Xiao is a professor in Department of Engineering Mechanics at Zhejiang University. He obtained the Ph.D degree from Department of Mechanical Engineering at Johns Hopkins University in 2015. After graduation, he worked as an associate professor in Department of Engineering Mechanics at Hohai University before joining Zhejiang University in April 2019.

Huxiao Yang

Huxiao Yang is a master student in Department of Engineering Mechanics at Hohai University.

Dong Lei

Dr. Dong Lei is is a professor in Department of Engineering Mechanics at Hohai University. He obtained the Ph.D degree from Department of Modern Mechanics at University of Science and Technology of China in 2006. He joined in Hohai University in 2009.