期刊
POLYMERS
卷 14, 期 16, 页码 -出版社
MDPI
DOI: 10.3390/polym14163257
关键词
polyethylene terephthalate film; stress-optical properties; stress-induced birefringence; anisotropy; photoelasticity; flexible electronics
资金
- National Natural Science Foundation of China [12125203, 12021002, 11827802]
This study used the photoelastic method to investigate the stress-optical properties of PET films. A self-built bidirectional photoelasticity measurement system was developed and used to measure the stress-optical coefficients and isoclinic angles of PET films with different stretching angles. The linear combinations of the photoelastic tensor components and refractive-index-related parameters were determined by fitting the analytical relationship between the stress-optical coefficients and isoclinic angles.
Polyethylene terephthalate (PET) is one of the most commonly used substrate materials in the field of flexible electronics, and its stress-induced birefringence often has a detrimental effect on the optical properties of the device. Therefore, a deep and systematic understanding of the stress-optical properties of PET films is crucial for device design and manufacture. The photoelastic method is a direct optical measurement technique based on the stress-induced birefringence effect of materials, which has the advantages of being nondestructive and noncontact. In this work, the photoelastic method was used to quantitatively characterize the anisotropy of the stress-optical properties of PET films under the uniaxial stress state. First, a self-built reflection-transmission coaxial bidirectional photoelasticity measurement system was developed by means of a combination of transmission and reflection photoelasticity. Then, the stress-optical coefficients and isoclinic angles of PET films with different stretching angles were measured. Finally, the linear combinations of the photoelastic tensor components and refractive-index-related parameters were determined by fitting the analytical relationship between the stress-optical coefficients and isoclinic angles.
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