Improving water vapor permeability of polyurethane synthetic leather by drilling micro-hole arrays with 343 nm femtosecond laser

Guo Liang; Ren Bo; Wang Yewei; Tu Xin; Zhang Qingmao

doi:10.11884/HPLPB201830.170044

Volume 30 Issue 4

Apr. 2018

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Guo Liang, Ren Bo, Wang Yewei, et al. Improving water vapor permeability of polyurethane synthetic leather by drilling micro-hole arrays with 343 nm femtosecond laser[J]. High Power Laser and Particle Beams, 2018, 30: 049001. doi: 10.11884/HPLPB201830.170044

Citation:

Guo Liang, Ren Bo, Wang Yewei, et al. Improving water vapor permeability of polyurethane synthetic leather by drilling micro-hole arrays with 343 nm femtosecond laser[J]. High Power Laser and Particle Beams, 2018, 30: 049001. doi: 10.11884/HPLPB201830.170044

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Improving water vapor permeability of polyurethane synthetic leather by drilling micro-hole arrays with 343 nm femtosecond laser

doi: 10.11884/HPLPB201830.170044

Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices, South China Normal University, Guangzhou 510006, China

Received Date: 2017-06-27
Rev Recd Date: 2017-10-23
Publish Date: 2018-04-15

Abstract

Abstract

In this paper, 343 nm femtosecond laser and as a comparison, 1030 nm femtosecond and 1064 nm nanosecond lasers were used for improving water vapor permeability (WVP) of polyurethane (PU) synthetic leather. The morphologies of micro-hole were comparatively studied via a scanning electron microscope (SEM) and a 3D laser scanning microscope. The results indicated that 343 nm femtosecond laser was optimal to obtain excellent and small drilled micro through-holes. Moreover, analysis of interaction mechanism between laser beam and PU film revealed that the micro-drilling by 343 nm femtosecond laser exhibited photochemical ablation only, micro-drilling by 1030 nm femtosecond laser caused both photochemical and photothermal ablation, while micro-holes drilled by 1064 nm nanosecond laser resulted in photothermal ablation. By measuring the WVP and tensile resistance of the laser-drilled leather, it was concluded that the higher micro-hole density, the higher WVP value and lower tensile resistance, and the increase of pulse overlap led to an increase of WVP and a decrease of tensile resistance. The diameter of micro-hole decreased from 45 μm to 30 μm and taper of micro-hole increased from 0.7° to 12.1° with pulse overlap decreased from 91.7% to 50%. And, the highest WVP growth ratio was 306% at 2550 per sq. cm and the pulse overlap was 91.7%.
- 343 nm femtosecond laser,
- micro-hole density,
- pulse overlap,
- polyurethane synthetic leather,
- water vapor permeability,
- tensile resistance

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References(22)

References

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