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Materials 2018, 11(1), 29; https://doi.org/10.3390/ma11010029

Enhancement of the Laser Transmission Weldability between Polyethylene and Polyoxymethylene by Plasma Surface Treatment

1
School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China
2
Changzhou Key Laboratory of Large Plastic Parts Intelligence Manufacturing, Changzhou College of Information Technology, Changzhou 213164, China
*
Author to whom correspondence should be addressed.
Received: 1 December 2017 / Revised: 20 December 2017 / Accepted: 22 December 2017 / Published: 26 December 2017
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Abstract

Due to their large compatibility difference, polyethylene (PE) and polyoxymethylene (POM) cannot be welded together by laser transmission welding. In this study, PE and POM are pretreated using plasma that significantly enhances their laser transmission welding strength. To understand the mechanism underlying the laser welding strength enhancement, surface modification is analyzed using contact angle measurements, atomic force microscopy (AFM), optical microscopy, and X-ray photoelectron spectroscopy (XPS). Characterization results show that the plasma surface treatment improves the surface free energy, significantly enhancing the wettability of the materials. The increase in surface roughness and the generation of homogeneous bubbles contribute to the formation of mechanical micro-interlocking. The oxygen-containing groups introduced by the oxygen plasma treatment improve the compatibility of PE and POM, and facilitate the diffusion and entanglement of molecular chains and the formation of van der Waals force. View Full-Text
Keywords: laser transmission welding; plasma surface treatment; surface modification; polyethylene; polyoxymethylene laser transmission welding; plasma surface treatment; surface modification; polyethylene; polyoxymethylene
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Liu, H.; Jiang, Y.; Tan, W.; Wang, X. Enhancement of the Laser Transmission Weldability between Polyethylene and Polyoxymethylene by Plasma Surface Treatment. Materials 2018, 11, 29.

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