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Materials 2015, 8(8), 4961-4977; doi:10.3390/ma8084961

Study on Welding Mechanism Based on Modification of Polypropylene for Improving the Laser Transmission Weldability to PA66

1
School of Mechanical Engineering, Jiangsu University, Xuefu Road, Zhenjiang 212013, China
2
School of Mechanical and Electrical Engineering, Zhenjiang Vocational Technical College, Xuefu Road, Zhenjiang 212013, China
*
Author to whom correspondence should be addressed.
Academic Editor: Wen-Hsiang Hsieh
Received: 25 May 2015 / Accepted: 30 July 2015 / Published: 4 August 2015
(This article belongs to the Special Issue Selected Papers from ICETI2014)
View Full-Text   |   Download PDF [2402 KB, uploaded 4 August 2015]   |  

Abstract

Polypropylene and PA66 are widely used in our daily life, but they cannot be welded by laser transmission welding (LTW) because of polar differences and poor compatibility. In this paper, grafting modification technology is used to improve the welding performance between polypropylene and PA66. Firstly, the strong reactive and polar maleic-anhydride (MAH) is grafted to polypropylene and infrared spectrometer is used to prove that MAH has been grafted to polypropylene. At the same time, the mechanical and thermal properties of the graft modified polypropylene (TGMPP) are tested. The results prove that the grafting modification has little influence on them. Also, the optical properties of TGMPP are measured. Then, the high welding strength between TGMPP and PA66 is found and the mechanism of the weldability is researched, which shows that there are two reasons for the high welding strength. By observing the micro morphology of the welding zone, one reason found is that the modification of polypropylene can improve the compatibility between polypropylene and PA66 and make them easy to diffuse mutually, which causes many locking structures formed in the welding region. The other reason is that there are chemical reactions between TGMPP and PA66 proved by the X-ray photoelectron spectrometer. View Full-Text
Keywords: laser transmission welding (LTW); the graft modified polypropylene (TGMPP); PA66; maleic anhydride (MAH) laser transmission welding (LTW); the graft modified polypropylene (TGMPP); PA66; maleic anhydride (MAH)
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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MDPI and ACS Style

Liu, H.; Jiang, H.; Guo, D.; Chen, G.; Yan, Z.; Li, P.; Zhu, H.; Chen, J.; Wang, X. Study on Welding Mechanism Based on Modification of Polypropylene for Improving the Laser Transmission Weldability to PA66. Materials 2015, 8, 4961-4977.

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