Abstract:On account of the large polarity and compatibility difference among different kinds of polymers, it is difficult to connect them directly by laser transmission joining. The maleic anhydride grafted polyethylene was carried out in this paper, which could improve the performance of the laser transmission joining between polyethylene and polyoxymethylene. Firstly, the formulation and process of grafting modification of polyethylene were introduced, and the thermodynamic properties of the polyethylene before and after modification were analyzed. Then the laser transmission joining experiments were carried out. The experimental results show that the graft-modified polyethylene is successfully welded with polyoxymethylene, which has a high joining strength of 6.7 MPa. The influence of process parameters on the joining strength was analyzed. With the increase of laser power and scanning speed, the joining strength increases first and then decreases. Finally, the study of laser transmission joining mechanization between polyethylene and polyoxymethylene was carried out. It is pointed out that the improvement of compatibility and the surface free energy resulting from the grafting modification, the micro anchor effect of homogeneous bubbles generated in the welding process are the main reasons for improvement of the joining strength of modified polyethylene and polyoxymethylene.