| DENG Ya-ling,LI Yu-wen-cheng,XU Yu,YU Bo,TANG Qing-xin,GAO Chen-hong,WANG Yu-xin.Research Advance in Application of Surface Grafting Modification of Polyethylene[J],52(9):108-124 |
| Research Advance in Application of Surface Grafting Modification of Polyethylene |
| Received:June 07, 2022 Revised:November 09, 2022 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2023.09.008 |
| KeyWord:polyethylene grafting surface modification UV irradiation plasma grafting γ ray irradiation grafting |
| Author | Institution |
| DENG Ya-ling |
College of Intelligent Science and Control Engineering, Jinling Institute of Technology, Nanjing , China |
| LI Yu-wen-cheng |
College of Intelligent Science and Control Engineering, Jinling Institute of Technology, Nanjing , China |
| XU Yu |
College of Intelligent Science and Control Engineering, Jinling Institute of Technology, Nanjing , China |
| YU Bo |
College of Science, Nanjing Forestry University, Nanjing , China |
| TANG Qing-xin |
College of Intelligent Science and Control Engineering, Jinling Institute of Technology, Nanjing , China |
| GAO Chen-hong |
College of Intelligent Science and Control Engineering, Jinling Institute of Technology, Nanjing , China |
| WANG Yu-xin |
College of Intelligent Science and Control Engineering, Jinling Institute of Technology, Nanjing , China |
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| Abstract: |
| As a polymer formed from ethylene (C2H4), polyethylene is a common thermoplastic engineering material, which has been widely utilized in various fields due to its outstanding physical-chemical and processing properties. However, the polyethylene molecular chain consisting of many ethylene repeat units has a unique linear molecular structure. The characteristics of low surface energy, low wettability, and weak bonding limit the extension of its application. For example, surface hydrophobicity makes it vulnerable to microbial attack. Non-polar characteristics cause the accumulation of water droplets on the surface of the polyethylene greenhouse film, which severely limits the transmittance. Surface grafting technology could introduce the functional groups onto the surface of polyethylene and improve its properties. In this paper, the grafting techniques for polyethylene and the grafting mechanisms were introduced, including UV irradiation grafting, electron beam irradiation grafting, plasma surface grafting, γ ray irradiation grafting, and reversible deactivation radical polymerization. Then, the properties and application of modified polyethylene were introduced and summarized. In terms of prosthesis implantation and its tribological properties, the lubrication mechanism of polyethylene surface grafted polymer brush was explained. The surface grafted polymer brush was similar to the brush structure on the superficial surface of natural articular cartilage, consisting of hyaluronic acid, proteoglycans, and lubricin. For the implant prosthesis with complex geometry, the differences between the grafted polymer layer prepared by UV light irradiation and thermal grafting were compared and analyzed. The thermal grafting method could effectively solve the problem of the non-uniform thickness of graft polymer lubrication layer on complex shape surfaces, which were suitable for mass production. When it came to biocompatibility, the effects of graft modification on polyethylene surface polarity were introduced, and the differences between different grafted polymer molecules in antibacterial fixation were analyzed. The grafted acid polymer molecules could exert a more bactericidal and bacteriostatic effect. In the application field of impact resistance, the failure reason for the impact resistance of polyethylene fiber was analyzed, and the impact resistance mechanism of modified fiber was expounded. Surface-grafted polymer molecules on polyethylene fiber improved the surface roughness, which provided mechanical interlocking sites. This method enhanced mechanical locking strength and interfacial shear strength. In terms of ionic conductivity, the mechanism of grafting modified polyethylene to enhance ionic conductivity, and the relationships between the mobility degree of proton groups and hydration degree, were explained and analyzed. The influence mechanism of the two factors on ionic conductivity was discussed. The grafting rate could be mediated by adjusting the LDPE film thickness, irradiation dose, monomer concentration, and other parameters, which could control the ion exchange capacity. As an agricultural greenhouse film, the anti-fogging mechanism of modified polyethylene shed film was analyzed. By improving the wettability of the shed film, the migration rate of water molecules was accelerated, and the droplet properties of the attached liquid on the shed film surface were prolonged. Surface coating and internal blending were two effective preparation methods for shed films. The application of graft-modified polyethylene in water purification, antibacterial cushion, and other fields was also introduced. Finally, the problems of modified polyethylene in the investigation were pointed out, and the application prospect was also discussed. |
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