title: The mechanical properties of the ultra high molecular weight polyethylene grafted with 3-dimethy (3-(N-methacryamido) propyl) ammonium propane sulfonate.
abstract: Ultra-high molecular weight polyethylene (UHMWPE) powder was modified with a zwitterion monomer with good biocompatibility of MPDSAH (3-dimethy (3-(N-methacryamido) propyl) ammonium propane sulfonate) by UV irradiation and then hot pressed. The microstructure and mechanical properties of modified UHMWPE are investigated. The results show that the structure of powder and bulk materials has been changed. The modified powders have more filaments than that of untreated. The surface of modified bulk materials is more rough and displays the granular protuberances which have the random loose arrangement compared with untreated UHMWPE. The crystallinity, uniaxial tensile and compressive properties decreased after grafting. Ultimate elongations decrease with the increase of the monomer concentration and are higher than 300% which is recommended by ASTM and ISO except the sample with 0.45mol/L MPDSAH. The friction coefficient of modified UHMWPE is lower than that of the untreated UHMWPE and it decreases gradually with the increase of monomer concentration. The wear rates have been decreased and the wear resistance has been improved under saline and distilled water lubrication.
authors.affiliation: School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu 210094, PR China.
authors.forename: Yaling
authors.initials: Y
authors.lastname: Deng
authors.affiliation: School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu 210094, PR China. Electronic address: xiongds@163.com.
authors.forename: Dangsheng
authors.initials: D
authors.lastname: Xiong
authors.affiliation: School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu 210094, PR China.
authors.forename: Kun
authors.initials: K
authors.lastname: Wang
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry; D002152:Calorimetry, Differential Scanning; D019245:Compressive Strength; D003460:Crystallization; D017276:Friction; D007720:Knee Prosthesis; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D008970:Molecular Weight; D011095:Polyethylenes / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry; D011474:Prosthesis Design / Q000379:methods*; D000644:Quaternary Ammonium Compounds / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties; D013696:Temperature; D013718:Tensile Strength; D014466:Ultraviolet Rays
chemical_list: D001672:Biocompatible Materials; D008689:Methacrylates; D011095:Polyethylenes; D011108:Polymers; D000644:Quaternary Ammonium Compounds; C111601:ultra-high molecular weight polyethylene
keywords: Artificial joint; Compressive; Tensile; UHMWPE; Wear