Preparation and characterization of crosslinked poly(methylmethacrylate‐acrylic acid sodium salt)‐modified bone cement

Abstract

AbstractBone cement is used as load‐distributing filler between the prosthesis and the bone as well as a method to anchor prosthesis in orthopedic implants. In this study, crosslinked poly(methylmethacrylate‐acrylic acid sodium salt), denoted as poly(MMA‐AAS‐AMA), was applied to bone cement. Allylmethacrylate (AMA) was used as a crosslinking agent. It was demonstrated by FTIR that the wavenumbers of the asymmetrical and symmetrical stretching vibrations for carboxylate anion of poly(MMA‐AAS‐AMA) were 1586 and 1407 cm−1, respectively. The poly(MMA‐AAS‐AMA)‐modified bone cement was prepared and characterized using tensile and compressive test. An excess of poly(MMA‐AAS‐AMA) in bone cement caused poor mechanical properties of the modified bone cement, because poly(MMA‐AAS‐AMA) absorbed water. In dynamic mechanical analysis, the excessive content of poly(MMA‐AAS‐AMA) lowered the stiffness of the modified bone cement, because of water existed in poly(MMA‐AAS‐AMA). The glass transition temperature of the bone cement shifted to higher temperature at higher frequency because of viscoelasticity. Based on swelling measurement, the modified bone cement was able to swell in controlled manner, and the swelling rate of the modified bone cement was improved. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010