Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 03, 2023 - September 06, 2023
The composite of tricalcium phosphate (TCP) and poly(lactic acid) (PLA) was attracted attention as a material of bone fixation device that is bioabsorbable and can decrease burden for patients. However, the mechanical properties of TCP/PLA composite are not sufficient for application as a bone fixation device. Therefore, the interface treatment between TCP and PLA has been investigated to improve the mechanical properties. In order to reduce the molding cost in the interface treatment, this study aims to reduce the amount of solvent used in the interface treatment. Changes in the weight of ethanol used as solvent during the interfacial treatment were measured. As a result, the weight of ethanol in the mixture decreased with interfacial treatment time and ethanol was almost volatilized after about 75 minutes. And, effect of the amount of stearic acid on molding and mechanical properties of TCP/PLA composite was investigated as a basic study. The viscosity of melted TCP/PLA composites interface treated with stearic acid was investigated by melt flow rate (MFR). The results showed that compositing with TCP and interface treatment reduced the melt viscosity during molding. The tensile strength of the TCP/PLA composite with 24 phc was slightly higther than that of 0 phc and 6 phc. On the other hand, the elastic modulus increased at 6 phc, and decreased at 24 phc. This increase in tensile strength and modulus might be due to the increased interfacial strength between TCP and PLA resulting from the interface treatment.
