Evaluation of the flexural properties and bioactivity of bioresorbable PLLA/PBSL/CNT and PLLA/PBSL/TiO_2 nanocomposites

摘要

Bioresorbable nanocomposites made from PLLA/PBSL blended with varying contents of carbon nanotubes (CNTs) and titanium dioxide (TiO_2) nanotubes were prepared through melt compounding followed by compression molding. The resulting flexural properties were investigated by flexural test and the bioac tive behavior was assessed by FESEM and EDX. A higher flexural modulus value was obtained with the addition of nanofillers. The formation of a bone-like apatite layer was observed on the surface of the nanocomposite containing TiO_2 nanotubes after soaking in simulated body fluid (SBF) for 7 days. An increase in the water uptake of the PLLA/PBSL/TiO_2 nanocomposite occurred with increased filler loading. The nanocomposite containing CNT exhibited an increasing trend of water absorption similar to the PLLA/PBSL blend. With prolonged immersion in SBF, the pH value of the SBF reduced slightly and weight loss of the samples increased.