Dynamic Mechanical Properties of PDLLA/PCL Blends and their Nanocomposites with Bioactive Glass as Nanofiller

Abstract In this paper, the effect of blending and the addition of small amount of bioactive glass nanoparticles (BGn) on the dynamic mechanical behavior were investigated. While the storage modulus of neat PDLLA was decreased from 1.73 GPa to 0.77 GPa with addition of PCL phases, the storage modulus of PDLLA/PCL blends was increased from 1.062 GPa up to 1.66 Gpa with the addition of BGn from 1 wt% to 6 wt%. The intensities of the glass transition peak for PDLLA in the blends decreased 2.78 to 1.84 with the addition of elastomeric PCL phase up to 30 wt%. This is probably because PCL anyway shows extremely low damping as result of its fairly high chain mobility. The intensities of the glass transition peak for PDLLA/PCL blends increases with addition of BGn as nanofiller which were expected because of changes in the polymer chain mobility. The glass transition obtained from E" and tan ? curves indicated that Tg of the PDLLA with addition of BGn in the nanocomposites as well as addition of PCL in the blends was diminished.