Morphological and Water Absorption Properties of Bio-Based Polyesters/MWCNT Nanocomposites

This manuscript investigates the effect of MWCNT addition on the morphological and water absorption properties of bio-based polyester nanocomposites made from PLA and PBS. The nanocomposites were produced by the melt-mixing method using a twin-screw extruder. An analysis of the percentage by mass of water absorbed was used to determine the absorption properties of polyesters. The addition of MWCNTs to the polyester matrix is a big challenge because agglomerated MWCNTs can introduce micro-voids and defects that act as a channel for water permeation. The SEM images show that the polyester fracture surface becomes rough with several voids after the addition of MWCNTs. The water absorption properties of bio-based polyesters such as PBS show significant changes (an increase of 185%) compared to pure PBS. These findings reveal that the addition of MWCNTs in a small amount (1 wt%) affects the morphology and water absorption capacity of bio-based polyesters.