The Effect of Nanoclay on Morphology

The study investigates the preparation and characterization of polylactic acid (PLA) nanocompositesreinforced with modified layered nano-silicate and a compatibilizer. The nanocomposite sampleswere prepared using a melt-mixing process in a Brabender internal mixer. DSC analysis showed thatthe presence of nanoparticles increased the mobility of polymer chain segments, facilitating coldcrystallization at lower temperatures and increasing the overall crystallinity. The addition of acompatibilizer (۰.۲%) further improved the compatibility between the PLA and nanoclay, asevidenced by the decreased cold crystallization temperature and lower melting temperatures of theblends. SEM and EDS analyses were used to characterize the morphology of the nanocomposites. At(۱ wt%) nanoclay content, the particles were uniformly distributed, but higher loadings (۵ wt%) ledto particle agglomeration and the formation of rigid inclusions. The use of the compatibilizer atoptimal content (۰.۵-۰.۷ wt%) resulted in a more uniform and finer dispersion of the nanoclay withinthe PLA matrix, due to the disruption of the clay's crystalline structure and improved interfacialadhesion.

کلیدواژه ها:

Polymer Nanocomposites ، Poly Lactic Acid ، Clay Nanoparticles ، Titanium CouplingAgent ، Morphology and Mechanical Properties.