The Development of Biodegradable Polylactic Acid Nanocomposite Materials Utilized in Engineering Plastic
Date Issued
2012
Date
2012
Author(s)
Chou, Hung-Chia
Abstract
This study of polymer nanocomposites was focused on the discussion of feasibility that PLA based plastics that can be used on automobile or furniture. This experimental research have been set on the discussion of crystallinity, mechanical and thermal properties of thermoplastic polyurethane (TPU) toughened PLA/ montmorillonite (MMT) nanocomposites, and the goal of this research is to improve their applicability and sustainability to reach the requirements of application on commercial products without much sacrifice in their biodegradability. The tensile test and flexural test showed that PLA blending with TPU in 10 wt %, talc in 4 wt%, and OMC in 2 wt% owes the highest modulus and strength without much sacrifice for elongation while the result form impact test show that the specimen of similar formula without OMC displays the highest impact resistance of 33.07 J/m. The hardness test showed similar tendency with the results of elastic modulus. The heat distortion temperature (HDT) tests showed that the specimens without annealing would not much alter their HDT even adding inorganic fillers while the specimens with thermal treatment would dramatically raise the HDT, which may come from the increase of crystallinity after thermal treatment. The observation under electron microscope demonstrated that the incorporation of inorganic fillers would dramatically alter the heterogeneous morphology of PLA/TPU blending. On the other hand, the incorporation of glass fiber in these nanocomposites showed the significant enhancement of mechanical strength with no interference on their thermal behaviors. In the conclusion, this research provides a possible route to prepare biodegradable engineering plastics in traditional method.
Subjects
Polylactide (PLA)
Thermoplastic polyurethane (TPU)
Montmorillonite (MMT)
Nanocomposites
Glass fiber
Engineering plastics
Biodegradable plastics
Type
thesis
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