Related Experiment Video
Updated: Jul 6, 2025
11:38
Environmentally-controlled Microtensile Testing of Mechanically-adaptive Polymer Nanocomposites for ex vivo Characterization
Published on: August 20, 2013
10.2K
Reactive processing-microstructure-mechanical performance correlations in biodegradable poly(lactic acid)/expanded
Mahdi Rahmanifard1, Seyed Mohammad Hassan Khademi1, Reza Asheghi-Oskooee1
1Caspian Faculty of Engineering, College of Engineering, University of Tehran P.O. Box 43841-119 Guilan Iran tara.farizeh@ut.ac.ir f.hemmati@ut.ac.ir.
RSC Advances
|January 4, 2024
Summary
Biodegradable nanocomposites of poly(lactic acid) (PLA) and expanded graphite (EG) were created. Larger EG platelets significantly improved mechanical properties, while smaller ones had minimal impact.
Area of Science:
- Materials Science
- Polymer Science
- Nanotechnology
Background:
- Biodegradable nanocomposites offer sustainable alternatives to conventional plastics.
- Reactive extrusion is an effective method for creating polymer nanocomposites.
- Poly(lactic acid) (PLA) is a widely used biodegradable polymer.
Purpose of the Study:
- To investigate the effects of expanded graphite (EG) characteristics on the properties of poly(lactic acid) (PLA) nanocomposites.
- To explore the role of EG loading, aspect ratio, and dispersion in enhancing mechanical and thermo-mechanical properties.
- To understand the influence of EG on PLA molecular dynamics and crystallization.
Main Methods:
- Preparation of PLA/EG nanocomposites using reactive extrusion and melt-compounding.
- Characterization of mechanical properties (Young modulus, tensile strength, strain, toughness, impact strength).
- Analysis of thermo-mechanical properties and molecular dynamics influenced by EG.
Main Results:
- The largest EG (EGL) nanoplatelets significantly enhanced Young modulus, tensile strength, ultimate strain, and tensile toughness (40-100%).
- Smaller EG (EGS) lowered relaxation time and accelerated crystallization, showing the weakest reinforcement.
- Intermediate EG (EGM) showed negligible effect on molecular dynamics but reduced crystallization rate, yielding the highest impact strength at 1 phr.
Conclusions:
- EG characteristics, particularly size and aspect ratio, critically influence PLA nanocomposite properties.
- Optimized EG (EGL) can substantially improve mechanical performance through restricted molecular motion and chain extension.
- Specific EG types (EGM) can enhance impact strength, demonstrating tailored property enhancement possibilities.
