Journal
JOURNAL OF MACROMOLECULAR SCIENCE PART B-PHYSICS
Volume 58, Issue 2, Pages 290-304Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/00222348.2018.1564222
Keywords
Crystallization kinetics; graphene; nucleating agent; poly(lactic acid); cooling rate
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Funding
- National Natural Science Foundation of China [51203002, 51273001]
- 211 Project of Anhui University
- Collaborative Innovation Center for Petrochemical New Materials
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Graphene (GN)-filled polylactic acid (PLA) nanocomposites were prepared through a solution blending method with GN weight percent ranging from 0.5 to 2 wt%. Rheological, melting and crystallization behaviors of the prepared PLA/GN nanocomposites were investigated by means of dynamic rheological measurements and differential scanning calorimetry (DSC). The shear viscosities of the PLA/GN nanocomposites decreased with increasing GN content, which was remarkably different from previous reports on the modifications using traditional nanofillers (e.g., clay, carbon nanotubes, etc.). The nonisothermal melt crystallization kinetic analysis suggested that GN served as a nucleating agent and could considerably promote the PLA's crystallization through heterogeneous nucleation. Our findings suggested that at relatively low cooling rates (phi <= 10 degrees C/min) even a small amount of GN promoted the nucleation and considerably increased the crystallization rate. However, the crystallinity began to decrease at higher cooling rates (e.g., phi >= 20 degrees C/min), especially when the GN content was high (e.g., 2 wt%), possibly owing to the GN aggregation effect considering PLA is a slowly crystallizing polymer.
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