Melting and Crystallization Behaviors of Poly(Lactic Acid) Modified with Graphene Acting as a Nucleating Agent
| Autor: | Dan Wang, Jibin Miao, Jing-Wang Liu, Bin Yang, Fang Chen, Ru Xia, Lifen Su, Peng Chen, Jiasheng Qian |
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| Rok vydání: | 2019 |
| Předmět: |
Nanocomposite
Materials science Polymers and Plastics Graphene Nucleation 02 engineering and technology General Chemistry Carbon nanotube 021001 nanoscience & nanotechnology Condensed Matter Physics law.invention chemistry.chemical_compound Crystallinity Differential scanning calorimetry 020401 chemical engineering Polylactic acid chemistry Chemical engineering law Materials Chemistry 0204 chemical engineering Crystallization 0210 nano-technology |
| Zdroj: | Journal of Macromolecular Science, Part B. 58:290-304 |
| ISSN: | 1525-609X 0022-2348 |
| Popis: | 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 (ϕ ≤ 10 °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... |
| Databáze: | OpenAIRE |
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