研究目的
To investigate the structural characterization and thermal degradation of poly(methylmethacrylate)/zinc oxide nanocomposites, focusing on the effect of ZnO nanoparticles on thermal stability and degradation kinetics.
研究成果
The PMMA/ZnO nanocomposites exhibit enhanced thermal stability compared to pure PMMA, with ZnO nanoparticles inhibiting early degradation stages but promoting later random chain scission. The overall stability is due to the dominant inhibiting effect. The materials also show good UV shielding and optical transparency, with potential hydrogen bonding at the interface. Future work could focus on optimizing dispersion and exploring other solvents or surface modifications.
研究不足
The study notes that ZnO nanoparticles tend to agglomerate at high concentrations (e.g., 15 wt%), which could be improved by surface modification. The kinetic model assumes specific reactions and may not capture all complexities of degradation mechanisms. The research is limited to chloroform as the solvent and specific synthesis conditions, which may affect generalizability.
1：Experimental Design and Method Selection:
The study used a solution casting method to prepare PMMA/ZnO nanocomposites. ZnO nanoparticles were synthesized via chemical precipitation, and nanocomposites were prepared by dispersing ZnO in chloroform and mixing with PMMA solution, followed by casting and drying. Characterization techniques included XRD, SEM, UV-vis, FTIR, and TGA to analyze structure and thermal properties. A kinetic model (Ferriol model) was applied for degradation analysis.
2：Sample Selection and Data Sources:
Samples included pure PMMA and PMMA/ZnO nanocomposites with ZnO contents of 1, 2, 4, 5, 10, and 15 wt%. Materials were sourced from Sigma-Aldrich and a local plastics company (ENPC).
3：List of Experimental Equipment and Materials:
Equipment: Bruker D8 Advance diffractometer (XRD), Perkin-Elmer spectrometer (FTIR), Perkin Elmer spectrometer (UV-vis), Mettler Toledo 822e instrument (TGA), Hitachi SU8000 SEM. Materials: Zinc acetate dihydrate, methanol, NaOH, chloroform, PMMA (LG PMMA EG920).
4：0).
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: ZnO synthesis involved mixing zinc acetate and methanol, adding NaOH to form precipitate, filtering, drying, and calcining. Nanocomposite preparation involved dispersing ZnO in chloroform, adding to PMMA solution, stirring, casting on glass plates, air drying, and vacuum oven drying. Characterization was performed as per standard protocols for each technique.
5：Data Analysis Methods:
XRD data analyzed using Debye-Scherrer formula for particle size. TGA data analyzed using Ferriol model for kinetic parameters (activation energy, pre-exponential factor, reaction order, yield coefficient) via peak fitting methodology.
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