研究目的
Investigating the influence of grafting polymer chains from a graphene oxide surface on the properties of the resulting PDMS-based composites, focusing on photoactuation performance.
研究成果
The study demonstrated that grafting polymer chains onto GO surfaces improves the compatibility of GO with PDMS matrices, enhances the composites' mechanical and thermal properties, and significantly improves their photoactuation performance. The best results were achieved with PBMA-grafted GO due to better flexibility and heat distribution within the composite.
研究不足
The study focuses on the modification of GO with PMMA and PBMA and their incorporation into PDMS matrices. The effects of other polymers or different modification methods on photoactuation performance were not explored.
1：Experimental Design and Method Selection
Surface initiated atom transfer radical polymerization (SI ATRP) was used for grafting polymer chains onto graphene oxide (GO) surfaces. The modification was confirmed by thermogravimetric analysis, infrared spectroscopy, and electron microscopy.
2：Sample Selection and Data Sources
Graphene oxide was prepared from graphite powder using a modified Hummers method. PDMS-based composites were prepared by incorporating polymer-grafted GO particles.
3：List of Experimental Equipment and Materials
Graphite powder, sulfuric acid, sodium nitrate, potassium permanganate, hydrogen peroxide, α-bromoisobutyryl bromide, methyl methacrylate, n-butyl methacrylate, copper bromide, PDMS Sylgard 184, among others.
4：Experimental Procedures and Operational Workflow
GO was modified via SI ATRP. Composites were prepared by mixing PDMS with modified GO, homogenized, poured into molds, and cross-linked. Characterization included TEM, FTIR, Raman spectroscopy, contact angle measurements, dielectric spectroscopy, DMA, and photoactuation performance tests.
5：Data Analysis Methods
Data were analyzed using thermogravimetric analysis, infrared spectroscopy, Raman spectroscopy, conductivity measurements, contact angle measurements, dielectric spectroscopy, dynamic mechanical analysis, and thermal conductivity measurements.
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Transmission electron microscope
JEM-2100Plus
Jeol
Used for observing the neat GO and GO with a grafted polymer layer.
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Atomic force microscope
Dimension ICON
Bruker
Used for investigating the surface topography of the samples.
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Graphite
powder, <20 μm, synthetic
Sigma Aldrich
Used as the starting material for graphene oxide preparation.
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Sulfuric acid
reagent grade, 95–98%
Sigma Aldrich
Used in the Hummers method for graphene oxide preparation.
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Sodium nitrate
ACS reagent, ≥99%
Sigma Aldrich
Used in the Hummers method for graphene oxide preparation.
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Potassium permanganate
97%
Sigma Aldrich
Used in the Hummers method for graphene oxide preparation.
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Hydrogen peroxide
ACS reagent, 29.0–32.0 wt % H2O2 basis
Sigma Aldrich
Used in the Hummers method for graphene oxide preparation.
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α-Bromoisobutyryl bromide
98%
Sigma Aldrich
Served as an initiator and was linked onto the GO surface.
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Methyl methacrylate
99%
Sigma Aldrich
Used as a monomer in the SI ATRP process.
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n-Butyl methacrylate
99%
Sigma Aldrich
Used as a monomer in the SI ATRP process.
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Copper bromide
≥99%
Sigma Aldrich
Used as a catalyst in the SI ATRP process.
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PDMS Sylgard 184
Sylgard
Used as the elastomeric matrix for the composites.
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Fourier transform infrared spectrometer
Nicolet 6700
Nicolet
Used for recording FTIR spectra of the samples.
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Raman spectrometer
Nicolet DXR
Nicolet
Used for collecting Raman spectra of the samples.
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Thermal conductivity analyzer
TCi
C-term technologies
Used for measuring the thermal conductivity of the samples.
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Dynamic mechanical analyzer
Used for studying the viscoelastic properties of the nanocomposite and pure polymer matrix.
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Thermal mechanical analyzer
Mettler Toledo
Used for investigating the photoactuation ability of the matrix and composite samples.
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