研究目的
To demonstrate the synthesis and self-assembly of ultra-high molecular weight block copolymers for the fabrication of photonic materials with structural colors and solvatochromatic properties.
研究成果
UHMW block copolymers were successfully synthesized and self-assembled into micellar photonic crystals and bulk films with structural colors. The colors are tunable by molecular weight and solvent treatment, demonstrating potential for applications in sensors and optical devices. The materials exhibit reversible solvatochromic responses.
研究不足
The study is limited to linear diblock copolymers; other architectures were not explored. The DLS setup could not accurately measure hydrodynamic diameters larger than 633 nm. Some micelle aggregation occurred during drying, affecting monodispersity. The refractive index contrast in pure polymer systems is low, which may limit optical performance.
1：Experimental Design and Method Selection:
Sequential anionic polymerization was used to synthesize UHMW PS-b-PMMA and PS-b-P2VP block copolymers. Self-assembly in selective solvents (methanol for P2VP, acetone for PMMA) was employed to form micelles and photonic crystals.
2：Sample Selection and Data Sources:
Polymers were synthesized with molar masses ranging from 923 to 4432 kg mol-
3：Characterization included SEC, 1H NMR, DSC, TEM, DLS, SEM, and UV/Vis spectroscopy. List of Experimental Equipment and Materials:
Equipment included SEC (size exclusion chromatography), NMR spectrometer (300 MHz), DSC, TEM, DLS setup (laser wavelength 633 nm), SEM, UV/Vis spectrometer. Materials included styrene, methyl methacrylate, 2-vinylpyridine, sec-butyllithium (s-BuLi), 1,1'-diphenylethylene (DPE), LiCl, THF, methanol, acetone.
4：Experimental Procedures and Operational Workflow:
Polymers were synthesized in THF at -80°C with s-BuLi initiator, endcapped with DPE, and second monomer added. Micelles were prepared by dissolving BCPs in THF and adding selective solvent dropwise. Films were cast from solution and annealed in THF vapor.
5：Data Analysis Methods:
Molecular weights and dispersity were determined by SEC vs PS standards. Composition was analyzed by 1H NMR. Particle sizes were measured by TEM and DLS. Optical properties were assessed by UV/Vis spectroscopy.
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