研究目的
To fabricate and demonstrate thermally reversible light scattering (TRLS) materials based solely on benzoxazine-urethane (BA-a/PU) alloys, exploring their optical state transitions, thermal stability, and the mechanisms behind their TRLS properties.
研究成果
Benzoxazine-urethane alloys exhibiting thermally reversible light scattering properties were successfully fabricated. The alloys showed good optical contrasts and were form-stable up to 250°C. The reaction-induced phase separation, sizes and local concentrations of urethane microdomains, and reversible dissolution and demixing played crucial roles in the TRLS properties. These materials are suitable for opto-thermal sensing applications at high temperatures.
研究不足
The study focuses on the optical and thermal properties of BA-a/PU alloys, with limited exploration of mechanical properties. The mechanisms behind the TRLS properties are proposed based on experimental observations but may require further validation.
1：Experimental Design and Method Selection:
The study involved the fabrication of BA-a/PU alloys through thermal curing of binary mixtures of benzoxazine monomers and urethane prepolymers. The methodology included the use of differential scanning calorimetry (DSC) for curing behavior analysis, dynamic mechanical analysis (DMA) for thermo-mechanical properties, and thermogravimetric analysis (TGA) for thermal stability assessment.
2：Sample Selection and Data Sources:
Samples were prepared by mixing benzoxazine monomers with urethane prepolymers at specified mass concentrations and molecular weights.
3：List of Experimental Equipment and Materials:
Equipment included a Nicolet iS5 FT-IR spectrometer, DXR Raman Microscope, DSC1 Module, TGA1 STARe System, DMA242, and a homemade laser light scattering measurement apparatus. Materials included bisphenol-A, para-formaldehyde, aniline, poly(propylene glycol), and toluene diisocyanate.
4：Experimental Procedures and Operational Workflow:
The binary mixtures were thermally cured in an air-circulated oven with a step heating profile. Characterization techniques included ATR FT-IR spectroscopy, Raman microspectroscopy, DSC, DMA, TGA, and optical microscopy.
5：Data Analysis Methods:
Data analysis involved calculating the degree of conversion from DSC thermograms, determining glass transition temperatures from DMA spectra, and analyzing thermal stability from TGA thermograms.
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