研究目的
Investigating the influence of pressure during processing on the refractive index (RI) of polycarbonate (PC) by transmission measurements on glass-filled samples.
研究成果
The study demonstrated a clear pressure dependence of the RI of PC, with the RI increasing by 3.26 E-6 per bar with increasing pressure. This finding is crucial for high-precision optical applications where pressure-induced RI fluctuations must be considered.
研究不足
The study focuses on the pressure dependence of the RI, isolating it from other factors like cooling rate and stress states. However, the influence of cooling conditions after demolding and the cooling rate's effect on density were not considered, suggesting areas for future research.
1：Experimental Design and Method Selection:
The study used transmission measurements on glass-filled PC samples to isolate the pressure dependence of the RI from other influencing parameters.
2：Sample Selection and Data Sources:
Samples were prepared in a pvT instrument under constant cooling rate and temperature history.
3：List of Experimental Equipment and Materials:
A spectrometer was used for transmission measurements, and materials included PC type LQ2647 and optical glass type N-SK
4：Experimental Procedures and Operational Workflow:
Samples were produced at different pressures and cooled isobarically. Transmission measurements were performed over the sample height.
5：Data Analysis Methods:
The RI was determined by evaluating the wavelength of maximal transmission, and dispersion curves were modeled using Sellmeier and Cauchy approximations.
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