In this study, the influence of pressure during processing on the refractive index (RI) of polycarbonate (PC) was investigated by transmission measurements on glass‐filled samples with a spectrometer. In order to isolate the pressure dependence of the RI from other influencing parameters such as cooling rate, orientation and stress states, the samples were prepared in a pressure‐specific volume‐Temperature (pvT) instrument under constant cooling rate and temperature history and without shear effects. Subsequently, the RI was determined at the intersection of the dispersion curves of the glass and the polymer by evaluating the wavelength of the maximal transmission of the samples. The mean RI over the entire cross section of the sample is determined by the transmission measurements without complex sample preparation. The investigations show that the RI of PC increases by 3.26 E‐6 per bar with increasing pressure. POLYM. ENG. SCI., 60:512–516, 2020. © 2019 The Authors. Polymer Engineering & Science published by Wiley Periodicals, Inc. on behalf of Society of Plastics Engineers.

中文翻译：

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通过玻璃样品的透射测量分析聚碳酸酯的加工压力相关折射率

在这项研究中，通过使用分光计对玻璃填充样品进行透射测量，研究了加工过程中压力对聚碳酸酯（PC）折射率（RI）的影响。为了将RI的压力依赖性与其他影响参数（例如冷却速率，取向和应力状态）隔离开来，在恒定的冷却速率和温度历史且无剪切的情况下，在压力特定的体积-温度（pvT）仪器中制备样品效果。随后，通过评估样品最大透射率的波长，在玻璃和聚合物的分散曲线的交点处确定RI。样品整个横截面的平均RI由透射测量确定，而无需进行复杂的样品制备。研究表明，随着压力的增加，PC的RI增加了3.26 E-6 / bar。POLYM。ENG。SCI。，60：512–516，2020.©2019作者。Wiley Periodicals，Inc.代表塑料工程师协会出版的《聚合物工程与科学》。