Optical characteristics and mechanism analysis of polycarbonate/poly(1, 4-cyclohexanedimethyl- 1, 4-cyclohexanedicarboxylate) blends
Yuhong CHEN1,*(), Xi LI2, Maosheng ZHAN2, Peng ZHAO3
1 Institute of Transparencies, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China 2 School of Material Science and Engineering, Beihang University, Beijing 100083, China 3 College of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China
PC/PCCD blends with different PCCD contents were prepared by melt blending. The optical performance test results show that PC/PCCD blends have high light transmittance and low haze. SEM, TEM, DSC, FTIR, 1H NMR and 13C NMR spectra test have been used to investigate PC/PCCD to reveal the internal mechanism of the optical transparency of the blends. The results show that PC/PCCD has a homogeneous structure at the scale of tens of nanometers, which is the direct reason for its high optical properties. All PC/PCCD blends with different PCCD contents show a single glass transition temperature, indicating that PCCD and PC are completely compatible. This complete compatibility leading to the homogeneous structure is the inherent reason for the high transparency of PC/PCCD blends. The mechanism of compatibility between PCCD and PC was further analyzed, and the results show that no transesterification reaction occurs during the melt blending of PC and PCCD. The compatibility of PC and PCCD results from the similarity between their molecular structure, and has nothing to do with whether the transesterification reaction occurs.
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