聚碳酸酯/聚(1, 4-环己烷二甲酸- 1, 4-环己烷二甲醇酯)共混物的光学特性及机理分析

采用熔融共混法制备一系列聚碳酸酯(PC)与聚(1, 4-环己烷二甲酸-1, 4-环己烷二甲醇酯)(PCCD)形成的共混物。光学性能测试表明，PC/PCCD共混物具有高透光率、低雾度的光学特征。采用SEM、TEM、DSC、红外光谱及核磁共振等多种手段对PC/PCCD进行研究，以揭示共混物呈现光学透明性的内在机理。结果表明：PC/PCCD在几十纳米尺度下具有均相结构，均相结构是其在宏观上表现高透明性的直接原因; 不同PCCD含量的PC/PCCD共混物均表现出单一玻璃化温度，表明PC和PCCD完全相容。这种均相结构的完全相容，是PC/PCCD共混物呈现高透明性的内在原因。通过进一步分析PCCD和PC相容的机理，发现PC与PCCD熔融共混过程中未发生酯交换反应，PC和PCCD的相容源于结构相似，与是否发生酯交换反应无关。

Optical characteristics and mechanism analysis of polycarbonate/poly(1 ,4-cyclohexanedimethyl-1 ,4-cyclohexanedicarboxylate)blends

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.