The effect of plasticizer on dielectric properties of poly(methyl methacrylate) (PMMA)/titanium dioxide (TiO₂) composites was investigated. Propylene carbonate (PC) was used as plasticizer in the samples which were prepared with the conventional solvent casting technique. Scanning Electron Microscopy with Energy Dispersive X-Ray Analysis (SEM-EDX) and Differential scanning calorimetry (DSC) analyses and LCR Meter measurements (performed between 300 K and 400 K), were conducted to examine the properties of the composites. With the addition of plasticizer, the thermal properties have changed and the dielectric constant of the composite has increased significantly. The glass transition temperature of pure PMMA measured 121.7°C and this value did not change significantly with the addition of TiO₂, however, 112°C was measured in the sample with the addition 4 ml of PC. While the dielectric constant of pure PMMA was 3.64, the ε′ value increased to 5.66 with the addition of TiO₂ and reached 12.6 with the addition of 4 ml PC. These changes have been attributed to increase in amorphous ratio that facilitates polymer dipolar and segmental mobility.

研究了增塑剂对聚甲基丙烯酸甲酯（PMMA）/二氧化钛（TiO ₂）复合材料介电性能的影响。在通过常规溶剂浇铸技术制备的样品中，碳酸亚丙酯（PC）被用作增塑剂。进行了具有能量色散X射线分析（SEM-EDX）和差示扫描量热法（DSC）分析和LCR仪测量（在300 K至400 K之间）的扫描电子显微镜，以检查复合材料的性能。添加增塑剂后，热性能发生了变化，复合材料的介电常数也显着提高。纯PMMA的玻璃化转变温度为121.7°C，该值在添加TiO _2时没有明显变化。但是，在加入4 ml PC的情况下，样品的温度为112°C。当纯PMMA的介电常数为3.64时，添加TiO _2时ε'值增加到5.66，而添加4 ml PC时ε'值达到12.6。这些变化被归因于非晶态比率的增加，其促进了聚合物的偶极和分段流动性。