以下为句子列表：
英文: During the accelerated thermal aging and ultraviolet radiation aging of PMMA which is used as the core materials of fiber in POF, it was found that the relative permittivity of PMMA decreased significantly to approximately equal to its square refractive i
中文: 摘要实验中观察到用作塑料光纤纤芯材料的纯有机玻璃（聚甲基丙烯酸甲酯）在加速热老化和紫外老化过程中其相对电容率急剧下降至大约等于其折射率的平方，即有机玻璃由极性聚合物变为非极性聚合物（“全去偶极子极化”现象）。
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