Abstract

Poly (ethyl methacrylate) (PEMA) - cellulose acetate propionate (CAP) blend film was prepared using the cast technique. A Q-switched Nd: YAG laser beam with a wavelength of 266 nm, a pulse duration of 10-ns, a repetition rate10 Hz and 0.018 J/cm² fluence was used to irradiate the prepared film. The optical absorption of pristine and irradiated sample was studied within 200–500 nm wavelength region. The absorbance increases with laser irradiation time over the full wavelength region which is attributed to an increase of the crosslinking network. Examining Tauc plots revealed a transition of the direct allowed type with optical energy gap value of 4.92 eV for the pristine blend film which has decreased to 4.30 eV after laser irradiation for 90 min. The refractive index, finesse coefficient, dielectric function, Brewster, and critical angles demonstrated dispersion in the 200–500 nm wavelength range.

中文翻译：

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Nd：YAG激光辐照聚（甲基丙烯酸乙酯）-乙酸丙酸纤维素共混膜的光学性能

摘要

使用流延技术制备聚（甲基丙烯酸乙酯）（PEMA）-乙酸丙酸纤维素（CAP）共混膜。Q开关Nd：YAG激光束，波长为266 nm，脉冲持续时间为10 ns，重复频率为10 Hz，0.018 J / cm ²能量密度用于辐照制备的膜。在200–500 nm波长范围内研究了原始和辐照样品的光吸收。在整个波长范围内，吸光度随激光照射时间的增加而增加，这归因于交联网络的增加。检查Tauc图可知，原始混合膜的光能隙值为4.92 eV的直接允许类型过渡，在激光照射90分钟后已降至4.30 eV。折射率，精细系数，介电函数，布鲁斯特和临界角证明在200–500 nm波长范围内分散。