Cyclic allylic sulfide based photopolymer for holographic recording showing high refractive index modulation,Journal of Polymer Science

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Cyclic allylic sulfide based photopolymer for holographic recording showing high refractive index modulation
Journal of Polymer Science ( IF 3.9 ) Pub Date : 2021-05-07 , DOI: 10.1002/pol.20210192
Paola Galli ₁ , Richard A. Evans ₂ , Chiara Bertarelli ₃ , Andrea Bianco ₁

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The development and characterization of a new holographic photopolymer system showing high refractive index modulation (∆n) is presented. It exploits the ring-opening polymerization reaction of a cyclic allylic sulfide (CAS) monomer, which is dispersed in a cellulose acetate butyrate (CAB) polymer matrix together with a blue sensitive radical photoinitiator. Volume Phase Holographic Gratings (VPHGs) obtained using these films show a very good fidelity of the transferred pattern, without deviations from the theoretical curves. A high ∆n is obtained due to the addition to this system of a tetrafunctional thiol crosslinker, which maximizes the material potential (formula limit) of the formulation. It also allows for a thermal post process of the gratings, further enhancing the ∆n. The photopolymer properties are evaluated as function of the monomer and thiol concentration to determine the optimal composition, at which a ∆n greater than 0.03 is obtained. This is a considerably high value in the field of photopolymers for holography and it enables the manufacturing of efficient holograms.

中文翻译：

用于全息记录的环烯丙基硫化物基光聚合物显示出高折射率调制

展示了具有高折射率调制 (Δn) 的新型全息光聚合物系统的开发和表征。它利用环状烯丙基硫化物 (CAS) 单体的开环聚合反应，该单体与蓝色敏感的自由基光引发剂一起分散在醋酸丁酸纤维素 (CAB) 聚合物基质中。使用这些薄膜获得的体相全息光栅 (VPHG) 显示出非常好的转移图案保真度，与理论曲线没有偏差。由于在该系统中添加了四官能硫醇交联剂，从而使配方的材料潜力（配方极限）最大化，因此获得了高 Δn。它还允许对光栅进行热后处理，进一步提高 ∆n。根据单体和硫醇浓度来评估光聚合物的特性，以确定最佳组合物，在该组合物中，Δn 大于 0.03。这在全息光聚合物领域具有相当高的价值，并且可以制造高效的全息图。

更新日期：2021-07-02

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