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首页> 外文期刊>Journal of Applied Polymer Science >Rapid Fabrication of Organic/Organic Photonic Bandgap Films with Tuneable Mechanical Properties Using Blended Polymer Spheres
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Rapid Fabrication of Organic/Organic Photonic Bandgap Films with Tuneable Mechanical Properties Using Blended Polymer Spheres

机译：使用混合聚合物球快速制备具有可调谐机械性能的有机/有机光子带隙薄膜

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In this study, the photonic bandgap (PBG) film with tunable mechanical properties and photonic stop band was prepared by a simple and feasible approach. Colloid polymer spheres with a relatively large diameter (approximate D_n of 200 nm) and different glass transition temperatures (T_g) were blended with small polystyrene (PS) latex (D_n=20 nm) and were subsequently casted on a substrate for 3 h at 50oC for self-assembly of the PBG film. The monodispersed polymer spheres were synthesized by soap-free emulsion polymerization in the boiling state. The T_g values of the spheres were predetermined based on the Fox equation, and designed to fall in the region of -34oC to 112oC. Small PS could also be synthesized by this approach using the comonomer, sodium p-styrenesulfonate (NaSS), to ensure the small diameter. The long-range ordered structure constructed by embedding the small PS in the PBG film was indirectly confirmed on the basis of SEM analysis, from which the monochromatic film color was determined based on Bragg's diffraction law. Tunable film color was achieved by adjusting the diameter of the spheres, as evaluated using UV-Vis. Tunable mechanical properties of the PBG film were also achieved by varying the T_g of the spheres or the filling ratio of small PS. Based on these approaches, the ultimate tensile strength could be tuned in the region between 0.39 to 4.7 Mpa, and the relative strain could be varied from 1236% to 16%, illustrative of the excellent deformability of the film. Furthermore, by variation of these two parameters, the film properties could be changed from typical elastomer behavior to brittle plastic polymer type behavior, greatly extending the prospective application fields.
机译：在这项研究中，通过简单可行的方法制备了具有可调机械性能和光子阻带的光子带隙（PBG）薄膜。将具有相对较大直径（大约D_n为200 nm）和不同玻璃化转变温度（T_g）的胶体聚合物球与小的聚苯乙烯（PS）胶乳（D_n = 20 nm）混合，然后在50oC下浇铸到基材上3 h用于PBG膜的自组装。通过无皂乳液聚合在沸腾状态下合成单分散的聚合物球。球体的T_g值是根据Fox方程预先确定的，并被设计为介于-34oC至112oC之间。也可以使用共聚单体对苯乙烯磺酸钠（NaSS）通过这种方法合成小PS，以确保小直径。通过在SEM分析的基础上间接确认了将小PS嵌入PBG膜中构成的长程有序结构，并根据布拉格衍射定律确定了单色膜的颜色。可调节的薄膜颜色是通过调节球体的直径来实现的，如使用UV-Vis评估的那样。 PBG膜的可调机械性能也通过改变球体的T_g或小PS的填充率来实现。基于这些方法，可以在0.39至4.7 Mpa之间的范围内调整极限抗拉强度，相对应变可以在1236％至16％之间变化，这说明了薄膜的优异可变形性。此外，通过改变这两个参数，可以将膜性能从典型的弹性体性能改变为脆性的塑料聚合物类型性能，从而大大扩展了预期的应用领域。

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