Development of Polarizer Using Anisotropic Light Scattering in Polymer

我们展示了由定向双组分非晶聚合物共混物制备的聚合物线性偏振片的光学特性。混合光的分散相折射率与双折射连续相的普通折射率接近，同时在垂直方向上产生折射率失配。因此薄膜是透明的还是不透明的取决于入射光的偏振方向。然而，紫外可见光谱测量的透射率和偏振效率都依赖于入射波长，这归因于小颗粒光散射的波长依赖性。为了消除这一特性，我们尝试增加分散相的长度。通过改变分散相含量，可以将颗粒（分散相）粒径控制在垂直方向，但不能将颗粒粒径增加到拉伸方向。因此，我们在聚合物基体中引入定向纤维来代替分散相，从而使聚合物的粒径向折射率失配方向增大。透过率和偏振效率都得到了极大的提高。结果发现，前后方向的光强之和接近于一，这表明由于吸收等原因造成的光损失几乎消除了。在不透明状态下，大部分入射光（80%）向后散射，而在透明状态下，90%的入射光向前透射。这一特性在用于光循环的设备中特别有用，这些设备旨在提高从自然光产生偏振光的效率。除了产生线偏振光的高效率外，偏振光片还具有各种其他潜在的优点。与二向色偏振片相比，它具有更强的耐温、耐湿性和更强的光稳定性，这些特性在投影显示器、投影屏幕和汽车仪表板显示器中都很有用。少

We demonstrate optical characteristics of polymeric linear polarizers produced from oriented two-component amorphous polymer blends. Refractive index of dispersed phase of blend is closely to ordinary refractive index of birefringent continuous phase, while refractive index mismatch is simultaneously generated in the perpendicular direction. Films are therefore transparent or opaque depending on the polarization direction of the incident light.However, both transmittance and polarizing efficiency measured by UV-VIS spectra depends on incident wavelength, which is ascribed to wavelength dependence of light scattering by small particles. To eliminate this character, we tried to increase length of dispersed phase to drawing direction. By changing dispersed phase contents, we could control particle (dispersed phase) size to the perpendicular direction, but could not increase particle size to the drawing direction.So we introduce aligned fibers in polymer matrix instead of dispersed phase, … More which increase particle size to the refractive index mismatch direction. Both transmittance and polarizing efficiency were drastically improved.It was found that the sum of the light intensities in the forward and backward direction approaches unity, which indicates that light losses due to, for instance, absorption are virtually eliminated. In the opaque state, a large portion of the incident light (80 %) is scattered in the backward direction, whereas in the transparent state 90 % of the incident light is transmitted in the forward direction. This feature is especially useful in devices that are constructed to recycle light and that are designed to enhance the efficiency to produce polarized light from natural light.Apart from a high efficiency to produce linearly polarized light, the polarizers possess a variety of other potential advantages. In comparison to dichroic polarizers, an enhanced temperature and humidity resistance and an enhanced light stability are expected, which are useful properties in, for instance, projection displays, projection screens, and displays in automotive dashboards. Less