Two flexible and colorless polymers are synthesized based on a phosphorus-containing derivative of a bio-based aromatic aldehyde (4-hydroxybenzaldehyde) by a thiol-ene reaction. Thanks to the high polarizability of phosphorus and sulfur atoms, two polymers display refractive index (n) values of 1.721 and 1.698 at 546 nm, respectively. These data are much higher than those of polyphosphonates (below 1.65) and are comparable to those of polyphosphazenes with undesirable halogens (1.664–1.755). Moreover, both the polymers (TVP-TH1 and TVP-TH2) exhibit a transmittance of above 88% in the wavelength range from 550 to 2000 nm and a transmittance of about 0% in the UV region, indicating their potential application as transparent coatings for hindering the ultraviolet ray and infrared transmitting materials. In particular, these phosphorous-sulfide polymers display good thermostability with a glass transition temperature (T_g) of above 130 °C and 5% weight loss temperature (T_5d) of over 310 °C. These results imply that new phosphorous-sulfide polymers are very suitable as encapsulation resins for light-emitting diodes (LEDs) and optical materials and as antireflective coatings and microlenses for the image sensors of complementary metal oxide semiconductors (CMOSs).

中文翻译：

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源自生物基醛的具有高T _g和透明度的含磷和硫的高折射率聚合物

基于生物基芳族醛（4-羟基苯甲醛）的含磷衍生物通过硫醇-烯反应合成了两种柔性且无色的聚合物。由于磷和硫原子的高极化率，两种聚合物在546 nm处的折射率（n）分别为1.721和1.698。这些数据远高于聚膦酸酯的数据（低于1.65），并且与具有不受欢迎卤素的聚磷腈的数据相当（1.664-1.755）。此外，两种聚合物（TVP-TH1和TVP-TH2）在550至2000nm的波长范围内显示出高于88％的透射率，在UV区域中显示出约0％的透射率，表明它们潜在地用作透明涂层以阻碍紫外线和红外透射材料。特别地，这些硫化磷聚合物在玻璃化转变温度（T _g）高于130℃和5％失重温度（T _5d）高于310℃的情况下显示出良好的热稳定性。这些结果表明，新的硫化磷聚合物非常适合作为发光二极管（LED）和光学材料的封装树脂，以及作为互补金属氧化物半导体（CMOS）图像传感器的抗反射涂层和微透镜。