Effect of Linker Structure on the Refractive Index of Sulfur-Containing Thermoplastics
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초록
내용
High refractive index polymers (HRIPs) are now crucial components in a wide range of optoelectronic devices, including substrates for displays microlenses for CCD or CMOS image sensors, and as optical adhesives. The most widely used approach for the synthesis of HRIPs is to incorporate aromatic units into polymer structures. This approach, however, may lead to excessively high glass transition temperature and, more importantly, increased chromatic aberration and birefringence. To overcome this problem, a sulfur-containing functional group with a high molar refractive index was included, and a monomer with a cardo structure was synthesized to minimize birefringence, a characteristic more prominent in thermoplastic polymers than in thermoset polymers. Thermoplastic polyesters, poly(aryl ether)s, and poly(aryl thioether)s have been synthesized from a single monomer core structure and refractive indexes of over 1.65, coupled with birefringence below 0.003 were achieved.