Creation of Controllable Refractive Index Polymers Using Nano-pore of Macrocyclic Hyperbranched Polymers

基于新概念设计新型低折射率材料是一个重要而又具有挑战性的研究课题。本工作旨在利用超支化聚合物（HBP_s）设计新型低折射率材料。氟含量可以通过改变进料比和折射率值来控制，且氟含量随氟含量的增加而降低。随着共聚单体结构尺寸的增大，基于双层倍半硅氧烷的HBP的折射率有减小的趋势。杯[8]芳烃基HBP具有较高的Tg和较低的n D，这是由于单体的大刚性空腔结构和聚合物的支化结构的结合。它们具有高度支化的三维刚性空腔结构，阻止了由于微凝胶的存在而导致的聚合物密度的增加，并导致相对较低的n D

Designing a novel low refractive index material based on a new concept is an important and a challenging research topic. This work aimed to design novel low-refractive index materials using hyperbranched polymers (HBP_s). The fluorine content of the HBPs could be controlled by changing the feed ratio and the refractive index values of the HBPs, and it tended to decrease with increasing fluorine content. The values of the refractive index of HBPs based on double-decker-shaped silsesquioxane tended to decrease with increasing structure size of co-monomers. Furthermore, HBP based on calix[8]arene showed a higher T_g and a lower n_D due to the combination of large rigid cavity structure of monomer and branched structure of polymer. Their three-dimensional rigid cavity structures with highly branched architecture prevent the increasing density of polymers due to the presence of microgels, and lead to a relatively lower n_D