Highly refractive, transparent, and solution processable polyamides based on a noncoplanar ortho-substituted sulfonyl-bridged diacid monomer containing chlorine side groups

High refractive index materials: A structural property comparison of sulfide‐ and sulfoxide‐containing polyamides

“…0 -Sulfoxide-bis(4-chlorophenol) (1b) was synthesized according to the modified procedure reported in our previous study 17 and recrystallized twice from isopropyl alcohol.…”

“…In this regard, introduction of flexible bonds, kinked structures, alicyclics, and bulky groups were frequently considered . Another structural modification approach to enhance the processability of rigid‐rod polymers is by modifying the substitution pattern of aromatic units in the main chain . Hence, inclusion of n,n ′‐disubstituted biphenylene ( n = 1–3) and 1,2‐linked units derived from ortho ‐catenated aromatic rings are mainly used.…”

“…Hence, inclusion of n,n ′‐disubstituted biphenylene ( n = 1–3) and 1,2‐linked units derived from ortho ‐catenated aromatic rings are mainly used. Since 2006, our group has started a systematic project to develop processable polymers using various ortho ‐linked sulfide‐, sulfoxide‐, and sulfone‐containing monomers . It was found that the phenyl rings are forced by the ortho ‐linked pattern into a noncoplanar conformation which improves processability through reducing intermolecular forces between the polymer chains and lowering crystallization tendency.…”

“…[7][8][9][10][11][12][13][14] Another structural modification approach to enhance the processability of rigid-rod polymers is by modifying the substitution pattern of aromatic units in the main chain. [15][16][17] Hence, inclusion of n,n 0 -disubstituted biphenylene (n 5 1-3) 18 and 1,2-linked units derived from ortho-catenated aromatic rings 11,19 are mainly used. Since 2006, our group has started a systematic project to develop processable polymers using various ortho-linked sulfide-, sulfoxide-, and sulfone-containing monomers.…”

“…Recently, we also reported a series of chlorinated PAs bearing flexible linkages and bulky sulfonyl moieties. 17 The synergic effects of these functional groups provided PAs with n av of 1.7069-1.7245 and low Dn of 0.0061-0.0073 at 632.8 nm.…”