High Refractive Index Sulfur‐Containing Polymers (HRISPs)

Designing Ultrahigh-Refractive-Index Amorphous Poly(phenylene sulfide)s Based on Dense Intermolecular Hydrogen-Bond Networks

“…A high [ R ] value typically leads to a low Abbe number according to the Kramers–Kronig relationship, indicating that a polymer with high absorption in the near-UV-visible region should display a low Abbe number . This is because anomalous dispersion of the RI is generally observed at longer wavelengths as the [ R ] value is increased (i.e., the polarity of the polymer is so high that its intrinsic absorption is observed at a longer wavelength close to the visible light region). , Several HRIPs with ultrahigh RI values of 1.8–1.9 have been reported, − but their Abbe numbers (ν D ≤ 15) were considerably lower than the desired range.…”

Stereoselective Ring-Opening Polymerization of Lactones with a Fused Ring Leading to Semicrystalline Polyesters

“…Massive efforts have been devoted to the development of functional PCLs via substitution − on PCL or incorporation of heteroatoms to the main chain. − For example, poly­(1,5-dioxepan-2-one) (PDXO) containing both ester and ether functionalities in the polymer backbone was synthesized, and it demonstrated enhanced hydrophilicity compared with PCL. ,,, However, the complete amorphousness of PDXO limits its potential application scope. Besides, sulfur-containing polymers have established a variety of intrinsic merits and potential applications because they possess outstanding optical and electrical features and exhibit potential coordinating ability to heavy metal ions. − The introduction of sulfur atoms into PCL to generate poly­(1,4-oxathiepan-7-one) (POTO), an analogue of PDXO, has been reported to display a slightly higher glass transition temperature ( T g ) than PDXO. However, the crystallinity of POTO remained poor. , Further modifications on PDXO and POTO were expected to create superior materials with desired properties and potential applications.…”

Cobalt-Catalyzed Cascade C–H Activation/Annulation Polymerizations toward Diversified and Multifunctional Sulfur-Containing Fused Heterocyclic Polymers

“…SFH polymers make up an important group of optoelectronic polymers. However, most of the reported SFH polymers suffer from the poor aggregate-state luminescence as nanoparticles or solid films due to their rigid and planar backbone structures, which greatly limited their practical applications in fluorescence sensing, biological imaging, functional luminescent coating materials, etc. ,,− Considering the peculiarity of the present SFH polymer structures, where the triple-ring-fused heteroaromatic cores are surrounded by multiple rotatable phenyl rings, the photophysical properties of the obtained polymers were then systematically investigated.…”

“…Sulfur-containing fused heterocyclic (SFH) polymers serve as an important group of functional polymer materials with wide applications in organic optoelectronics, electrochemical devices, fluorescence sensing, biomedical fields, etc. , The coexistence of conjugated fused rings and plentiful sulfur atoms in polymer backbones endows SFH polymers with a series of attractive properties, such as excellent thermal and chemical stability, unique mechanical properties, special stimuli-responsive capabilities, high refractivity, and distinctive electrochemical activities as well as photoelectrical properties. − Along with the technological significance of SFH polymers are their synthetic difficulties. The most commonly used synthetic methods toward SFH polymers mainly include cross-coupling polymerizations, including Stille, Suzuki, Kumada, Negishi polycouplings, etc., and cyclization polycondensations.…”