Synthesis and Properties of High‐Refractive‐Index Iodine‐Containing Polyacrylates

Abstract

We examined the radical polymerization of 2,4,6‐triiodophenyl acrylate (TIPA), the chain‐transfer radical polymerization of TIPA in the presence of 4,4‐thiobisbenzenethiol (TBBT) or 4‐mercaptopyridine (MP), and the radical copolymerization of TIPA with 2‐hydroxyethyl acrylate (HEA) or 2‐(2‐ethoxyethoxy) ethyl acrylate (EEA), using AIBN as an initiator at 60 °C for 20 h. These reactions afforded poly(TIPA), TBBT‐poly(TIPA)m, MP‐poly(TIPA)m poly(TIPAm‐co‐HEAn) and poly(TIPAm‐co‐EEAn), respectively, with Mn values in the range of 3,180 to 46,550, in satisfactory yields. MP‐poly(TIPA)41 (Mn=6,880), poly(TIPA88‐co‐HEA12) (Mn=11,300), and poly(TIPA85‐co‐EEA15) (Mn=19,200) showed film‐forming ability, although poly(TIPA) and TBBT‐poly(TIPA)m did not. Among them, poly(TIPA85‐co‐EEA15) showed high values of refractive index (n) and Abbe number (ν), i. e., n=1.850 and ν=20.7.

Design, synthesis and characterization of high refractive index aromatic polyesters containing fluorene and thioether groups

“…Positron Annihilation Lifetime Spectroscopy (PALS) was measured using a fast-slow coincidence scheme. A 13μ Ci 22 Na positron source was sandwiched between two 1 mm thick polymer disks to ensure that the positrons were not penetrated.…”

“…13 According to the Lorentz-Lorenz equation, a general way to increase the refractive index of polymers is to introduce atoms or groups with low molar volume (V m ) and high molar refractive index ([R]). 8,14 A typical strategy for designing HRIPs is to incorporate atoms or groups with highly polarizability and high [R] into the polymer chain, such as aromatic hydrocarbons, sulfur, 15,16 selenium, 17,18 phosphorus, [19][20][21] and halogen (except fluorine), 22 which are effective candidates for high refractive index polymers.…”

Supramolecular Cross-Linking of Thiophenylene Polymers via Multiple Hydrogen Bonds toward High Refractive Index

“…A typical strategy for designing HRIPs is the introduction of highly polarizable and compact substituents, such as aromatics or sulfur, into the polymer. ,− Various high-refractive elements have been investigated, resulting in polymers containing uncommon substructures (heavy halogens, chalcogens, − and bismuth atoms, etc.) with higher RI (∼1.7–1.85).…”