Radical chemistry in polymer science: an overview and recent advances

• Zixiao Wang,
• Feichen Cui,
• Yang Sui and
• Jiajun Yan

Beilstein J. Org. Chem. 2023, 19, 1580–1603, doi:10.3762/bjoc.19.116

• weight. The simple setup, mild conditions, absence of unfavored byproducts, orthogonality with other reactions, and high yields (nearly full conversion) [82] made thiol–ene polymerizations an ideal way to produce high-molecular-weight cross-linked polymers, optical polymers, biomacromolecules, and

• high refractive-index polymers. A common approach is to incorporate atoms or groups with high polarizability and sulfur is a typical constituent with high molar refractivity and is widely used in optical polymers. For example, Bhagat et al. [84] produced polymers with high cross-linking density and

Synthesis and characterization of a novel carboxyl group containing (co)polyimide with sulfur in the polymer backbone

• Miroslav Mrsevic,
• David Düsselberg and
• Claudia Staudt

Beilstein J. Org. Chem. 2012, 8, 776–786, doi:10.3762/bjoc.8.88

• high-performance coating materials. Keywords: DABA; functional (co)polyimides; optical polymers; sulfur-containing polymers; transparency; Introduction Over the past few years, various new applications have drawn the attention of industry to materials with superior mechanical, thermal and chemical

• and 6FDA-4,4′-SDA/6FDA-DABA 4:1 are exemplarily compared to their respective homopolymers and also to commercially available optical polymers, such as poly(methylmethacrylate) and the recently developed cyclo-olefin polymer Zeonex E48R®, which were measured under similar conditions (50 °C, 90

• (co)polyimides showed very low moisture uptake, at less than 0.04 wt %, and high transparencies between 84% and 86%, which are crucial requirements for optical polymers. Experimental Materials N,N-dimethylacetamide (DMAC), was obtained from Merck (>99%, for synthesis). The solvent was heated under

Imidazole as a parent π-conjugated backbone in charge-transfer chromophores

• Jiří Kulhánek and
• Filip Bureš

Beilstein J. Org. Chem. 2012, 8, 25–49, doi:10.3762/bjoc.8.4

• , higher thermal stability, and NLO responses as well as prospective applicability in modern materials chemistry. The second-order susceptibilities of nonlinear optical polymers are historically referred to as “dij” coefficients (1/2 of the respective χij(2) values). The electro-optic coefficient rij

• where n is the index of refraction. However, only two components of the d and r coefficients that are parallel and perpendicular to the average dipolar chromophore axis are important and investigated (d33, d31 and r33, r31). The physical stability of the nonlinear optical polymers refers to the

• (DMBPDI) [18]. However, the measured nonlinearities and thermal stabilities of these polymers did not exceed that measured for 119 (Table 14). Tang et al. showed another approach to producing nonlinear optical polymers. The synthetically easily available hydroxy lophine 124 was covalently bonded to the