Journal of Polymer Science, Part A: Polymer Chemistry p. 3505 - 3515 (2013)
Update date:2022-08-04
Topics:
Javadi, Ali
Shockravi, Abbas
Kamali, Mahmood
Rafieimanesh, Atefeh
Malek, Ali M.
A series of new organic-soluble polyamides (PAs) bearing flexible thioether linkages and heteroaromatic thiazole units were synthesized from a novel thioether-bridged diamine monomer (DA) and various commercially available aromatic dicarboxylic acids (1-5) via a direct polycondensation method. The resulting polymers were obtained in high yields and possessed inherent viscosities in the range of 0.41-0.80 dL g-1. All of the polymers were amorphous in nature, exhibited good solubility and could be easily dissolved in amide-type polar aprotic solvents and even dissolved in less polar solvents (e.g., tetrahydrofuran, pyridine, and acetone). They showed excellent thermal stability with glass transition temperatures between 207 and 239°C and 10% weight loss temperatures in excess of 424°C in nitrogen and 469°C in air atmosphere. The optical transmittances of the PA films at 450 nm were higher than 85% for the thickness of ~10 μm. The combination of the thiazole moieties and flexible thioether linkages provided PAs with high average refractive indices (nav) of 1.7414-1.7542 and low birefringences (Δn) of 0.0061-0.0087 at 632.8 nm. In particular, the nav of PA-5 derived from DA and 2,2′-dithiodibenzoic acid exhibited the highest refractive index (1.7542) in the high refractive index PAs.
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