Synthesis and characterization of novel thermally stable aromatic and semiaromatic polyamides derived from thiourea-based flexible diacid dichlorides |
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Authors: | Ayesha Kausar Sonia Zulfiqar Liaquat Ali and Muhammad Ilyas Sarwar |
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Institution: | (1) Department of Chemistry, Quaid-i-Azam University, Islamabad, 45320, Pakistan; |
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Abstract: | Abstract New diacid dichlorides bearing phenyl thiourea groups were prepared by a facile synthetic approach and characterized using
spectroscopic and elemental analyses. A series of novel aromatic and semiaromatic polyamides were prepared via a condensation
route from the synthesized diacid dichlorides with 4,4′-oxydianiline. The polymers were characterized by FT-IR, 1H NMR, 13C NMR, and their physical properties, including their solution viscosities, solubilities and thermal properties, were studied
too. Polyamides with phenyl thiourea moieties in the backbone showed good solubilities in amide solvents such as DMAc, DMF,
DMSO, and NMP. All of the synthesized polymers had η
inh values of 0.042–0.053 dm3/g, and were obtained in quantitative yield. GPC measurements of the synthesized polyamides indicated M
w values of 64,759–86,172. The crystallinity of the polymers was evaluated via their X-ray diffraction patterns. Their glass
transition temperatures were found to be 218–229 °C. Furthermore, thermogravimetric analysis indicated that the polymers were
thermally stable in the range 300–398 °C in a N2 atmosphere. |
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