Synthesis of aramids by bulk polycondensation of aromatic dicarboxylic acids with 4,4′-oxydianiline

Shoji, Yu; Zhang, Cenyao; Higashihara, Tomoya; Ueda, Mitsuru

doi:10.1039/c2py20225e

Cited by 13 publications

(7 citation statements)

References 9 publications

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“…At laboratory scale and for specific time durations, alternative processing methodologies for the condensation of carboxylic diacid or dichloride as well as aromatic or aliphatic diamines have been reported. In accordance with green chemistry principles, the condensation of diacid or diacid dichloride and diamines has been reported and the solid-state preparation of aramids has been described by Ueda and colleagues [16,17]. The direct polycondensation of aromatic diacid chlorides and diamines at high temperature without consuming condensation promoters has been well discussed by Kobashi et al [18].…”

Section: Alternative Synthetic Methodsmentioning

confidence: 94%

Progress in the chemistry of functional aramids properties

Mishra

Madhad

Vasava

2021

Journal of Heterocyclic Chem

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High-performance polymers based on amide aromatic rings are known as wholly aromatic polyamides or aramids. The arrangement and admirable properties of aramids are built on the basis of amide linkage and rigid aromaticity. Aramids are attractive because of their extraordinary bond strengths and very high stiffness. Synthetic aromatic polymeric chains provide increased mechanical resistance and thermal softening compared to aliphatic aramids.In addition, aramids exhibit high thermal stability, low creep, and good optical activity with fluorescence. Hence, aramids are found in advanced arenas for engineering thermoplastics such as transport applications, electroactive materials, films, bullet-proof body armor, smart materials, protective clothing, fibers, in nanocomposites as asbestos alternatives, cutting edge complexes in arming, high-temperature lining material, in space engineering, and more. The objective of this review is to make the field of aramids functionality more accessible to the materials science community, that is, scientists, academicians, and engineers.

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Section: Alternative Synthetic Methodsmentioning

confidence: 94%

Progress in the chemistry of functional aramids properties

Mishra

Madhad

Vasava

2021

Journal of Heterocyclic Chem

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“…Nevertheless, among the time span covered by this review and at lab scale, alternative procedures to the conventional condensation of diacid or diacid dichloride and diamines have been reported. From the green chemistry viewpoint, Ueda et al reported on the solid-state preparation of aramids [ 11 , 12 ], and Kobashi et al discussed the direct condensation of aromatic diacids and diamines at high temperature without condensation promoters [ 13 ].…”

Section: Synthesis and Processingmentioning

confidence: 99%

Functional Aromatic Polyamides

et al. 2017

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Abstract:We describe herein the state of the art following the last 8 years of research into aromatic polyamides, wholly aromatic polyamides or aramids. These polymers belong to the family of high performance materials because of their exceptional thermal and mechanical behavior. Commercially, they have been transformed into fibers mainly for production of advanced composites, paper, and cut and fire protective garments. Huge research efforts have been carried out to take advantage of the mentioned characteristics in advanced fields related to transport applications, optically active materials, electroactive materials, smart materials, or materials with even better mechanical and thermal behavior.

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“…Bulk and melt polycondensation are the most commonly used commercial synthetic methods for the large-scale production of TLCP. [24][25][26] Acetylated hydroxyl compounds and free carboxylic acids are the typical monomers used in TLCP melt polycondensation. 27 Alternatively, feeding mixtures of diol(s) and dicarboxylic acid(s) together into the reactor with an excess of acetic anhydride is another approach, wherein, the mixtures are allowed to mix well in an inert and dry atmosphere and simultaneously heated by increasing the temperature in a step-wise fashion.…”

Section: Introductionmentioning

confidence: 99%