Synthesis and characterisation of polyaniline catalysed and doped by squaric acid

Zhan, Caimao; Zeng, Jianjun; Li, Yuliang; Yang, Xi; Qin, Jingui

doi:10.1016/s0379-6779(98)01226-0

Cited by 4 publications

(4 citation statements)

References 4 publications

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“…When the HCl concentration was increased, the amount of PAn deposited on PET fiber increased and after giving a maximum at the 0.5 mol L 1 , it decreased rapidly ( Figure 2). The effect of acid concentration on the PAn yield and conductivity of composite fiber was similar in comparision with that in the synthesis of pure conducting polymer [18,19].…”

Section: Resultssupporting

confidence: 72%

The preparation and characterization of conductive poly(ethylene terephthalate)/polyaniline composite fibers using benzoyl peroxide

2008

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Conductive polyaniline (PAn)/poly(ethylene terephthalate) (PET) composite fibers were prepared by chemical polymerization of aniline in the presence of PET fibers using benzoyl peroxide (Bz 2 O 2 ) in organic solvent/aqueous hydrochloric acid mixtures. The effects of polymerization conditions such as organic solvent/water ratio, oxidant, aniline and hydrochloric acid concentrations and temperature were investigated on the amount of PAn deposited on PET fiber and the electrical surface resistance of composite fibers. The maximum PAn content and the lowest electrical surface resistance of composite fibers were observed at HCl concentrations of 0.5 mol L 1 . The properties of PAn/PET composite fibers such as density, diameter, tensile strength and breaking elongation were also investigated in comparison with those of pure PET. Characterization of conductive composite fibers was carried out by FTIR, TGA, SEM techniques, surface resistance measurements, and cross section images taken by optical microscope.

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Section: Resultssupporting

confidence: 72%

The preparation and characterization of conductive poly(ethylene terephthalate)/polyaniline composite fibers using benzoyl peroxide

2008

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“…In this context, in the present investigation, ethylene brassylate was copolymerized with squaric acid (SA), a very strong acid suitable for strong intermolecular hydrogen bonds [ 27 ]. As a versatile organic molecule, SA was also used in various fields including polycondensation processes or bioconjugates preparation [ 28 , 29 , 30 , 31 , 32 , 33 , 34 ].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Poly(Ethylene Brassylate-Co-squaric Acid) as Potential Essential Oil Carrier

Chiriac¹,

Rusu²,

Niţă³

et al. 2021

Pharmaceutics

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Bio-based compounds are a leading direction in the context of the increased demand for these materials due to the numerous advantages associated with their use over conventional materials, which hardly degrade in the environment. At the same time, the use of essential oils and their components is generated mainly by finding alternative solutions to antibiotics and synthetic preservatives due to their bioactive characteristics, but also to their synergistic capacity during the manifestation of different biological properties. The present study is devoted to poly(ethylene brassylate-co-squaric acid) (PEBSA), synthesis and its use for thymol encapsulation and antibacterial system formation. The synthesized copolymer, performed through ethylene brassylate macrolactone ring-opening and copolymerization with squaric acid, was physicochemical characterized. Its amphiphilic character allowed the entrapment of thymol (Ty), a natural monoterpenoid phenol found in oil of thyme, a compound with strong antiseptic properties. The copolymer chemical structure was confirmed by spectroscopic analyses. Thermal analysis evidenced a good thermal stability for the copolymer. Additionally, the antimicrobial activity of PEBSA_Ty complex was investigated against eight different reference strains namely: bacterial strains—Staphylococcus aureus ATCC25923, Escherichia coli ATCC25922, Enterococcus faecalis ATCC 29212, Klebsiella pneumonie ATCC 10031 and Salmonella typhimurium ATCC 14028, yeast strains represented by Candida albicans ATCC10231 and Candida glabrata ATCC 2001, and the fungal strain Aspergillus brasiliensis ATCC9642.

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“…The role of the squaric acid as catalyst is still not clear [59][60][61]. 1 Brønsted acidity is the main factors that influence the reactivity and selectivity of the process.…”

Section: Results and Dissociationmentioning

confidence: 99%

“…1 Although squaric acid has been known as a commercially available strong acid, squaric acid itself has attracted little attention from the synthetic community mainly due to its extremely poor solubility in organic solvents [59,60]. Recently, some groups have developed a new chiral Brønsted acid from the squaric acid scaffold and successfully used in asymmetric organic synthesis [61].…”

Section: Results and Dissociationmentioning

confidence: 99%

Squaric acid as an impressive organocatalyst for Michael addition in water

Azizi

Saki

Edrisi

2011

Comptes Rendus. Chimie

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A simple, green, and environmentally benign protocol for squaric acid (5 mg) catalyst conjugate addition of aromatic amines and thiols to unsaturated carbonyl compounds in water in good to excellent yields is developed. The advantages of low sensitivity toward moisture and oxygen, high tolerance of different functional groups, green reaction media and efficient recyclability make this organocatalyst suitable for both laboratory and industrial scale synthesis of b-substituted carbonyls under very mild conditions.

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Synthesis and characterisation of polyaniline catalysed and doped by squaric acid

Cited by 4 publications

References 4 publications

The preparation and characterization of conductive poly(ethylene terephthalate)/polyaniline composite fibers using benzoyl peroxide

The preparation and characterization of conductive poly(ethylene terephthalate)/polyaniline composite fibers using benzoyl peroxide

Synthesis of Poly(Ethylene Brassylate-Co-squaric Acid) as Potential Essential Oil Carrier

Squaric acid as an impressive organocatalyst for Michael addition in water

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