Quick analysis of composition of semi-aromatic copolyamide via 13C NMR study

Zhang, Chuanhui; Cao, Min; Jiang, Sujun; Huang, Xianbo; Mai, Kancheng; Yan, Kun

doi:10.1080/1023666x.2018.1514708

Cited by 4 publications

(2 citation statements)

References 25 publications

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“…According to the solid 13 C NMR spectrum as shown in Figure 2, the signal observed at the chemical shift 123 -136 ppm is attributed to the characteristic peak of the carbon atom on the benzene ring, and the signal at 166 ppm is attributed to the characteristic peak of the middle carbon atom of the amide group, which mirrors the chemical shift of the characteristic peak of the polyamide unit in the literature [11].…”

Section: Nuclear Magnetic Resonance (Nmr) Carbon Spectrum Analysissupporting

confidence: 58%

Synthesis, Characterization and Properties of Polymeric p-Benzoyl-4,4'-Diaminobenzoylaniline

Mi,

Yuan,

Zhang

et al. 2023

MSCE

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An aromatic polyamide was synthesized by low-temperature poly-condensation reaction from terephthaloyl chloride and 4,4'-diaminobenzanilide (4,4'-DABA). The synthesized polyamide had a characteristic peak of carbon atoms in the amide group at 166 ppm, which was demonstrated by the solid nuclear magnetic resonance carbon spectrum. It was shown to be the stretching vibration absorption peak of the amide N-H bond at 3342 cm −1 by Fourier infrared (FT-IR) spectroscopy. It was obtained that the energy band near 1100 -1276 cm −1 belongs to the absorption peak of the para-substituted benzene ring and the band near 2977 cm −1 was the C-H stretching vibration peak of the benzene ring by Raman spectroscopy. The molecular structure of the synthesized polyamide compound was confirmed by FT-IR, Raman, and solid 13 C-NMR spectroscopies. It was proved that the polymer is stable up to 300˚C and has a relatively high stability by the thermogravimetric analysis. It was also confirmed by the fluorescence spectrum that it has a strong blue fluorescence near 420 nm. The morphological characteristics of the polymer were further demonstrated by electron scanning electron microscopy (SEM).The properties of polymeric p-benzoyl-4,4'-diaminobenzoyl-aniline were found to emit strong blue fluorescence and have good thermal stability, making it a promising functional material for fluorescence in the blue region with potential for large-scale applications.

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Section: Nuclear Magnetic Resonance (Nmr) Carbon Spectrum Analysissupporting

confidence: 58%

Synthesis, Characterization and Properties of Polymeric p-Benzoyl-4,4'-Diaminobenzoylaniline

Mi,

Yuan,

Zhang

et al. 2023

MSCE

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“…It also implies that the BAHT-AA segment allowed the PTA and AA units to have the most appropriate and ordered arrangement on the PA66 backbone. ,, The chemical shifts in the carbon atoms in the HMDA unit at PA66/BAHT-AA and PA66/6T were slightly different in the 13 C NMR spectra shown in Figure . The signal i splits differently at 25.5–25.8 ppm, which corresponds to the A 1 A 1 BBA 1 A 1 , A 2 A 2 BBA 2 A 2 , and A 1 A 1 BBA 2 A 2 sequences present in the copolyamides. ,− This could prove very strongly that the regularity of PA66/BAHT-AA was higher than that of PA66/6T because only the aromatic moiety related sequence A 1 A 1 BBA 2 A 2 in the PA66/BAHT-AA backbone, while the 13 C NMR spectrum of PA66/6T showed that it may be a random copolyamide structure.…”

Section: Results and Discussionmentioning

confidence: 95%

New Strategy and Polymer Design to Synthesize Polyamide 66 (PA66) Copolymers with Aromatic Moieties from Recycled PET (rPET)

Chen

Ranganathan

Lee

et al. 2021

ACS Sustainable Chem. Eng.

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Recycling of poly(ethylene terephthalate) (PET) is considered to be a promising way to reduce environmental pollution. In this work, the valuable monomer bis(6-aminohexyl) terephthalamide (BAHT) comprising aromatic moieties was synthesized using recycled PET (rPET) waste by an aminolysis process. Five kinds of PA66 copolyamides with different contents of BAHT-AA salt (0−50 mol %, with a partially renewable content of 0−47.1 wt %) were successfully synthesized by the melt polycondensation method. The thermal and mechanical properties, crystallization kinetics, relaxation, and rheological behavior of these copolyamides were systematically investigated. The effect of BAHT-AA content on the resultant PA66 copolyamides properties was studied. The incorporation of BAHT-AA salt greatly improved the thermal and mechanical properties of the PA66 copolyamides compared to PA66/6T. This demonstrates that the monomer derived from the rPET can effectively endow a PA66 system with a well-distributed regulation of aromatic rings on its polymer backbones, with a rapid crystallization rate and high mechanical performance. Furthermore, the rPET-derived polyamides allow higher melt viscosity and exhibit a higher degree of shear-thin behavior, which is caused by the presence of more complex interaction in the polymer system. This discovery could provide a new concept for the PET waste treatment system, thus setting the stage for the recycling technique from rPET to polyamides.

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Exploring Oxidative NHC‐Catalysis as Organocatalytic Polymerization Strategy towards Polyamide Oligomers

Ragno

Brandolese

Carmine

et al. 2020

Chemistry A European J

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The polycondensation of diamines and dialdehydes promoted by an N‐heterocyclic carbene (NHC) catalyst in the presence of a quinone oxidant and hexafluoro‐2‐propanol (HFIP) is herein presented for the synthesis of oligomeric polyamides (PAs), which are obtained with a number‐average molecular weight (Mn) in the range of 1.7–3.6 kg mol−1 as determined by NMR analysis. In particular, the utilization of furanic dialdehyde monomers (2,5‐diformylfuran, DFF; 5,5’‐[oxybis(methylene)]bis[2‐furaldehyde], OBFA) to access known and previously unreported biobased PAs is illustrated. The synthesis of higher molecular weight PAs (poly(decamethylene terephthalamide, PA10T, Mn = 62.8 kg mol−1; poly(decamethylene 2,5‐furandicarboxylamide, PA10F, Mn = 6.5 kg mol−1) by a two‐step polycondensation approach is also described. The thermal properties (TGA and DSC analyses) of the synthesized PAs are reported.

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Quick analysis of composition of semi-aromatic copolyamide via ¹³C NMR study

Cited by 4 publications

References 25 publications

Synthesis, Characterization and Properties of Polymeric <i>p</i>-Benzoyl-4,4'-Diaminobenzoylaniline

Synthesis, Characterization and Properties of Polymeric <i>p</i>-Benzoyl-4,4'-Diaminobenzoylaniline

New Strategy and Polymer Design to Synthesize Polyamide 66 (PA66) Copolymers with Aromatic Moieties from Recycled PET (rPET)

Exploring Oxidative NHC‐Catalysis as Organocatalytic Polymerization Strategy towards Polyamide Oligomers

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Quick analysis of composition of semi-aromatic copolyamide via 13C NMR study

Cited by 4 publications

References 25 publications

Synthesis, Characterization and Properties of Polymeric &lt;i&gt;p&lt;/i&gt;-Benzoyl-4,4&#39;-Diaminobenzoylaniline

Synthesis, Characterization and Properties of Polymeric &lt;i&gt;p&lt;/i&gt;-Benzoyl-4,4&#39;-Diaminobenzoylaniline

New Strategy and Polymer Design to Synthesize Polyamide 66 (PA66) Copolymers with Aromatic Moieties from Recycled PET (rPET)

Exploring Oxidative NHC‐Catalysis as Organocatalytic Polymerization Strategy towards Polyamide Oligomers

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Quick analysis of composition of semi-aromatic copolyamide via ¹³C NMR study

Synthesis, Characterization and Properties of Polymeric <i>p</i>-Benzoyl-4,4'-Diaminobenzoylaniline

Synthesis, Characterization and Properties of Polymeric <i>p</i>-Benzoyl-4,4'-Diaminobenzoylaniline