IR spectra and structure of poly-p-phenyleneterephthalamide

Litovchenko, G. D.; Соколова, Т. С.; Volokhina, A. V.; Kudryavtsev, G. I.; Papkov, S. P.

doi:10.1007/bf00613892

Cited by 6 publications

(5 citation statements)

References 1 publication

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“…These absorption bands are characteristics for PPTA and are consistent with the previous literature. [37] In comparison with PPTA, the band of C O broadens to larger wavenumbers in the spectra of copolymerization samples, indicating the increased percentage of free and disordered H-bonds. The peak at 1,605 cm −1 is attributed to the respiratory vibration of benzene ring, which is weak due to the symmetrical alignment structure of PPTA and shows a shoulder peak near the C O band.…”

Section: Copolymerization Of Ppta With Different Comonomersmentioning

confidence: 98%

The bottom‐up synthesis for aramid nanofibers: The influence of copolymerization

Shi

Qiu

Tuo

2020

J of Applied Polymer Sci

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Aramid based on poly (p‐phenylene terephthalamide) (PPTA) is widely concerned as high‐performance materials. Herein, copolymerized aramid nanofibers (CANFs) were prepared for the first time by a direct bottom‐up polymerization method without additives. Three kinds of third monomers of m‐phenylenediamine, 4,4′‐diaminodiphenyl ether, and 2,5‐dichloro‐1,4‐phenylenediamine were separately copolymerized in PPTA and transformed into nanofiber dispersions in water medium. The characterization results revealed the relationship between the morphology of products and the structure as well as dosages of the different kinds of monomers, which was explained by the influence on conjugate regularities of the PPTA molecules. Furthermore, CANFs were used to build aramid paper blended in pure PPTA nanofibers, and the mechanical and insulation properties of composite paper were improved significantly, which would be of potential use as the new building block for aramid composite materials.

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Section: Copolymerization Of Ppta With Different Comonomersmentioning

confidence: 98%

The bottom‐up synthesis for aramid nanofibers: The influence of copolymerization

Shi

Qiu

Tuo

2020

J of Applied Polymer Sci

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“…These absorption bands are characteristic for PPTA and consistent with the previous literature. 33 There is an absorption band at 2872 cm À1 caused by the C-H stretching vibration of aliphatic hydrocarbon, indicating the copolymerization of mPEG with PPTA. The inset in Fig.…”

Section: Effects Of the Addition Of Mpegmentioning

confidence: 99%

A new approach to the preparation of poly(p-phenylene terephthalamide) nanofibers

Yan

Tian

et al. 2016

RSC Adv.

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“…2 The IR results are shown in Figure 4 (c reported. 25 The SEM results of the samples are shown in Figure 4 (d). The particle size of PPTA productis about dozens of micrometers, and the PPTA chain strips could be observed clearly.…”

Section: Please Do Not Adjust Marginsmentioning

confidence: 99%

“…The absorption band at 1640 cm À1 , which is called amide I band, is caused by the stretching vibration of C]O. Absorption bands at 1540 cm À1 and 1260 cm À1 , indicating amide II band and amide III band respectively, are caused by the deformation coupling vibrations of O]C-N and N-H. Again, these IR spectrum results are consistent with those has been reported. 25 The SEM results of the samples are shown in Fig. 4(d).…”

Section: Product Characterizationmentioning

confidence: 99%

Preparation of poly(p-phenylene terephthalamide) in a microstructured chemical system

Wang

Zhang

et al. 2015

RSC Adv.

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A microstructured chemical system, mainly including a micro-sieve mixer, a delay loop and a stirring tank, was designed to implement the polycondensation of p-phenylenediamine (PPD) and terephthaloyl chloride (TPC) for the preparation of poly(p-phenylene terephthalamide) (PPTA). A two-step method was exhibited, which consisted of fast conversion of more than 90% reactive groups in the delay loop and further chain growth in the stirring tank. This new polycondensation method had several advantages, such as continuous operation at higher temperature and out of pyridine, which made the process more controllable and environmentally friendly. PPTA particles with weight-average molecular weight (MW) from 4,000 to 16,000 were obtained at different synthesis conditions, and their structures were characterized by XRD, POM, IR, EA and SEM. The apparent reaction kinetics in the delay loop was also studied, which showed that the apparent activation energy was 12 kJ/mol with a pre-exponential factor of 5.4×10 3 L/(mol·s).

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IR spectra and structure of poly-p-phenyleneterephthalamide

Cited by 6 publications

References 1 publication

The bottom‐up synthesis for aramid nanofibers: The influence of copolymerization

The bottom‐up synthesis for aramid nanofibers: The influence of copolymerization

A new approach to the preparation of poly(p-phenylene terephthalamide) nanofibers

Preparation of poly(p-phenylene terephthalamide) in a microstructured chemical system

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