FTIR spectroscopic analysis of ion irradiated poly (ether ether ketone)

Lafi, Abdul G. Al

doi:10.1016/j.polymdegradstab.2014.04.005

Cited by 79 publications

(65 citation statements)

References 25 publications

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“…These two bands at 1305 and 1277 cm 21 are characteristics of amorphous PEEK and have been shown to be sensitive to changes in the molecular structure of PEEK. 22,27 As shown, these shifted to new position at 1320 and 1288 cm 21 upon sulfonation which suggests that there is a significant difference in the structure of the diphenyl ether segments in PEEK before and after sulfonation. The implication of this is that the sulfonation occurs preferably on the phenyl rings flanked with the two ether groups.…”

Section: 13mentioning

confidence: 79%

“…It is reduced in intensity and split to new bands at 795 and 726 cm 21 . It has been associated with the crystalline ordered structure of PEEK 27 and has been reported to decrease in intensity due to the proceeding of cross linking reaction in the aromatic ring 22,28 but it is reasonable here to attribute the reduction in this band as due to the increase in substitution levels. The 940 cm 21 band has been assigned to the aromatic CAH out of plane vibrations and has been observed only for molecules containing at least one complete PEEK repeating unit.…”

Section: The Band At 705 CMmentioning

confidence: 79%

“…29 The new weak band appears at 900-910 cm 21 increased with sulfonation and may arise from cyclic ether formed by the oxidation effects of concentrated sulfuric acid. 22,24 In summary, the most important changes which occur on sulfonation are listed in Table I along with their assignment based on whether the intensity increases (1ve) or decreases (2ve) after sulfonation.…”

Section: The Band At 705 CMmentioning

confidence: 99%

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The sulfonation of poly(ether ether ketone) as investigated by two‐dimensional FTIR correlation spectroscopy

Lafi

2014

J of Applied Polymer Sci

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Fourier transform infrared and two-dimensional correlation (2D-COS) spectroscopies were used to follow the structural alteration occurring upon sulfonation of poly(ether ether ketone), in concentrated sulfuric acid at room temperature. With the help of high resolution and high sensitivity 2D-COS, it was possible to locate the aromatic ring in which the substitution has taken place. Two new IR bands at 1288 and 1320 cm 21 were attributed to substitution occurring on the aromatic ring flanked with two ether groups. Limited oxidation effects of concentrated sulfuric acid manifested itself by the production of new carbonyl species absorbing in the IR at 1720 and 1750 cm 21 that were attributed to a fluorenone-type structure and to ester groups. The 2D-COS analysis showed that the band at 1470 cm 21 is not only due to the new substitution by sulfone groups and can not be used in the determination of sulfonation degree. Instead, the intensity of the 1490 cm 21 band, which can be attributed to skeletal ring vibration, was found to correlate well with the degree of sulfonation calculated from 1 H NMR spectroscopy. The infrared spectroscopy combined with 2D-COS provides a fast and powerful method for qualitative polymer structure verification and help to establish the quantitative analysis.

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Section: 13mentioning

confidence: 79%

Section: The Band At 705 CMmentioning

confidence: 79%

Section: The Band At 705 CMmentioning

confidence: 99%

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The sulfonation of poly(ether ether ketone) as investigated by two‐dimensional FTIR correlation spectroscopy

Lafi

2014

J of Applied Polymer Sci

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“…The strong bands at 1,231 cm -1 are due to the aromatic ether stretching vibration, and the absorption bands at 1,158 and 1,012 cm -1 are in-plane deformation bands of aromatic hydrogen. Moreover, the bisphenyl ketone band appears at 925 cm -1 , and the bands at 833 cm -1 are assigned to the para-substituted benzene ring [41]. Additionally, as shown in Fig.…”

Section: Synthesis and Characterizationmentioning

confidence: 79%

Synthesis, curing behavior, and thermal properties of fluorene-based benzoxazine-endcapped copoly(ether ketone ketone)s

Wang

Feng

et al. 2014

J Therm Anal Calorim

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A series of fluorene-based benzoxazine-endcapped copoly(ether ketone ketone)s (co-PEKKs) were successfully synthesized, in which the co-PEKKs were prepared with different molar ratios of 2,7-dihydroxy-9-fluorenone to bisphenol-A. The obtained phenol-ended coPEKKs reacted with formaldehyde and n-butylamine to yield the benzoxazine-endcapped co-PEKKs (B-PEKKs). The structure of these oligomers was studied by Fourier transform infrared spectroscopy and 1 H nuclear magnetic resonance spectroscopy, and the molecular mass of these phenol-ended co-PEKKs was detected by gel permeation chromatography. The thermal behaviors of these B-PEKKs were determined by differential scanning calorimetry. In addition, the thermal and dynamic mechanical properties of the polymer films were investigated by thermogravimetric analysis and dynamic mechanical analysis. The results indicate that the incorporation of co-PEKKs within the benzoxazine backbone considerably improves the toughness of the fluorene-containing polybenzoxazines without much sacrifice of their thermal properties. Furthermore, as the content of 2,7-dihydroxy-9-fluorenone increases, the T 5 values decrease, while the T g values and char yields of the prepared polymers increase to reach their highest values at 256°C and 64 %, respectively.

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“…, which associate with stretching vibrations of CAH and CAC groups [18]. There are a plenty of weak and overlapping absorption peaks around 1,450 cm 21 that can be attribute to the CAO stretching and OAH bending vibrations [19].…”

mentioning

confidence: 98%

Effect of SnO₂ and Sb-doped SnO₂ on the structure and electrical conductivity of epichlorohydrin rubber

Liu

Wang

et al. 2015

Polym. Compos.

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Nanosized Sb doped SnO 2 (ATO) particles were successfully synthesized. Electrically conducting rubbery composites based on epichlorohydrin rubber (ECO) and two kinds of conductive fillers (SnO 2 and ATO) were prepared by a conventional blending method. The morphology, structure and electrical conductivity of ECO/SnO 2 and ECO/ATO composites were investigated. Results showed that SnO 2 and ATO had great influence on the structure of ECO composite. Besides, the addition of oxide particles enhanced its electrical conductivity significantly. The electrical conductivity of ECO/ATO composite appeared an obvious threshold value with the variation of the loading amount of ATO fillers, whereas the resistivity of ECO filled with SnO 2 decreased monotonically with the increasing SnO 2 . The temperature dependence of resistivity indicated that the ECO/SnO 2 and ECO/ATO composites exhibited a negative temperature coefficient (NTC) effect. Scanning electron microscopy (SEM) was used to investigate the morphological states of oxide fillers in ECO matrix, and specifically continuous networks were observed. POLYM.

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FTIR spectroscopic analysis of ion irradiated poly (ether ether ketone)

Cited by 79 publications

References 25 publications

The sulfonation of poly(ether ether ketone) as investigated by two‐dimensional FTIR correlation spectroscopy

The sulfonation of poly(ether ether ketone) as investigated by two‐dimensional FTIR correlation spectroscopy

Synthesis, curing behavior, and thermal properties of fluorene-based benzoxazine-endcapped copoly(ether ketone ketone)s

Effect of SnO₂ and Sb-doped SnO₂ on the structure and electrical conductivity of epichlorohydrin rubber

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FTIR spectroscopic analysis of ion irradiated poly (ether ether ketone)

Cited by 79 publications

References 25 publications

The sulfonation of poly(ether ether ketone) as investigated by two‐dimensional FTIR correlation spectroscopy

The sulfonation of poly(ether ether ketone) as investigated by two‐dimensional FTIR correlation spectroscopy

Synthesis, curing behavior, and thermal properties of fluorene-based benzoxazine-endcapped copoly(ether ketone ketone)s

Effect of SnO2 and Sb-doped SnO2 on the structure and electrical conductivity of epichlorohydrin rubber

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Effect of SnO₂ and Sb-doped SnO₂ on the structure and electrical conductivity of epichlorohydrin rubber