Vibrational dynamics and heat capacity in syndiotactic poly(propylene) form II

Saxena, Vikal; Pathak, Ajita; Tandon, Poonam; Gupta, V. D.; Singh, Mahendra

doi:10.1016/j.polymer.2005.06.045

Cited by 6 publications

(2 citation statements)

References 32 publications

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“…Figure 5 shows the amplificatory bands of the region (1020–1060 cm −1 ) which is assigned to the SO stretching band [34–36], and the CC stretching band (side chain) of PP which is not influenced by temperature [37]. With the aid of computer analysis, curve‐fitting spectra of the SO stretching region were executed in the PP/CPP/PANI composite with various temperatures.…”

Section: Resultsmentioning

confidence: 99%

“…5. It shows that there are two Gaussian bands: the band, at about 1030 cm −1 , is attributed to the H‐bonded SO…HN stretching vibration; another band, at about 1038 cm −1 , is attributed to the so‐called free SO stretching vibration and the CC stretching band (side chain) of PP which is not influenced by temperature [37] and can be ignored in this article.…”

Section: Resultsmentioning

confidence: 99%

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In situ fourier‐transform infrared spectra analysis of hydrogen bond in polypropylene/chlorinated polypropylene/polyaniline composite

Yang

Zhang

Wang

et al. 2012

Polymer Engineering & Sci

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The previous studies suggest that hydrogen bond between chlorinated polypropylene (CPP) and polyaniline (PANI) plays a prominent role in the decision of polypropylene/CPP/PANI composites' electric property. In situ Fourier-transform infrared spectra were employed to detect and identify the relationship between the hydrogen bond and the temperature. Two kinds of hydrogen bond were carefully studied in the nitrogen-hydrogen bond (NÀ ÀH) stretching, sulfur-oxygen double bond (S¼ ¼O) stretching, and carbon-chlorine bond (CÀ ÀCl) stretching regions, using an iterative least-squares computer program to obtain the best fit of spectra. The ratio of absorptivity coefficients and the mole fraction of the ' 'free' ' and two kinds of Hbonded NÀ ÀH were calculated. There exists an apparent turning point in the curves of the relationship between the fraction of two kinds of H-bonded NÀ ÀH and temperature. This phenomenon also exists in the S¼ ¼O stretching region, and the turning point is at about 608C. The mole fraction of H-bonded CÀ ÀCl decreases, and that of ' 'free' ' CÀ ÀCl increases with increasing temperature. The enthalpy gap between the H-bonded NÀ ÀHÁ Á ÁO¼ ¼S and the H-bonded NÀ ÀHÁ Á ÁCl¼ ¼C dissociation was also obtained as 23.2 KJ/mol. POLYM. FIG. 7. FTIR CÀ ÀCl stretching vibrations of the PP/CPP/PANI composite at different temperatures. FIG. 6. The relationship between 1/X1 S¼ ¼O or1/XS1 S¼ ¼O and temperature in the S¼ ¼O stretching region. FIG. 11. The relationship between lnK d1 2 lnK d2 and T 21 for the enthalpy gap of the two kinds of H-bond dissociation.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

In situ fourier‐transform infrared spectra analysis of hydrogen bond in polypropylene/chlorinated polypropylene/polyaniline composite

Yang

Zhang

Wang

et al. 2012

Polymer Engineering & Sci

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Vibrational spectroscopic investigation of poly(p‐phenylene sulfide)

Kumar

Shukla

Tandon

et al. 2009

J Polym Sci B Polym Phys

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Poly(p‐phenylene sulfide) (PPS) is an important polymer of engineering interest particularly useful in the electronics and automotive industries. Normal mode analysis including phonon dispersion has been performed to understand completely the vibrational spectra of this polymer. Various characteristic features of the dispersion curves have been reported. Crossing/Repulsion between various pairs of modes at certain phase values have been explained as arising due to internal symmetry in the energy momentum space. The heat capacity is calculated as a function of temperature via density‐of‐states in the range 220–360 K. © 2009 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 47: 2353–2367, 2009

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