Estimation of crystallinity of isotactic polypropylene using Raman spectroscopy

Nielsen, A. S.; Batchelder, D. N.; Pyrz, Ryszard

doi:10.1016/s0032-3861(02)00053-8

Cited by 207 publications

(229 citation statements)

References 31 publications

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“…For example, the Raman lines located at 1152, 1034, 900, and 841 cm -1 in molten isotactic and sindiotactic polypropylene are coincident or almost coincident. [17][18][19] As expected, some other Raman lines are characteristic either to the sindiotactic or isotactic addition of monomers. 17 Pristine polymers such as iPP show no ESR spectra.…”

Section: Introductionsupporting

confidence: 80%

“…It is important to notice that the contributions of iPP are expected to dominate the Raman spectra characterized by shifts smaller than 1200 cm -1 . 19,25 The Raman spectra in the range 1100-2800 cm -1 have been simulated by a convolution of up to 11 symmetric Lorentzian lines. Figure 1(C) demonstrates the good agreement between the fitted spectrum (black and narrow line) and the as-recorded spectrum (gray and broad line).…”

Section: Resultsmentioning

confidence: 99%

“…As observed from Figure 2(A), the absence of a very strong Raman line lo- cated at 850 cm -1 rules-out the possibility of sindiotactic-like structures. 18,19 The degree of crystallinity of iPP may be inferred from Raman spectra within a threephase model 19 that implies a crystalline phase responsible for the Raman line located at 808 cm -1 , a defected phase containing mostly helical chains identified by the Raman line located at 840 cm -1 , and a melt-like structure assigned to amorphous polypropylene and assigned to the line noticed at 830 cm -1 . 19 As noticed from Figure 3 (bottom spectrum), the as-recorded Raman lines were observed at slightly higher Raman shifts.…”

Section: Resultsmentioning

confidence: 99%

“…18,19 The analysis of Raman spectra of polypropylene is complicated by the fact that in most cases A and E modes are mixed. 18,19 Certain Raman modes are not significantly affected by the configuration and conformation of macromolecular chains. For example, the Raman lines located at 1152, 1034, 900, and 841 cm -1 in molten isotactic and sindiotactic polypropylene are coincident or almost coincident.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Spectroscopic investigations on polypropylene‐carbon nanofiber composites. I. Raman and electron spin resonance spectroscopy

Chipara¹,

Villarreal²,

Chipara³

et al. 2009

J Polym Sci B Polym Phys

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Isotactic polypropylene‐vapor grown carbon nanofiber composites containing various fractions of carbon nanofibers, ranging from 0 to 20 wt %, have been prepared. Raman spectroscopy was used to analyze the effect of the dispersion of carbon nanofibers within polypropylene and the interactions between carbon nanofibers and macromolecular chains. The as‐recorded Raman spectra have been successfully fitted by a linear convolution of Lorentzian lines. Changes of the Raman lines parameters (position, intensity, width, and area) of polypropylene and carbon nanofibers were analyzed in detail. The Raman spectra of the polymeric matrix—at low concentrations of nanofibers—show important modifications that indicate strong interactions between carbon nanofibers and the polymeric matrix reflecting by vibrational dephasing of macromolecular chains. The Raman spectrum of carbon nanofibers is sensitive to the loading with carbon nanofibers, showing changes of the resonance frequencies, amplitudes, and width for both D‐ and G‐bands. Raman data reveals the increase of the disorder, as the concentration of carbon nanofibers is increased. The presence of the typical ESR line assigned to conducting electrons delocalized over carbon nanofibers is confirmed and the presence of a spurious magnetic line due to catalyst's residues is reported. © 2009 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 47: 1644–1652, 2009

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Section: Introductionsupporting

confidence: 80%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Spectroscopic investigations on polypropylene‐carbon nanofiber composites. I. Raman and electron spin resonance spectroscopy

Chipara¹,

Villarreal²,

Chipara³

et al. 2009

J Polym Sci B Polym Phys

View full text Add to dashboard Cite

show abstract

“…Spectra are corrected by the instrumental function recorded with a calibrated white source and a CaF 2 pellet. For intensity measurements, Raman spectra are normalized using the total intensity of the C-H rocking vibrations [12]. The EPR measurements were done with a Bruker ER200D spectrometer operating in the X-band and calibrated with a DPPH standard.…”

Section: Methodsmentioning

confidence: 99%

Boosting TiO2-anatase antimicrobial activity: Polymer-oxide thin films

Kubacka

Ferrer

Cerrada

et al. 2009

Applied Catalysis B: Environmental

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Raman Spectroscopy of Polymers

Paradkar

Leugers

Patel

et al. 2009

Encyclopedia of Analytical Chemistry

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Raman spectroscopy is a vibrational spectroscopic technique that can provide detailed information about reaction chemistry, structure, chemical composition, and morphology of the chemical species under investigation. Owing to its ease of sampling, Raman spectroscopy is particularly well suited for in situ monitoring and to study polymers and solid samples that are less amenable to other analytical techniques. Polymer powers, pellets, molded articles, fibers, and films can be probed by simply illuminating them with a laser beam and analyzing the backscattered radiation. The primary goal of this article is to provide potential Raman practitioners a high level overview of the technique and instrumentation and different types of polymer‐related applications using some real‐world examples. These applications will generally take advantage of the sampling ease or unique structural information available from Raman spectroscopy. It is not our intention to discuss the theory or present an exhaustive review of the existing Raman literature in any detail. Instead a comprehensive list of references is provided for readers interested in acquiring additional information on specific topics.

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Estimation of crystallinity of isotactic polypropylene using Raman spectroscopy

Cited by 207 publications

References 31 publications

Spectroscopic investigations on polypropylene‐carbon nanofiber composites. I. Raman and electron spin resonance spectroscopy

Spectroscopic investigations on polypropylene‐carbon nanofiber composites. I. Raman and electron spin resonance spectroscopy

Boosting TiO2-anatase antimicrobial activity: Polymer-oxide thin films

Raman Spectroscopy of Polymers

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