Isotacticity determination of polypropylene using FT-Raman spectroscopy

Sundell, Tom; Fagerholm, Heidi M.; Crozier, Hervé

doi:10.1016/0032-3861(96)88466-7

Cited by 43 publications

(33 citation statements)

References 6 publications

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“…The regularity of the polymer chains developed during polymerization using different EDs and hydrogen feed is characterized by the isotacticity and by the regular iPP sequence length. The isotacticity of the polymers was characterized by IR measurements, using the intensity ratio of bands at 998 and 973 cm -1 , which ratio is proportional to isotacticity [36]. The results are given in Table 4 indicating that the isotacticity of the samples varies in a wide range.…”

Section: Results and Discussion 31 Molecular Architecturementioning

confidence: 99%

See 1 more Smart Citation

Direct correlation between modulus and the crystalline structure in isotactic polypropylene

Menyhárd

Suba²,

Laszlo³

et al. 2015

Express Polym. Lett.

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Section: Results and Discussion 31 Molecular Architecturementioning

confidence: 99%

“…The spectra were recorded using a Mattson Galaxy 3020 apparatus (Unicam, England) in the wavelength range of 4000 and 400 cm -1 . Determination of isotacticity was carried out based on the work of Sundell et al [36]. Mechanical properties were characterized by tensile testing using an Instron 5566 apparatus (Instron, Germany).…”

Section: Experimental Techniquesmentioning

confidence: 99%

Direct correlation between modulus and the crystalline structure in isotactic polypropylene

Menyhárd

Suba²,

Laszlo³

et al. 2015

Express Polym. Lett.

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“…However, in the case of PE pellet samples, NIR and Raman spectroscopy give very similar results for the prediction of the density. 36 Thus, probably, the two spectroscopic techniques accentuate different features in the different polymers. Further studies are needed for the comparison of the potential of nondestructive analysis tools between NIR and Raman spectroscopy.…”

Section: Comparison Between Nir and Raman Spectroscopymentioning

confidence: 99%

Discrimination of various poly(propylene) copolymers and prediction of their ethylene content by near‐infrared and Raman spectroscopy in combination with chemometric methods

Furukawa

Watari

Siesler

et al. 2002

J of Applied Polymer Sci

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Near-infrared (NIR) diffuse reflectance (DR) spectra and Fourier-transform (FT) Raman spectra were measured for 12 kinds of block and random poly(propylene) (PP) copolymers with different ethylene content in pellets and powder states to propose calibration models that predict the ethylene content in PP and to deepen the understanding of the NIR and Raman spectra of PP. Band assignments were proposed based calculation of the second derivatives of the original spectra, analysis of loadings and regression coefficient plots of principal component analysis (PCA) and principal component regression (PCR) (predicting the ethylene content) models, and comparison of the NIR and Raman spectra of PP with those of linear low-density polyethylene (LLDPE) with short branches. PCR and partial least squares (PLS) regression were applied to the second derivatives of the NIR spectra and the NIR spectra after multiplicative scatter correction (MSC) to develop the calibration models. After MSC treatment, the original spectra yield slightly better results for the standard error of prediction (SEP) than the second derivatives. A plot of regression coefficients for the PCR model shows peaks due to the CH 2 groups pointing upwards and those arising from the CH 3 groups pointing downwards, clearly separating the bands due to CH 3 and CH 2 groups. For the Raman data, MSC and normalization were applied to the original spectra, and then PCR and PLS regression were carried out to build the models. The PLS regression for the normalized spectra yields the best results for the correlation coefficient and the SEP. Raman bands at 1438, 1296, and 1164 cm Ϫ1 play key roles in the prediction of the ethylene content in PP. The NIR chemometric evaluation of the data gave better results than those derived from the Raman spectra and chemometric analysis. Possible reasons for this observation are discussed.

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“…This phenomenon is possibly due to the fact that the surface of the C D composite exhibits more cellulosic fibre characteristic than C ND composite [27]. The literature [28,29] reports that the volume crystallinity index is proportional to A 841 /A 973 ratio where A 973 is the absorbance peak intensity at 973 cm -1 that is insensitive to the amorphous/crystalline ratio of isotactic polypropylene whereas A 841 is the intensity of the band at 841 cm -1 linked to crystallinity content. For the neat matrix and the two composites this ratio is close and thus the crystallinity rate too.…”

Section: The Compositesmentioning

confidence: 99%

Mechanical and dielectric characterization of hemp fibre reinforced polypropylene (HFRPP) by dry impregnation process

Kechaou¹,

Salvia²,

Beaugiraud³

et al. 2010

Express Polym. Lett.

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Abstract. Natural fibres such as jute, coir, sisal, bamboo and pineapple are known to have high specific strength and can be effectively used in composites in various applications. The use of hemp fibres to reinforce the polymer aroused great interest and expectations amongst scientists and materials engineers. In this paper, composites with isotactic polypropylene (iPP) matrix and hemp fibres were studied. These materials were manufactured via the patented FIBROLINE process based on the principle of the dry impregnation of a fibre assembly with a thermoplastic powder (iPP), using an alternating electric field. The aim of this paper is to show the influence of fibre/matrix interfaces on dielectric properties coupled with mechanical behaviours. Fibres or more probably the fibre/matrix interfaces allow the diffusion of electric charges and delocalise the polarisation energy. In this way, damages are limited during mechanical loading and the mechanical properties of the composites increase. The structure of composite samples was investigated by X-ray and FTIR analysis. The mechanical properties were analysed by quasistatic and dynamic tests. The dielectric investigations were carried out using the SEMME (Scanning Electron Microscope Mirror Effect) method coupled with the measurement of the induced current (ICM).

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Isotacticity determination of polypropylene using FT-Raman spectroscopy

Cited by 43 publications

References 6 publications

Direct correlation between modulus and the crystalline structure in isotactic polypropylene

Direct correlation between modulus and the crystalline structure in isotactic polypropylene

Discrimination of various poly(propylene) copolymers and prediction of their ethylene content by near‐infrared and Raman spectroscopy in combination with chemometric methods

Mechanical and dielectric characterization of hemp fibre reinforced polypropylene (HFRPP) by dry impregnation process

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