Comparison of near-infrared and Raman spectroscopy for the determination of the density of polyethylene pellets

Kim, Minjung; Noh, Jaegeun; Chung, Hoeil

doi:10.1016/j.aca.2008.10.057

Cited by 20 publications

(25 citation statements)

References 18 publications

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“…Micro‐Raman spectra in the 1570–960 cm −1 range were obtained using a Jasco NRS‐2000C instrument with a microscope of 20× magnification. This spectral region has been widely used to infer structural information on PE28–33 and has been preferred for instrumental reasons to the low wavenumber range used by other authors for similar purposes 34–36. Actually, recent studies have demonstrated the usefulness of the Raman fingerprint region for the quantitative analysis of PE crystallinity 29, 31, 33…”

Section: Methodsmentioning

confidence: 99%

“…[34 -36] Actually, recent studies have demonstrated the usefulness of the Raman fingerprint region for the quantitative analysis of PE crystallinity. [29,31,33] All the spectra were recorded under back-scattering conditions with 5 cm −1 spectral resolution using the 488-nm line of an Ar laser (Innova Coherent 70) with a power of about 10 mW. The detector was a charge coupled device (CCD) from Princeton Instruments Inc. cooled to 160 K.…”

Section: Micro-raman Crystallinity Measurements On the Acetabular Cupsmentioning

confidence: 99%

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Raman characterisation of conventional and cross‐linked polyethylene in acetabular cups run on a hip joint simulator

Taddei

Foggia

Affatato

2011

J Raman Spectroscopy

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Five sets of differently sterilised conventional ultra-high molecular weight polyethylene (UHMWPE) and cross-linked polyethylene (XLPE) acetabular cups were run for 5 million cycles on a hip joint simulator in order to evaluate their wear behaviour in relation to material properties (PE grade, conventional or cross-linked) and sterilisation method (ethylene oxide (EtO) treatment or γ -irradiation). Gravimetric measurements revealed that conventional UHMWPE wore significantly more than XLPE. The differences in wear behaviour could be partly related to the orthorhombic contents obtained by Raman spectroscopy in the unworn areas of the cups: XLPE cups showed a significantly higher crystallinity degree than the UHMWPE specimens. Raman analysis showed that wear testing did not significantly modify the orthorhombic content of any of the tested acetabular cups. However, the set of cups that showed the highest weight loss, i.e. γ -sterilised PE GUR1020, appeared the most homogeneously polished upon wear testing; from a molecular point of view, only this set of cups showed a significant increase of the I 1130 /I 1060 intensity ratio, suggesting the occurrence of chain orientation. On the other hand, XLPE cups, despite the lowest weight loss undergone, showed a decrease in the amorphous content upon wear testing as well as a limited orthorhombic → monoclinic transformation, which did not appear detrimental.

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Section: Methodsmentioning

confidence: 99%

Section: Micro-raman Crystallinity Measurements On the Acetabular Cupsmentioning

confidence: 99%

Raman characterisation of conventional and cross‐linked polyethylene in acetabular cups run on a hip joint simulator

Taddei

Foggia

Affatato

2011

J Raman Spectroscopy

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show abstract

“…9 Kim et al compared near-infrared spectroscopy (NIR) and Raman spectroscopy in polyethylene pellet density measurements. 10 This study showed for most of the analyzed samples that Raman spectral features were more selective than those of NIR. The optimal models exhibited squared regression coefficient (R 2 ) of 0.995 and 0.997 for NIR and Raman, respectively.…”

Section: Introductionmentioning

confidence: 93%

“…[1][2][3] In the last decade, Raman applications have been developed to analyze polymers with chemometric methods that use changes in band position, intensities, width, and shape. These include applications such as determination of concentration, [4][5][6][7] identification, 8 and physical properties such as density, [9][10][11][12] Vicat temperature, Izod impact, and melt flow index (MFI). 13,14 Raman spectroscopy has been used to predict chemical and physical properties of polymers.…”

Section: Introductionmentioning

confidence: 99%

Linear and Nonlinear Calibration Methods for Predicting Mechanical Properties of Polypropylene Pellets Using Raman Spectroscopy

et al. 2016

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A nondestructive and faster methodology to quantify mechanical properties of polypropylene (PP) pellets, obtained from an industrial plant, was developed with Raman spectroscopy. Raman spectra data were obtained from several types of samples such as homopolymer PP, random ethylene-propylene copolymer, and impact ethylene-propylene copolymer. Multivariate calibration models were developed by relating the changes in the Raman spectra to mechanical properties determined by ASTM tests (Young's traction modulus, tensile strength at yield, elongation at yield on traction, and flexural modulus at 1% secant). Several strategies were evaluated to build robust models including the use of preprocessing methods (baseline correction, vector normalization, de-trending, and standard normal variate), selecting the best subset of wavelengths to model property response and discarding irrelevant variables by applying genetic algorithm (GA). Linear multivariable models were investigated such as partial least square regression (PLS) and PLS with genetic algorithm (GA-PLS) while nonlinear models were implemented with artificial neural network (ANN) preceded by GA (GA-ANN). The best multivariate calibration models were obtained when a combination of genetic algorithms and artificial neural network were used on Raman spectral data with relative standard errors (%RSE) from 0.17 to 0.41 for training and 0.42 to 0.88% validation data sets.

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“…The Raman assignments for the three layers and tie layer are listed in Table 1, according to the literature [13,21,23,25,[43][44][45][46][47][48]. In Table 1, most of peaks are assigned to skeletal CÀ ÀC bond of polymers, as this bond stretching vibration is strongly Raman active [22].…”

Section: Characterization Of Pe-film By Raman Spectroscopymentioning

confidence: 99%

Evaluation of multilayer film stability by Raman spectroscopy after gamma-irradiation sterilization process

Gaston

Dupuy

Marque

et al. 2018

Vibrational Spectroscopy

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Polymers such as polyethylene (PE) and ethylene vinyl alcohol (EVOH) are primary constituents of single use plastic systems in the biopharmaceutical and biotechnology industries. These devices are sterilized by gamma-irradiation prior to be used, the usual dose being between 25 and 45 kGy. Optical spectroscopies are of great interest for chemical analysis and are used to obtain information on the composition of materials such as polymers. Raman spectroscopy provides information on the fundamental vibrations of molecules, using excitation in the visible wavelength range. The purpose of this study is to unveil the impact of gamma-sterilization on polymers in industry-like experimental conditions. Cross-sections of films are analyzed before and after sterilization using different radiation doses: their compositions and chemical evolution of the material are examined using micro-Raman spectroscopy. As the chemical composition of the layers is complex, due to the presence of additive compounds, there is considerable overlap between the spectral data. In this case, the use of spectral curve resolution chemometric methods is unique for unravelling the complex identification of the layers and to study the degree of chemical modifications.

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Comparison of near-infrared and Raman spectroscopy for the determination of the density of polyethylene pellets

Cited by 20 publications

References 18 publications

Raman characterisation of conventional and cross‐linked polyethylene in acetabular cups run on a hip joint simulator

Raman characterisation of conventional and cross‐linked polyethylene in acetabular cups run on a hip joint simulator

Linear and Nonlinear Calibration Methods for Predicting Mechanical Properties of Polypropylene Pellets Using Raman Spectroscopy

Evaluation of multilayer film stability by Raman spectroscopy after gamma-irradiation sterilization process

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