Microstructural characterization of semicrystalline copolymers by Raman spectroscopy

Tomba, J. Pablo; Mana, Carla D.; Pérez, Claudio Javier; Desimone, Paula Mariela; Galland, Griselda B.

doi:10.1016/j.polymertesting.2016.04.001

Cited by 8 publications

(5 citation statements)

References 24 publications

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“…The Raman analysis for crystalline and amorphous phases in iPP is usually focused in the region at 780-880 cm −1 [2,11,[24][25][26][37][38][39][40][42][43][44][45][46], that mostly correlate with CH 2 rocking, and some C-C stretching. The peak at 809 cm −1 is associated to CH 2 rocking, entangled with the skeletical mode of symmetric stretching.…”

Section: Isotactic Propylene Copolymersmentioning

confidence: 99%

“…Raman spectroscopy is a fast and nondestructive method to probe the conformational states of the polymer chains. Thus, differentiation in the vibrational spectrum of chains in crystals with unique conformations must be expected [1,2,[20][21][22][23][24][25][26][27][28][29][30][33][34][35][36][37][38][39][40][41][42][43][44][45][46]. Contents of different configurational and conformational states, order and length distribution of sequences can be potentially identified and related to chains in specific 'phases' [37][38][39].…”

Section: Introductionmentioning

confidence: 99%

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Morphological Raman analysis of short chain branched ethylene and propylene metallocenic copolymers

et al. 2018

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Section: Isotactic Propylene Copolymersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Morphological Raman analysis of short chain branched ethylene and propylene metallocenic copolymers

et al. 2018

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“…Finally, it is important to mention that Raman spectroscopy is well known to be able to discriminate between copolymers with close chemical structures 32 , 33 . Therefore, the analysis of samples with more complex compositions than what was used in this work is possible using the proposed approach as long as the following conditions are met.…”

Section: Resultsmentioning

confidence: 99%

Studying the concentration of polymers in blended microplastics using 2D and 3D Raman mapping

Choobbari

Ferguson

Brande

et al. 2023

Sci Rep

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The combination of different polymers in the form of blended plastics has been used in the plastic industry for a long time. Nevertheless, analyses of microplastics (MPs) have been mainly limited to the study of particles made of single-type polymers. Accordingly, two members of the Polyolefins (POs) family, i.e., Polypropylene (PP) and Low-density Polyethylene (LDPE) are blended and extensively studied in this work due to their applications in industry as well as abundance in the environment. It is shown that 2-D Raman mapping only provides information about the surface of blended MPs (B-MPs). While complimentary 3-D volume analysis is needed to fully understand the presence of various polymers in such complex samples. Therefore, 3-D Raman mapping is applied to visualize the morphology of the distribution of polymers within the B-MPs together with the quantitative estimation of their concentrations. A parameter defined as the concentration estimate error (CEE) evaluates the precision of the quantitative analysis. Furthermore, the impact of four excitation wavelengths 405, 532, 633, and 785 nm is investigated on the obtained results. Finally, the application of a line-shaped laser beam profile (line-focus) is introduced for reducing the measurement time from 56 to 2 h.

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“…The Raman spectroscopic analysis showed representative distinct spectrum profiles belonging to the different polymers presented in Figure 2. PE polymers had four major peaks in the Raman fingerprint region, namely the peaks corresponding to the C=C backbone stretching at 1118-1200 cm −1 , CH 2 twisting at 1288 cm −1 , CH 2 bending mode at around 1432-1450 cm −1 and CH 2 symmetric and antisymmetric stretching 2870-2950 cm −1 [61]. PVB exhibits stretching at 2850 to 3000 cm −1 (-CH, -CH 2 stretching), 1720 cm −1 (C=O stretching), 1420 to 1500 cm −1 (CH 2 bending), and 1250 to 1350 cm −1 (C-O-C stretching).…”

Section: Identification and Quantification Of Mp Particles In Biota S...mentioning

confidence: 99%

Screening of Microplastics in Aquaculture Systems (Fish, Mussel, and Water Samples) by FTIR, Scanning Electron Microscopy–Energy Dispersive Spectroscopy and Micro-Raman Spectroscopies

Miserli,

Lykos,

Kalampounias

et al. 2023

Applied Sciences

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In the last decade, plastic waste has become one of the main threats to marine ecosystems and their biodiversity due to its abundance and increased persistence. Microplastics can be classified as either primary, i.e., fabricated for commercial use, or secondary, i.e., resulting from the fragmentation/weathering processes of larger plastic pieces in the environment. In general, microplastics are detected in a number of aquatic organisms (e.g., fish, bivalves, mollusks, etc.) with alarming effects on their health. Therefore, the present work focuses on the detection and identification of microplastics in fish species (Dicentrarchus labrax, Sparus aurata) and mussels (Mytilus galloprovincialis) from aquaculture systems since these aquatic organisms are largely commercially available for consumption. In addition, seawater was also screened for the types of polymers present as well as their aging. The experimental protocol for biota samples contains a digestion step using Fenton’s reagent (0.05 M FeSO4⋅7H2O with 30% H2O2 at a volume ratio of 1:1) to remove organic material followed by filtration and a density separation step where the sample material was mixed with a saturated ZnCl2 solution to separate microplastic particles from heavier material. For seawater samples (sampled by a microplastic net sampler), only sieving on stainless steel sieves followed by filtration on silica filters was applied. Detection of microplastics and identification of their polymeric composition was achieved through the combined use of micro-Raman analysis, Attenuated Total Reflectance–Fourier Transform Infrared spectroscopy, and Scanning Electron Microscopy in tandem with Energy Dispersive X-ray spectroscopy. Microplastic abundance was 16 ± 1.7 items/individual in mussels and 22 ± 2.1 items/individual in sea bass, and 40 ± 3.9 items/individual in sea bream, with polyethylene (74.4%) being the most detected polymer type, while polyethylene-co-vinyl acetate (65%), polyvinyl-butyral (36.8%), polyvinyl alcohol (20%), and polybutyl methacrylate (15.8%) were also detected to a lesser extent. The microplastics isolated from seawater samples were films (30%), fragments (30%), and fibers (20%), while some of them were derived from foams (20%). Also, in most of these seawater-recovered microplastics, a relatively high degree of oxidation (carbonyl index > 0.31) was observed, which was further confirmed by the results of Energy Dispersive X-ray spectroscopy. Finally, the Scanning Electron Microscopy images showed various morphological characteristics (cracks, cavities, and burrs) on the surfaces of the microplastics, which were attributed to environmental exposure.

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Microstructural characterization of semicrystalline copolymers by Raman spectroscopy

Cited by 8 publications

References 24 publications

Morphological Raman analysis of short chain branched ethylene and propylene metallocenic copolymers

Morphological Raman analysis of short chain branched ethylene and propylene metallocenic copolymers

Studying the concentration of polymers in blended microplastics using 2D and 3D Raman mapping

Screening of Microplastics in Aquaculture Systems (Fish, Mussel, and Water Samples) by FTIR, Scanning Electron Microscopy–Energy Dispersive Spectroscopy and Micro-Raman Spectroscopies

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