The structure of PA-Se-S-Cd composite materials probed with FTIR spectroscopy

Krylova, Valentina; Dukštienė, Nijolė

doi:10.1016/j.apsusc.2018.11.121

Cited by 33 publications

(29 citation statements)

References 64 publications

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“…The absorption at 1463 cm –1 corresponds to the stretching vibration attributed to the CH 2 bond (–CH 2 scissoring) and the band at 720 cm −1 (–C–C rocking) refers to the stretching vibration of the carbon–carbon bond [ 49 ]. The polyamide spectrum presents bands of the ester group, C=O asymmetrical stretching of the imide group at 1738 cm −1 , amide I (C=O stretching) at 1637 cm –1 amide II (C–N stretching and N–H bending of hydrogen-bonded N–H groups at 1538 cm −1 [ 50 ]. The band at 3296 cm –1 is associated with hydrogen-bonded N–H stretching (amide A).…”

Section: Resultsmentioning

confidence: 99%

Polyethylene/Polyamide Blends Made of Waste with Compatibilizer: Processing, Morphology, Rheological and Thermo-Mechanical Behavior

et al. 2021

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The aim of this study was to develop a polyethylene/polyamide (R-PE/R-PA) regranulated product made from post-consumer wastes grafted with polyethylene-graft-maleic anhydride (PE-g-MAH) by reactive extrusion in a twin-screw extruder equipped with an external mixing zone. The compatibility effect of PE-g-MAH used as a modifier in R-PE/R-PA blends was evaluated by means of differential scanning calorimetry (DSC) and dynamic mechanical thermal analysis (DMTA), while the analysis of the chemical structure of this blend was carried out by Fourier transform infrared spectroscopy (FT-IR). The thermal properties, complex viscosity, and selected usage properties of R-PE/R-PA blends compatibilized with PE-g-MAH, i.e., density and water absorption, were evaluated. The morphology of the blends with and without the compatibilizer was observed by scanning electron microscopy. The R-PE/R-PA/MAH blend shows heterogenic structure, which is a result of the chemical reaction in reactive extrusion between functional groups of PE-g-MAH used as modifier and the end groups of R-PA6. The results show that the R-PE/R-PA blend with increased PE-g-MAH content showed increased hardness, stiffness, and ultimate tensile strength due to the increased degree of crystallinity. The increase in crystallinity is proportional to the improvement of the mechanical properties. Moreover, it is shown that 1 wt.% PE-g-MAH added to the R-PE/R-PA waste blend increases the interfacial interactions and compatibility between R-PE and R-PA, resulting in decreased polyamide particle size. Finally, the results show that it is possible to produce good quality regranulated products with advantageous properties and structure from immiscible polymer waste for industrial applications.

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Section: Resultsmentioning

confidence: 99%

Polyethylene/Polyamide Blends Made of Waste with Compatibilizer: Processing, Morphology, Rheological and Thermo-Mechanical Behavior

et al. 2021

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“…In addition, the band at 1164 cm −1 corresponds to CH 2 twisting, and the bands at 973 and 695 cm −1 are related to CO‐NH in plan vibration and CC bending, respectively. [ 59 ]…”

Section: Resultsmentioning

confidence: 99%

Effect of fly ash and coupling agent on the structural, morphological, thermal, and mechanical properties of polyamide 6/acrylonitrile‐butadiene‐styreneblend

et al. 2021

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In the present study, coal fly ash (FA) was used as a reinforcement in a thermoplastic matrix blend of polyamide 6/acrylonitrile‐butadiene‐styrene (PA/ABS). In the first part of this work, the as‐received FA (raw FA) was sieved with a 25 μm sieve to obtain FA with particle size less than 25 μm (FA). Then, the physicochemical properties of the raw FA and the FA were determined. Afterwards, FA was used to prepare a masterbatch of 20 wt% FA and 80 wt% PA by twin‐screw extrusion. Using this masterbatch, composites with different FA contents (4.5, 9, 14, and 18.5 wt%), with and without styrene‐(ethylene‐butylene)‐styrene grafted with maleic anhydride (SEBS‐g‐MA) (S‐g‐M), were produced by extrusion, which was followed by injection molding. Subsequently, several characterization techniques were performed to investigate the effect of FA loading and the S‐g‐M coupling agent on the structural, morphological, thermal, and mechanical properties of the developed composites. The results showed that incorporating FA particles in the matrix blend improved the thermal stability and crystallinity, the Young's modulus, the tensile strength, and torsional properties of the composites. In contrast, the addition of S‐g‐M coupling agent to the polymer composites improved the interfacial adhesion between FA particles and the matrix blend. This further enhanced the structural, morphological, thermal, and mechanical properties of the polymer composites. Overall, the use of FA as an inorganic filler improves the thermal and mechanical properties of polymer composites and shows a potential for promising applications.

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“…27 The FTIR spectra of CdS films deposited at different S1source is shown in figure 3(a). This FTIR spectrum also exhibits a weak absorption bands centered at ~800-950 cm -1 , ~1200 cm -1 and ~1376-1460 cm -1 , which correspond to the C-C stretching band 28 , C-CH bending 29 and sulphate S=O group, respectively. 30 The medium strong absorption bands observed at 1512 cm −1 can be assigned to N-H bending vibrations 31 , which suggest that there are still a few oleylamine ligands bonded with CdS after the washing process.…”

Section: Ftir Analysismentioning

confidence: 95%

Optical, structural and morphological study of CdS nanoparticles: role of sulfur source

Kamble¹,

Rondiya

Bade

et al. 2020

Nanomaterials and Energy

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Cadmium sulfide (CdS) nanoparticles were synthesized by simple and low cost homemade hot injection method at low process temperature using different sulphur sources. The effects of sulphur concentration on the structural, morphological, and optoelectronic properties of synthesized CdS films were studied using a range of characterization techniques: X-ray diffraction (XRD), Raman spectroscopy, field emission scanning electron microscopy (FESEM) and UV-Visible spectroscopy. The XRD studies revealed the formation of hexagonal type CdS nanoparticles. The varying morphology dependence on the sulphur source was ascertained from FESEM analysis. The longitudinal optical (LO) phonon vibrational modes of CdS were assigned in Raman spectra at 300 and 600 cm-1. The band gap of the CdS particles was estimated to be 2.30 eV from Tauc's plots. Consistent with the experimental results, our first-principles DFT calculations predict the band gap of CdS nanoparticles to increase with decreasing S concentration: Cd 52 S 52 (2.38 eV) Cd 52 S 51 (2.52 eV) and Cd 52 S 50 (2.65 eV), with both the valence and conduction band edges demonstrated to be dominated by S-p states.

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The structure of PA-Se-S-Cd composite materials probed with FTIR spectroscopy

Cited by 33 publications

References 64 publications

Polyethylene/Polyamide Blends Made of Waste with Compatibilizer: Processing, Morphology, Rheological and Thermo-Mechanical Behavior

Polyethylene/Polyamide Blends Made of Waste with Compatibilizer: Processing, Morphology, Rheological and Thermo-Mechanical Behavior

Effect of fly ash and coupling agent on the structural, morphological, thermal, and mechanical properties of polyamide 6/acrylonitrile‐butadiene‐styreneblend

Optical, structural and morphological study of CdS nanoparticles: role of sulfur source

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