Prediction of polyethylene density from FTIR and Raman spectroscopy using multivariate data analysis

Bredács, Márton; Barretta, Chiara; Castillon, Luis F.; Frank, Andreas; Pinter, Gerald; Gergely, Szilveszter

doi:10.1016/j.polymertesting.2021.107406

Cited by 40 publications

(16 citation statements)

References 36 publications

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“…In addition, weak bands located at 1250 and 1160 cm −1 , as well as at 1367 and 1135 cm −1 , appeared due to the asymmetric and symmetric bending vibration of the CH group and to CH 2 wagging and CH 2 twisting vibrations, respectively [ 28 ]. The FTIR spectra of β-CD and d -limonene have been already shown by the authors in their previous paper [ 20 ] and, in order not to overburden the spectra, they are reported in Figure S1a,b of the Supplementary Materials .…”

Section: Resultsmentioning

confidence: 99%

Thermal and Morphological Analysis of Linear Low-Density Polyethylene Composites Containing d-limonene/β-cyclodextrin for Active Food Packaging

et al. 2023

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Composites made of linear low-density polyethylene (LLDPE) and β-cyclodextrin/<font style="font-variant: small-caps">d</font>-limonene inclusion complex (CD-lim) were prepared by melt extrusion to develop a novel food packaging material. Scanning electron microscopy evidenced a fairly good dispersion of the filler within the polymeric matrix. Infrared spectroscopy coupled with thermogravimetric analysis confirmed the presence of CD-lim in the composites, proving that the applied technology of including the essential oil within β-CD cages allows for preventing a sizable loss of <font style="font-variant: small-caps">d</font>-limonene despite a high temperature and shear applied upon extrusion processing. Moreover, the influence of the filler on the thermal properties of PE was assessed. It was found that the cyclodextrin-based inclusion complex significantly fastens the crystallization path of the polyethylene matrix with an improved crystallization rate of the PE/CD-lim composites compared to the neat polymer.

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Section: Resultsmentioning

confidence: 99%

Thermal and Morphological Analysis of Linear Low-Density Polyethylene Composites Containing d-limonene/β-cyclodextrin for Active Food Packaging

et al. 2023

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“…Compared to raw Al, the additional peaks at 2950 and 2880 cm −1 in modified Al correspond to the CH stretching vibration. Meanwhile, the additional peak at 1460 and 1130 cm −1 corresponds to the CH bending vibration and the SiOH vibration, [ 11 ] respectively, demonstrating the successful grafting of DTS on Al surface. [ 12 ] With the increase of the DTS grafting density from 0.13 to 0.29 molecule nm −2 , the intensity of the above peaks shows a distinct enhancement which lays a verification for precise regulation of the surface chemistry.…”

Section: Resultsmentioning

confidence: 99%

Modulating Surface Chemistry of Al Powders for Elastomeric Composites with Applications in Electronic Cooling

Zhang

Ren

et al. 2023

Adv Materials Inter

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are generated, the intervention of thermal management via thermal interface materials (TIM) is much required in order to prolong working life and increase reliability. [2] Elastomeric composites are widely used as thermal interface materials in electronics due to their flexibly deform under an applied load and further exhibit elastic recovery. [3] Among them, silicone pads, available in solid soft matter, provide low component stress, rework simplicity, process flexibility, in-application stability, and efficient thermal conductivity. [4] Silicone pads can be prepared by preform and curing or by dispensing silicone gels that, once dispensed, hold their shape and are ideal for applications where high gap stability is required. [5] Upon cure, the silicone pads provide a soft, thermally conductive material capable of reducing air voids and gaps with the capability to withstand warpage. Therefore, mechanical and thermal properties are important indicators for assessing the performance of silicone pads. The crosslinking and entanglement of polymer chains endow elastomers with good mechanical properties, [6] but the irregular chain arrangement also introduces countless interfacial thermal resistance and hinders the heat transfer. [7] Thermal conductivity of bulk elastomers is normally lower than 0.3 W mK −1 . [8] Hence, fillers with high thermal conductivity are added to the elastomers in order to enhance the heat transfer ability while damaging the mechanical performance. In commercial silicone pads, high content (>80 wt%) of aluminum, alumina, zinc oxide, or their combinations are used to build up thermally conductive networks within the composites. In this case, the optimization of the mechanical performance of elastomeric composites is mainly dependent on silicone matrix and filler-matrix interface. The technical scope for modulation by varying the molecular structure of the silicone matrix is limited. [9] Therefore, modulating the surface chemistry of fillers to ameliorate the interface is the main strategy to solve the challenge. [10] In our previous study, [4c] we have modified Al via silane coupling agents with varied chain lengths and explored the corresponding effect on the overall performance. The results indicated the grafting of dodecyltrimethoxysilane (DTS) led to the strongest interface bonding between Al and silicone matrix. However, the deeper effect of different DTS grafting densities Elastomeric composites are an important class of thermal interface materials as they are shape-adaptive, which can fit uneven interfaces and achieve ideal interfacial heat transfer in electronic cooling. There is often a trade-off between mechanical and thermal performances in highly filled composites. Here, the surface chemistry of Al powders via introducing dodecyltrimethoxysilane (DTS) upon different grafting densities is precisely controlled. The results show that the DTS grafting density of 0.24 molecule nm −2 endows the composites with optimized mechanical properties. The tensile stress, elongation at break, a...

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“…The most intensive peaks are 1291 cm − 1 (CH 2 twisting mode), 1127 cm − 1 (symmetric C-C stretching mode) and 1060 cm − 1 (the anti-symmetric C-C stretching mode) [45]. Three distinct peaks around 1400 cm − 1 are assigned to the CH 2 bending modes, while the peaks at 2838 and 2871 cm − 1 are assigned to the symmetric and asymmetric CH 2 stretching modes, respectively [46]. The SERS signal from the PE spheres was difficult to obtain.…”

Section: Raman and Sers Measurements 321 Detection Of Polystyrenementioning

confidence: 99%

Surface-enhanced Raman spectroscopy for the detection of microplastics

Mikac

Rigó

Himics

et al. 2023

Applied Surface Science

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Prediction of polyethylene density from FTIR and Raman spectroscopy using multivariate data analysis

Cited by 40 publications

References 36 publications

Thermal and Morphological Analysis of Linear Low-Density Polyethylene Composites Containing d-limonene/β-cyclodextrin for Active Food Packaging

Thermal and Morphological Analysis of Linear Low-Density Polyethylene Composites Containing d-limonene/β-cyclodextrin for Active Food Packaging

Modulating Surface Chemistry of Al Powders for Elastomeric Composites with Applications in Electronic Cooling

Surface-enhanced Raman spectroscopy for the detection of microplastics

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