Characterization and microstructure study of low‐density polyethylene by Fourier transform infrared spectroscopy and temperature rising elution fractionation

Mahdavi, Hossein; Nook, Mojtaba Enayati

doi:10.1002/app.28398

Cited by 15 publications

(9 citation statements)

References 21 publications

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“…Methyl bending deformation can be observed at 1377 cm −1 . The methylene deformation shows an intensified peak at 1465 cm −1 . The symmetric and asymmetric stretching of CH 2 groups is observed at a broad peak between 2820 and 2980 cm −1 and a shoulder at 2664 cm −1 .…”

Section: Resultsmentioning

confidence: 96%

Investigating Thermal and Surface Properties of Low‐Density Polyethylene/Nanoperlite Nanocomposites for Packaging Applications

Heidari¹,

Davachi

Sahraeian

et al. 2018

Polymer Composites

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Nanocomposites films based on low‐density polyethylene (LDPE) and different compositions of treated and untreated nanoperlite were prepared via melt mixing of the ingredients on a corotating twin‐screw extruder and then film blowing the nanocomposites. The physical dispersion of the nanocomposites is confirmed using Fourier transform infrared‐attenuated total reflectance (FTIR‐ATR) method. According to the thermal studies, the nanocomposites with untreated nanoperlite showing higher melting temperature and crystallinity, while their thermal stability is lower than nanocomposites with treated nanoperlite. The thermal and FTIR‐ATR studies also revealed the ethylene absorption of the nanocomposites. According to the surface energy results, the treatment of the nanoparticles completely changes the surface behavior and hydrophobicity of the films. Finally, peel color index and field study observations showed that increase in nanoperlite will increase the shelf life of the fruits; however, the nanocomposite with 6% untreated nanoperlite is the best choice for the packaging applications. POLYM. COMPOS., 40:2929–2937, 2019. © 2018 Society of Plastics Engineers

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Section: Resultsmentioning

confidence: 96%

Investigating Thermal and Surface Properties of Low‐Density Polyethylene/Nanoperlite Nanocomposites for Packaging Applications

Heidari¹,

Davachi

Sahraeian

et al. 2018

Polymer Composites

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“…Infrared spectroscopy is a powerful technique for studying the microstructure and determining the short-chain branch distribution of polyethylene [24]. Figure 11 compares Fourier-transform (FTIR) spectra (in the wave number range of 1300–1425 cm −1 ) of copolymers obtained at 100 °C for nanosized and microsized catalysts.…”

Section: Resultsmentioning

confidence: 99%

Constrained Geometry Organotitanium Catalysts Supported on Nanosized Silica for Ethylene (co)Polymerization

2017

Molecules

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Supported olefin polymerization catalysts can prevent reactor-fouling problems and produce uniform polymer particles. Constrained geometry complexes (CGCs) have less sterically hindered active sites than bis-cyclopentadienyl metallocene catalysts. In the literature, micrometer-sized silica particles were used for supporting CGC catalysts, which might have strong mass transfer limitations. This study aims to improve the activity of supported CGC catalysts by using nanometer-sized silica. Ti[(C5Me4)SiMe2(NtBu)]Cl2, a “constrained-geometry” titanium catalyst, was supported on MAO-treated silicas (nano-sized and micro-sized) by an impregnation method. Ethylene homo-polymerization and co-polymerization with 1-octene were carried out in a temperature range of 80–120 °C using toluene as the solvent. Catalysts prepared and polymers produced were characterized. For both catalysts and for both reactions, the maximum activities occurred at 100 °C, which is significantly higher than that (60 °C) reported before for supported bis-cyclopentadienyl metallocene catalysts containing zirconium, and is lower than that (≥140 °C) used for unsupported Ti[(C5Me4)SiMe2(NtBu)]Me2 catalyst. Activities of nano-sized catalyst were 2.6 and 1.6 times those of micro-sized catalyst for homopolymerization and copolymerization, respectively. The former produced polymers with higher crystallinity and melting point than the latter. In addition, copolymer produced with nanosized catalyst contained more 1-octene than that produced with microsized catalyst.

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“…These differences are explained by characteristic properties of ethylene polymerization with different catalysts [23]. The coefficients of extinction are similar for these groups [27], therefore, the difference observed in band intensities describes their concentration in PE.…”

Section: Analysis Of Double Bonds Transformations At Pe Functionalizamentioning

confidence: 99%

Functionalization of LDPE and mLLDPE via grafting trans-ethylene-1,2-dicarboxylic acid by reactive extrusion

Krivoguz¹,

Guliyev²,

Песецкий³

2010

Express Polym. Lett.

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Abstract. An investigation was made of grafting trans-ethylene-1,2-dicarboxylic acid (TEDA) onto metallocene-linear low-density polyethylene (mLLDPE) and low-density polyethylene (LDPE) in the course of reactive extrusion. The initiator was 1,3-bis-(tert-butyl-peroxyisopropyl)benzene. The graft efficiency of TEDA has been shown to increase with increasing initiator concentration, irrespective of polyethylene type. The graft values for LDPE were higher than for mLLDPE over the initiator concentration range (0.05 to 0.4 wt%). The rheological properties of mLLDPE were found to undergo more tangible changes during functionalization than those of LDPE. These changes were caused by side reactions, mainly macromolecular crosslinking. It has been established that some carboxyl groups get transformed to anhydride groups in the grafted product. The concentration of end double bonds reduces, but intramolecular unsaturation in both polyethylenes increases. Data are presented on thermal and stress-strain (mechanical) properties of virgin and functionalized polymers, as well as rheological and viscoelastic properties of their melts.

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Characterization and microstructure study of low‐density polyethylene by Fourier transform infrared spectroscopy and temperature rising elution fractionation

Cited by 15 publications

References 21 publications

Investigating Thermal and Surface Properties of Low‐Density Polyethylene/Nanoperlite Nanocomposites for Packaging Applications

Investigating Thermal and Surface Properties of Low‐Density Polyethylene/Nanoperlite Nanocomposites for Packaging Applications

Constrained Geometry Organotitanium Catalysts Supported on Nanosized Silica for Ethylene (co)Polymerization

Functionalization of LDPE and mLLDPE via grafting trans-ethylene-1,2-dicarboxylic acid by reactive extrusion

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