Morphological, thermal, rheological, and mechanical properties of PP/EVOH blends compatibilized with PP‐<i>g</i>‐IA

Kim, Jung Soo; Jang, Ji Hoon; Kim, Jin Hoon; Lim, Dae Young; Lee, Youn Suk; Chang, Young Wook; Kim, Dong Hyun

doi:10.1002/pen.24357

Cited by 9 publications

(12 citation statements)

References 26 publications

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“…Thus, the appearance of both peaks for the polymers blended indicate that there are two phases that are immiscible but compatible. The results indicate that the addition of EVA on a PP matrix decreased the initial crystallinity of the PP phase from 34% to approximately 16% due to the introduction of a high amorphous polymer lowering the chemical potential of crystallization of both polymers [ 42 ], while for the PP/EVOH blends, the crystallinity is not significantly affected. DSC showed that the crystalline phases of the polymers are distinct and each polymer has an independent crystallization process [ 40 , 43 ].…”

Section: Resultsmentioning

confidence: 99%

“…It is well known in the literature that both blends are immiscible but compatible, forming a spherical dispersed phase in the polyolefin matrix (using the concentrations of PP and ethylene- and polar-monomer-based copolymer proposed in this research). This always occurred unless a compatibilizer is added where a co-continuous phase can be formed [ 35 , 42 , 46 , 47 ]. Comparing Figure 1 a,c, the micrographs clearly show three different morphologies: a co-continuous phase for the PP/EVA systems (regardless the content of VA), a spherical- shaped dispersed phase for PP/EVOH44 ( Figure 1 g) and a fibrillar shape dispersed phase for PP/EVOH38 ( Figure 1 e).…”

Section: Resultsmentioning

confidence: 99%

“…Contrary to what is typically reported in the literature, stiffness of the polymeric blends improved and the elongation at break remained the same [ 35 , 37 ]. In these kinds of systems, the modification of the stiffness and the elongation at break is mostly related with the polymeric blends (morphologies and polymer nature), rather than the effect of the MMT in the composite with the addition of the studied concentration of clay [ 8 , 16 , 17 , 42 ].…”

Section: Resultsmentioning

confidence: 99%

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Polypropylene/Ethylene—And Polar—Monomer-Based Copolymers/Montmorillonite Nanocomposites: Morphology, Mechanical Properties, and Oxygen Permeability

2021

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This research reports the influence of polar monomer contents in ethylene vinyl acetate copolymer (EVA) and ethylene vinyl alcohol copolymer (EVOH) on the morphology, mechanical and barrier properties of polypropylene/ethylene copolymer (PP) reinforced with organically modified montmorillonite (MMT). PP/EVA and PP/EVOH (75/25 wt %) blends were reinforced with 3 wt % MMT in an internal mixer system. Samples were compression-molded into films of 300μ μm. The structural characterization was made using X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM), the mechanical properties were obtained by tension tests and the barrier properties by oxygen transmission rate (OTR). XRD patterns showed a combination of intercalated/exfoliated morphologies for the MMT, with higher d-001 interplanar distance increments for the blends with higher content of polar functional groups. SEM and TEM micrographs complement the results of the XRD analysis and show differences in the morphologies depending on the miscibility of the polyolefin and the polar monomer copolymer. Mechanical properties and oxygen permeability of composites exhibited a higher improvement, by the addition of MMT, for higher intermolecular interactions and most miscible polymeric system of the EVA. These results show that the higher the number of interactions, given by the VA or OH polar functional groups, the morphology and the miscibility between polyolefin and copolymer imply dispersion improvements of the nanocomposites and, in consequence, a higher improvement on the mechanical and barrier properties of the composite material.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Polypropylene/Ethylene—And Polar—Monomer-Based Copolymers/Montmorillonite Nanocomposites: Morphology, Mechanical Properties, and Oxygen Permeability

2021

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“…As an important universal plastic, polypropylene (PP) has numerous applications in real life, such as containers, automobiles, nonwoven fabrics, construction, coverings, wires and cables, electronic and electric industry due to its versatility, high performance‐to‐cost ratio, easy processing, and excellent mechanical property . Unfortunately, when exposed to fire or heat source, the flammability and melt dripping problems of PP materials severely restrain its further application in more fields.…”

Section: Introductionmentioning

confidence: 99%

Synergistic effect of organically modified zinc aluminum layered double hydroxide in intumescent flame‐retarding polypropylene composites containing melamine phytate and dipentaerythritol

Zheng

Liu

Dai

et al. 2019

Polymer Engineering & Sci

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In this article, an organically modified zinc aluminum layered double hydroxide (OLDH) was prepared by a facile and effective method. The aim for preparing and decorating LDH is to improve the dispersion of OLDH particles in polypropylene (PP). Fourier transform infrared (FTIR) spectra and X‐ray diffraction (XRD) spectra have verified the feasibility for preparing OLDH. In contrast with LDH, the hydrophobicity of OLDH was obviously changed after introduction of sodium dodecyl benzene sulfonate. Together with melamine phytate/dipentaerythritol (MPA/DPER), OLDH was introduced into PP by melt blending. Surprisingly, the synergistic effect of OLDH and MPA/DPER was obviously found in flame‐retarding PP. When the content of MPA/DPER and OLDH are 27 phr and 3 phr, the limiting oxygen index value of PP composites is 30.5% and samples can pass UL‐94 V‐0 rating. Thermogravimetric analysis demonstrates that the participation of OLDH can further enhance the thermal stability of PP/MPA/DPER. Moreover, the surface morphology and chemical structure of PP composites after combustion were systematically analyzed by optical photos, SEM, FTIR spectra, and X‐ray photoelectron spectroscopy spectra, respectively. The results reveal that the reinforcing effect of OLDH for char layers structure becomes the main reason for improving the flame retardancy of PP composites. Based on abovementioned analysis, a potential synergistic flame retardant mechanism was primarily proposed. POLYM. ENG. SCI., 59:2301–2312, 2019. © 2019 Society of Plastics Engineers

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“…Lertwimolnun and Vergnes fabricated the PP/organoclay nanocomposites, in which system the PP grafted with maleic anhydride (PP‐ g ‐MA) was used to promote the clay distribution. Kim et al blended PP and ethylene vinyl alcohol (EVOH) with and without 10 wt% compatibilizer polypropylene grafted with itaconic acid (PP‐ g ‐IA), SEM pictures showed that PP and EVOH blended more uniformly with PP‐ g ‐IA than PP/EVOH blends without PP‐ g ‐IA, and there was no obvious “sea‐island” structure in the PP/EVOH/PP‐ g ‐IA blends. Bettini et al prepared PP/coir fiber (CF) composites, and incorporated PP‐ g ‐MA as compatibilizer, SEM micrographs indicated that PP and CF contacted closer with PP‐ g ‐MA than the blends PP/CF without PP‐ g ‐MA.…”

Section: Introductionmentioning

confidence: 99%

Toughened polyoxymethylene by polyolefin elastomer and glycidyl methacrylate grafted high‐density polyethylene

Yang

Wang

Yan

et al. 2017

Polymer Engineering & Sci

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Ternary blends of polyoxymethylene (POM), polyolefin elastomer (POE), and glycidyl methacrylate grafted high density polyethylene (GMA-g-HDPE) with various component ratios were studied for their mechanical and thermal properties. The size of POE dispersed phase increased with increasing the elastomer content due to the observed agglomeration. The notched impact strength demonstrated a parabolic tendency with increasing the elastomer content and reached the peak value of 10.81 kJ/m 2 when the elastomer addition was 7.5 wt%. The disappearance of epoxy functional groups in the POM/POE/GMA-g-HDPE blends indicated that GMA-g-HDPE reacted with the terminal hydroxyl groups of POM and formed a new graft copolymer. Higher thermal stability was observed in the modified POM. Both storage modulus and loss modulus decreased from dynamic mechanical analysis tests while the loss factor increased with increasing the elastomer content. GMA-g-HDPE showed good compatibility between the POM matrix and the POE dispersed phase due to the reactive compatibilization of the epoxy groups of GMA and the terminal hydroxyl groups of POM. A POM/POE blend without compatibilizer was researched for comparison, it was found that the properties of P-7.5(POM/POE 92.5 wt%/7.5 wt%) were worse than those of the blend with the GMA-g-HDPE compatibilizer.

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Morphological, thermal, rheological, and mechanical properties of PP/EVOH blends compatibilized with PP‐g‐IA

Cited by 9 publications

References 26 publications

Polypropylene/Ethylene—And Polar—Monomer-Based Copolymers/Montmorillonite Nanocomposites: Morphology, Mechanical Properties, and Oxygen Permeability

Polypropylene/Ethylene—And Polar—Monomer-Based Copolymers/Montmorillonite Nanocomposites: Morphology, Mechanical Properties, and Oxygen Permeability

Synergistic effect of organically modified zinc aluminum layered double hydroxide in intumescent flame‐retarding polypropylene composites containing melamine phytate and dipentaerythritol

Toughened polyoxymethylene by polyolefin elastomer and glycidyl methacrylate grafted high‐density polyethylene

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