Controlling MWCNT partitioning and electrical conductivity in melt compounded polypropylene/poly(ethylene- co -octene) blends

Petrie, Kyle; Osazuwa, Osayuki; Docoslis, Aristides; Kontopoulou, Marianna

doi:10.1016/j.polymer.2017.02.087

Cited by 12 publications

(7 citation statements)

References 43 publications

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“…The enhancement in moduli and toughness values of the prepared TPO (LPPE/EPDM/MWCNTs-COOH) could be attributed to the enhancing effect correlated to the interfacial interaction between the functionalized MWCNTs and TPO through its coupling agent (MPE). One reason for such enhancement is attributed to π-π interaction between the unsaturation units in the EPDM part and the nanotubes [29]. Besides, enhancing scenario could also be related the chemical interaction (hydrogen bending) between the anhydride groups of the coupling agent (MPE) and the carboxyl groups of the functionalized MWCNTs.…”

Section: Resultsmentioning

confidence: 99%

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Improving the Mechanical Properties of Thermoplastic Polyolefins Using Recycled Low-Density Polyethylene and Multi-Walled Carbon Nanotubes

et al. 2021

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Thermoplastic polyolefin (TPO) has gained considerable attention because of having a combination of rubbery and thermoplastic properties and ease of production. Their excellent weather resistance, low density, and relatively low cost make them attractive materials for the automotive, electrical, footwear industries and membranes for water treatment. Their main shortcomings are poor mechanical properties, especially at low temperatures because of the opposing trends of stiffness and toughness. In this paper, recycled low density polyethylene (RLDPE) was integrated with ethylene-propylene-diene rubber (EPDM) incorporating very low content of carboxylated multi-walled carbon nanotubes (MWCNTs-COOH) to improve the mechanical properties of the produced TPO nanocomposite. TPO has been prepared through the combination of 40, 50, and 60 wt.% RLDPE and 40, 50, and 60 wt.% EBDM. The improved TPO composition was then reinforced with 0.1, 0.3, and 0.5 wt.% MWCNTs-COOH to produce TPO nanocomposites. The compounding of TPO and its nanocomposites was done by melt mixing followed by heat pressing. Mechanical and thermal behaviors of the TPO nanocomposites were investigated. Tensile tests showed that the TOP (60-40) is the best improved concentration; the storage modulus of nanocomposites was enhanced by increasing MWCNTs-COOH concentration. In addition, modulus, stress/strain and toughness of TPO were enhanced by adding 0.5 wt.% MWCNTs-COOH. Thus, MWCNTs-COOH reinforced TPO due to not only its large aspect ratios but also due to its interaction with both the TOP matrix and the combatibilizer. The results of microstructural investigations of the prepared TPO nanocomposite using FTIR and TGA confirmed the interaction between MWCNTs-COOH and TPO matrix

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Section: Resultsmentioning

confidence: 99%

“…TPOs have performance properties that are equivalent to conventional thermoset rubbers and can be processed as efficiently as thermoplastics. Therefore, they can be easily processed by injection molding, extrusion or blow molding [6,7,8].…”

Section: Introductionmentioning

confidence: 99%

Improving the Mechanical Properties of Thermoplastic Polyolefins Using Recycled Low-Density Polyethylene and Multi-Walled Carbon Nanotubes

et al. 2021

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“…As a result, PP‐g‐Py enhanced the wetting of fillers with the polymer matrix, thus facilitating layer separation and improving the dispersion. As discussed by Petrie et al, [ 36 ] grafting aminopyridine to PP increases its surface energy, thus lowering the interfacial energy between the matrix and the fillers, and enhancing both the initial wetting of the EG and the polymer infiltration that led to swelling and exfoliation. The aspect ratios of EG particles in PP‐g‐Py, as determined by image analysis from the TEM images, were in the range of 2–12.…”

Section: Resultsmentioning

confidence: 99%

Compatibilized polypropylene nanocomposites containing expanded graphite and graphene nanoplatelets

Kontopoulou

2021

Polymer Engineering & Sci

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We present a non‐covalent compatibilization approach to prepare polypropylene (PP) composites containing expanded graphite (EG) and graphene nanoplatelets (GNPs) by melt compounding. This method involves PP matrix functionalization with pyridine (Py) moieties, which are capable of engaging in π‐π interactions with the surface of the EG and GNPs. The addition of 10 wt% of PP grafted with amino‐pyridine (PP‐g‐Py) to neat PP facilitated the break‐up of EG particles, by intercalating between their layers and facilitating their separation into smaller tactoids. GNPs were prepared starting from EG through a thermomechanical exfoliation method. Addition of GNPs to PP resulted in well‐dispersed platelets having aspect ratios as high as 40, whereas in the presence of the PP‐g‐Py compatibilizer the matrix contained sub‐micron scale platelets. The electrical percolation thresholds were in the vicinity of 6 and 10 vol% in the compatibilized PP‐EG and PP‐GNP composites, respectively, and the maximum value of the electrical conductivity achieved was 10−1 S/m for the compatibilized GNP composites. Addition of GNPs resulted in increases in the flexural moduli by as much as 95% compared to the unfilled PP, whereas the impact strength remained unaffected up to 10 wt% GNP content.

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“…Several studies recently have discussed conductivity and other dielectric properties of filled random EOCs and their blends with other materials, where EOCs commonly are used for the toughening effect . As noted by the studies, the random EOC copolymers behave much lower percolation threshold compared to EOC block copolymers, due to the absence of interphase interaction between nanofiller particles widely localized between the amorphous and crystalline segments thus affecting enhancement of conductivity, whereas, in random copolymers, the particles locate mainly between the random segments of amorphous phase molecules .…”

Section: Resultsmentioning

confidence: 99%

Improvement of mechanical and dielectric properties of ethylene–octene copolymer by multi‐walled carbon nanotubes functionalized with poly(2,2′‐bithiophene)

et al. 2019

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In this study, Baytube™ multi-walled carbon nanotubes (MWCNTs) were in situ modified by graft-polymerized 2,2 0 -bithiophene. The obtained PBT-g-MWCNTs were used as fillers for the development of semi-conductive nanocomposites with ethylene-octene copolymer (EOC, ENGAGE™ 8540). The methods of infrared and Raman spectroscopy, thermogravimetric analysis, and transmission electron microscopy were used to characterize the filler materials. Composite specimens with neat MWCNTs and PBT-g-MWCNTs at their contents of 3, 5, and 10 wt% were made by ultra-sound assisted master batching method and their mechanical and dielectric properties were compared. The strength properties (storage modulus, tensile strength) and the elongation at break of the composites with high contents (> 3 wt%) of PBT-g-MWCNTs were notably improved comparing to EOC/MWCNT composites. A notable improvement by more than two orders of magnitude of EOC conductivity was determined at 10 wt% content of PBT-g-MWCNT compared to that of pristine MWCNTs used as the composite nanofiller. POLYM. COMPOS., 40:3971-3980, 2019. POLYMER COMPOSITES-2019FIG. 7. The storage modulus (a), loss modulus (b), and damping factor (c) of pristine EOC and EOC composites as a function of temperature.

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Controlling MWCNT partitioning and electrical conductivity in melt compounded polypropylene/poly(ethylene- co -octene) blends

Cited by 12 publications

References 43 publications

Improving the Mechanical Properties of Thermoplastic Polyolefins Using Recycled Low-Density Polyethylene and Multi-Walled Carbon Nanotubes

Improving the Mechanical Properties of Thermoplastic Polyolefins Using Recycled Low-Density Polyethylene and Multi-Walled Carbon Nanotubes

Compatibilized polypropylene nanocomposites containing expanded graphite and graphene nanoplatelets

Improvement of mechanical and dielectric properties of ethylene–octene copolymer by multi‐walled carbon nanotubes functionalized with poly(2,2′‐bithiophene)

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