High-temperature study of radiation cross-linked ethylene–octene copolymers

Svoboda, Petr

doi:10.1007/s00289-016-1703-6

Cited by 9 publications

(6 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The ratio of the parameters G(X)/G(S)=1.61 indicates that cross-linking prevails over the scission for this copolymer. The ratio G(X)/G(S)=1.61 is comparable to our previous results on ethylene-octene copolymer with 30 wt.% of octene [37] when the ratio was 1.77.…”

Section: Resultssupporting

confidence: 89%

Influence of Electron Beam Irradiation on High‐Temperature Mechanical Properties of Ethylene Vinyl Acetate/Carbon Fibers Composites

Hamid

Svoboda

Svobodová

2019

Vinyl Additive Technology

Self Cite

View full text Add to dashboard Cite

The purpose of this study was to investigate the effect of carbon fiber (CF) and electron-beam (EB) radiation on high-temperature mechanical properties of ethylenevinyl acetate (EVA). Polymer composites were prepared by mixing on a two-roll mill.After compression molding, the samples were irradiated between 60 and 180 kGy, and dynamic mechanical analysis (DMA) was used to characterize physical properties.The effects of filler content and radiation level on the mechanical properties of EVA/CF were evaluated. The shear stress and modulus were observed to increase with increasing of the filler level. However, there was a dramatic decrease in creep compliance. It was also shown that introduction of irradiation on EVA composite increases the shear stress and the real part of the dynamic shear modulus G' due to the increase in molecular weight and cross-linking of the polymer after irradiation.

show abstract

Section: Resultssupporting

confidence: 89%

Influence of Electron Beam Irradiation on High‐Temperature Mechanical Properties of Ethylene Vinyl Acetate/Carbon Fibers Composites

Hamid

Svoboda

Svobodová

2019

Vinyl Additive Technology

Self Cite

View full text Add to dashboard Cite

show abstract

“…b. The glass transition temperature around −23°C for neat EOC and filler loaded composites coincided with the values reported by Svoboda . A strong reinforcing effect with increase of filler loading was determined around temperatures below the glass transition, due to the reinforcing effect of filler at the amorphous phase of EOC.…”

Section: Resultssupporting

confidence: 86%

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

et al. 2019

View full text Add to dashboard Cite

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.

show abstract

“…The ability of EOC to form a network was influenced by its blending with polypropylene and the presence of the branching agent. 62 As a result, the branching outcompeted crosslinking formation, leading to a minimal amount of gel in the sample representing networking.…”

Section: Fourier Transform Infrared Spectroscopymentioning

confidence: 99%

A pragmatic approach to analyze the ability of ethylene‐octene copolymer in the long chain branching of polypropylene in molten and solid state

Negaresh,

Karbalaei‐Bagher,

Jahani

et al. 2023

SPE Polymers

View full text Add to dashboard Cite

The investigation of chain branching in polypropylene (PP) holds significant importance for comprehending the impact of structural modifications on the properties of PP. The utilization of ethylene‐octene copolymer (EOC) presents a valuable opportunity to examine the influence of branching density on the ability of electron beam irradiation or a chemical agent in a PP blend. The introducing long chain branches (LCB) into PP can enhance its mechanical properties, particularly impact strength. This characteristic is of particular significance in applications where the material is subjected to mechanical stress, such as automotive components or packaging materials. Blends of PP/EOC were produced using 20 and 30 wt% of EOC and 0.5 phr trimethylolpropane trimethacrylate (TMPTMA) monomer. To evaluate the efficiency of branching in both solid and molten states, irradiated samples and samples mixed with dicumyl peroxide (DCP) were selected. The rheological properties of the molten blends in shear and extensional modes were assessed, and their morphology was examined using scanning electron microscopy. The existence of LCB in all samples was confirmed through dynamic viscoelastic measurements. It was concluded that although the irradiation promoted chain scission within the backbone, which resulted in long chain branching, DCP created LCB on the backbone chains of PP through chemical reaction in the melt state. Additionally, the strain hardening constant (n) was calculated, and its value for the irradiated sample PP/EOC 80/20 was 0.19, whereas its value for this blend when employing DCP was 0.14. While the complex viscosity of irradiated blend (8764 Pa.s) was greater than that of melt state branched blend (8377 Pa.s) at 0.1 rad/s, in the higher frequencies it became smaller due to the more effective creation of long chain branches through peroxide grafting in the molten state. The results of the study verified the presence of LCB in the materials by observing longer relaxation time and strain hardening behavior.Highlights The chain branching of PP/EOC blends was investigated in both the melt state and solid state through the presence of TMPTMA monomer. The effectiveness of TMPTMA monomer in grafting was mostly notable in the molten state. The steady state viscosity of LCB‐(PP/EOC) was higher in the presence of dicumyl peroxide compared to irradiated PP/EOC. The samples containing 80 wt% of PP exhibited longer side branches compared to the sample with 70 wt% of PP according to shear and extensional rheometry. The induced side chain branches resulting from irradiation and the use of dicumyl peroxide help increase the miscibility of the polymers to a similar extent.

show abstract

High-temperature study of radiation cross-linked ethylene–octene copolymers

Abstract: Svoboda P. High-temperature study of radiation cross-linked ethylene-octene copolymers.

Cited by 9 publications

References 32 publications

Influence of Electron Beam Irradiation on High‐Temperature Mechanical Properties of Ethylene Vinyl Acetate/Carbon Fibers Composites

Influence of Electron Beam Irradiation on High‐Temperature Mechanical Properties of Ethylene Vinyl Acetate/Carbon Fibers Composites

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

A pragmatic approach to analyze the ability of ethylene‐octene copolymer in the long chain branching of polypropylene in molten and solid state

Contact Info

Product

Resources

About