scholarly journals The use of ground & ultrasonicated dolomite (GUD) for improving the tensile performance of Poly (ethylene-co-vinyl acetate) copolymer composite

2021 ◽  
Vol 2080 (1) ◽  
pp. 012029
Author(s):  
Asfa Amalia Ahmad Fauzi ◽  
Azlin Fazlina Osman ◽  
Khairul Anwar Abdul Halim ◽  
Zaleha Mustafa ◽  
Abdulkader M. Alakrach ◽  
...  
Keyword(s):  
Vinyl Acetate ◽  
Composite System ◽  
Mechanical Performance ◽  
Inorganic Materials ◽  
Elongation At Break ◽  
Tensile Performance ◽  
New Form ◽  
Poly Ethylene ◽  
Acetate Copolymer ◽  
Tensile Toughness

Abstract The combination of the organic and inorganic materials to fabricate a new form of material called ‘composite’ has been performed since several decades ago. However, the strategy to improve the homogeneity of the resultant composite system is still being the main focus of current research. In this study, dolomite and poly (ethylene-co-vinyl acetate) (PEVAc) were employed as filler and matrix, respectively. Dolomite was ground and ultrasonicated before being used as filler. It can be observed that the size of dolomite particles has been reduced significantly upon the grinding and ultrasonication processes. The effect of ground and ultrasonicated dolomite (GUD) addition on the mechanical performance of the PEVAc copolymer was investigated. Results indicate that the GUD filler has successfully increased the tensile strength, elongation at break, modulus of elasticity and tensile toughness of the PEVAc copolymer when being employed in 1 wt%. However, the use of higher content of GUD resulted in the decreasing trend of those properties. This shows that the ground and ultrasonicated dolomite with smaller and higher surface area particles than its pristine form could bring improvement to the mechanical performance of the copolymer when being used in low loading as it can be more easily dispersed in the copolymer matrix.

Incorporation of Hybrid Pre-Dispersed Organo-Montmorillonite/ Destabilized Bentonite Nanofillers for Improving Tensile Strength of PEVA Copolymer with 40% Vinyl Acetate Composition

2020 ◽  
Vol 1010 ◽  
pp. 118-123
Author(s):  
Tuty Fareyhynn Mohammed Fitri ◽  
Azlin Fazlina Osman ◽  
Rahimah Othman ◽  
Zaleha Mustafa
Keyword(s):  
Tensile Strength ◽  
Vinyl Acetate ◽  
Mechanical Performance ◽  
Matrix Material ◽  
Tensile Load ◽  
Sem Analysis ◽  
Hybrid Nanocomposite ◽  
Elongation At Break ◽  
Melt Compounding ◽  
Poly Ethylene

In this work, soft and flexible poly (ethylene-co-vinyl acetate) (PEVA) with 40% vinyl acetate (VA) composition was used as matrix material to form nanocomposites with single nanofiller (organo-montmorillonite (OMMT) or Bentonite (Bent)) and hybrid nanofillers (OMMT+Bent in the ratios of 4:1, 3:2, 2:3 and 1:4). In order to achieve greater exfoliation and dispersion of the hybrid nanofillers in the PEVA matrix, the pre- dispersing and destabilization technique was applied to the O-MMT and Bent, respectively. The procedures were done prior to the melt compounding process of the nanocomposite. A tensile test was done to evaluate the mechanical properties of the resultant nanocomposites and to allow the selection of the best OMMT/Bent ratio for the production of the hybrid nanocomposite. The structure and fractured surfaces of the neat PEVA and nanocomposite were analyzed using Fourier Transform Infrared (FTIR) and Scanning Electron Microscopy (SEM), respectively. Results indicated that the addition of hybrid pre-dispersed OMMT/destabilized bentonite nanofillers into the PEVA matrix resulted in greater mechanical performance as compared to the single OMMT or single Bent nanofiller. The best achievement in the tensile strength and elongation at break of the PEVA hybrid nanocomposite was obtained when the hybrid nanofillers was added in the ratio of 4:1 (OMMT: Bent). The SEM analysis showed that the PEVA hybrid nanocomposite with 4OMMT: 1Bent had greater matrix deformation than the neat PEVA when subjected to tensile load. This mechanical deformation could be related to the increased flexibility of the PEVA chains which facilitated more energy absorption during the stretching of the material. Apparently, this mechanism acted as a matrix toughening process which allowed the increment of both tensile strength and elongation at break values of the PEVA upon the addition of the hybrid nanofillers.

Investigation of physical properties and morphology of compatibilized EPDM/EVA blends

2017 ◽  
Vol 31 (3) ◽  
pp. 376-391 ◽  
Author(s):  
Aman I Khalaf ◽  
Azza A Ward ◽  
Nehad N Rozik
Keyword(s):  
Vinyl Acetate ◽  
Ethylene Vinyl Acetate ◽  
Elongation At Break ◽  
Oxidative Aging ◽  
Itaconic Anhydride ◽  
Aging Resistance ◽  
Before And After ◽  
Time Periods ◽  
Poly Ethylene ◽  
Thermal Oxidative Aging

The main aim is to investigate the effect of adding of 5% hydrolyzed poly (ethylene-co-vinyl acetate) (EVAOH), itaconic anhydride (naturally obtained during fermentation of sugars (It.anhydride)), and mercapto-modified ethylene-co-vinyl acetate (EVASH) as compatibilizers on the mechanical properties before and after thermal oxidative aging at 90°C for different time periods up to 7 days, electrical properties, and morphology of ethylene propylene diene monomer/ethylene vinyl acetate (EPDM/EVA) blends of different compositions (75/25, 60/40, 50/50, and 25/75, respectively). Stress at yield, tensile strength, and elongation at break of EPDM/EVA were improved markedly by the addition of 5% compatibilizers (EVAOH, It.anhydride, and EVASH). The micrographs of fractured surfaces obtained from the scanning electron microscope demonstrated further the enhancement of compatibility between EPDM and EVA by the addition of reactive compatibilizers. Further, the blends permittivity ε′ and dielectric loss ε″ have been measured at specific temperatures. The dielectric properties revealed that It.anhydride and EVASH/EPDM/EVA compositions are promising materials for insulation purposes. Finally, aging resistance was improved by the use of compatibilizers.

Enhanced fire-retardancy of poly(ethylene vinyl acetate) electrical cable coatings containing microencapsulated ammonium polyphosphate as intumescent flame retardant

RSC Advances ◽  
2016 ◽  
Vol 6 (88) ◽  
pp. 85564-85573 ◽  
Author(s):  
Yan Zhang ◽  
Bibo Wang ◽  
Haibo Sheng ◽  
Bihe Yuan ◽  
Bin Yu ◽  
...  
Keyword(s):  
Flame Retardant ◽  
Vinyl Acetate ◽  
Ethylene Vinyl Acetate ◽  
Fire Retardancy ◽  
Electrical Cable ◽  
Fire Hazards ◽  
Poly Ethylene ◽  
Microencapsulated Ammonium Polyphosphate ◽  
Acetate Copolymer ◽  
Ethylene Vinyl Acetate Copolymer

There is a need to improve and maintain the protection function of ethylene-vinyl acetate copolymer (EVA) cable materials from ageing degradation to avoid fire hazards and extend their service lives.

Utilization of Maleic Anhydride Modified Ground EVA Waste in NBR Vulcanizates

2005 ◽  
Vol 78 (1) ◽  
pp. 1-16 ◽  
Author(s):  
Bluma G. Soares ◽  
Ana C. O. Gomes ◽  
Viviane X. Moreira ◽  
Marcia G. Oliveira
Keyword(s):  
Tensile Strength ◽  
Maleic Anhydride ◽  
Mechanical Performance ◽  
Dynamic Testing ◽  
Good Resistance ◽  
Adhesion Promoter ◽  
Elongation At Break ◽  
Compression Set ◽  
Lower Elongation ◽  
Poly Ethylene

Abstract The influence of poly(ethylene-co-vinyl acetate) (EVA) waste (EVAW) on the rheological and mechanical properties of NBR vulcanizates compounds was studied. The optimum concentration of EVAW, which has presented higher ultimate tensile strength, was found to be 70 phr. In addition, the influence of EVAW modified with maleic anhydride as adhesion promoter was studied. Two distinct routes of modification with maleic anhydride were selected, originating a carboxylated EVA waste (EVAWCOOH) and an anhydride EVA waste (EVAWMA). An improvement of tensile strength and aging resistance was observed with the substitution of EVAW by EVAWCOOH or EVAWMA. A very good resistance to compression set has been achieved with the addition of EVAWCOOH. The improvement of mechanical performance was attributed to a better dispersion of EVAW along NBR matrix, promoted by the enhanced modified-waste polarity, which allowed a good interaction with polar NBR. The presence of anhydride group in functionalized EVAW resulted in the highest values of tensile strength but lower elongation at break and also lower values of tan delta obtained from dynamic testing. These behaviors have been attributed to an increase of crosslink density due to the reaction between zinc oxide and succinic pendant groups of EVAWMA.

Vibrational spectroscopic and ultrasound analysis for the in-process monitoring of poly(ethylene vinyl acetate) copolymer composition during melt extrusion

The Analyst ◽  
2005 ◽  
Vol 130 (3) ◽  
pp. 286 ◽  
Author(s):  
S. E. Barnes ◽  
E. C. Brown ◽  
M. G. Sibley ◽  
H. G. M. Edwards ◽  
P. D. Coates
Keyword(s):  
Vinyl Acetate ◽  
Process Monitoring ◽  
Ethylene Vinyl Acetate ◽  
Copolymer Composition ◽  
Melt Extrusion ◽  
Poly Ethylene ◽  
Acetate Copolymer ◽  
Ethylene Vinyl Acetate Copolymer

Melt grafting of poly(ethylene-vinyl acetate) copolymer with maleic anhydride

2006 ◽  
Vol 102 (1) ◽  
pp. 841-846 ◽  
Author(s):  
Jun Yin ◽  
Jun Zhang ◽  
Yu Yao
Keyword(s):  
Maleic Anhydride ◽  
Vinyl Acetate ◽  
Ethylene Vinyl Acetate ◽  
Melt Grafting ◽  
Poly Ethylene ◽  
Acetate Copolymer ◽  
Ethylene Vinyl Acetate Copolymer

scholarly journals Characterization of Low-Density Polyethylene and LDPE-Based/Ethylene-Vinyl Acetate with Medium Content of Vinyl Acetate

Polymers ◽  
2021 ◽  
Vol 13 (14) ◽  
pp. 2352
Author(s):  
Nga Thi-Hong Pham
Keyword(s):  
Flexural Strength ◽  
Vinyl Acetate ◽  
Ethylene Vinyl Acetate ◽  
Spherical Particles ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Elongation At Break ◽  
Polar Polymers ◽  
Acetate Copolymer

Low-density polyethylene (LDPE) and ethylene vinyl acetate copolymer (EVA), which are non-polar and polar polymers, are immiscible and form a polyphase system. In this study, LDPE was mixed with 2.5%, 5%, 7.5%, 10%, 12.5% Ethylene-vinyl acetate (EVA-28) with a medium content of vinyl acetate (28% VA), respectively by injection molding machine and LDPE. Tensile strength and flexural strength were tested according to ASTM D638-02 standard and ISO 178 standard. The results showed that adding EVA-28 increased the elongation at break of the LDPE/2.5% EVA, LDPE/5% EVA and LDPE/10% EVA blend samples. In addition, the tensile and flexural strength of the LDPE/EVA blend decreases gradually as the EVA-28 content in the blend increases. The hardness decreases with the increasing EVA-28 content. EVA-28 spherical particles appeared scattered on the surface of the LDPE matrix, in the highest EVA-28 percent sample (12.5% EVA-28), the number of particles appeared to be quite a lot, and was dispersed quite evenly on the surface. The LDPE/EVA-28 blend achieved a higher elongation at the break than LDPE, in which 10% EVA-28 gives the highest elongation at break.

A hybrid mathematical modeling strategy for controlling the mechanical performance of polyethylene/poly(ethylene-co-vinyl acetate)/Nanoclay cast films

2019 ◽  
Vol 79 ◽  
pp. 106089 ◽  
Author(s):  
Reza Ghasemi ◽  
Farkhondeh Hemmati ◽  
Alireza Shadman ◽  
Jamshid Mohammadi-Roshandeh ◽  
Tara Farizeh ◽  
...  
Keyword(s):  
Mathematical Modeling ◽  
Vinyl Acetate ◽  
Mechanical Performance ◽  
Cast Films ◽  
Poly Ethylene ◽  
Modeling Strategy
Sign in / Sign up

Export Citation Format

Share Document