scholarly journals Improving Mechanical Properties and Reaction to Fire of EVA/LLDPE Blends for Cable Applications with Melamine Triazine and Bentonite Clay

Materials ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2393 ◽  
Author(s):  
Sanchez-Olivares ◽  
Sanchez-Solis ◽  
Manero ◽  
Pérez-Chávez ◽  
Jaramillo ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Bentonite Clay ◽  
Ethylene Vinyl Acetate ◽  
Elongation At Break ◽  
High Performing ◽  
Copolymer Blends ◽  
Property Evaluation ◽  
Electric Cables ◽  
Halogen Free ◽  
Acetate Copolymer

The high flame-retardant loading required for ethylene-vinyl acetate copolymer blends with polyethylene (EVA-PE) employed for insulation and sheathing of electric cables represents a significant limitation in processability and final mechanical properties. In this work, melamine triazine (TRZ) and modified bentonite clay have been investigated in combination with aluminum trihydroxide (ATH) for the production of EVA-PE composites with excellent fire safety and improved mechanical properties. Optimized formulations with only 120 parts per hundred resin (phr) of ATH can achieve self-extinguishing behavior according to the UL94 classification (V0 rating), as well as reduced combustion kinetics and smoke production. Mechanical property evaluation shows reduced stiffness and improved elongation at break with respect to commonly employed EVA-PE/ATH composites. The reduction in filler content also provides improved processability and cost reductions. The results presented here allow for a viable and halogen-free strategy for the preparation of high performing EVA-PE composites.

Study of Utilization of Ground EVA Waste as Filler in NBR Vulcanizates

2002 ◽  
Vol 10 (5) ◽  
pp. 381-390 ◽  
Author(s):  
Viviane Xavier Moreira ◽  
Bluma Guenther Soares
Keyword(s):  
Mechanical Properties ◽  
Ethylene Vinyl Acetate ◽  
Dynamic Mechanical Properties ◽  
Elongation At Break ◽  
Rubber Blends ◽  
Dynamic Mechanical ◽  
Footwear Industry ◽  
Wide Range ◽  
Acetate Copolymer ◽  
Ethylene Vinyl Acetate Copolymer

Rubber blends containing nitrile rubber (NBR) and ground ethylene-vinyl acetate copolymer waste (EVAW) from the footwear industry have been prepared over a wide range of composition (up to 90 phr of waste component). The ground EVAW had particle size in the range of 100-350 mm and a gel content of 60±5%. The effect of different amounts of EVA waste on the tensile strength, elongation at break, hardness, tear strength and dynamic mechanical properties was studied. EVAW had a good reinforcing effect on the NBR matrix. A combination of optimum tensile properties, resistance to solvent penetration and dynamic mechanical properties, such as storage modulus and loss tangent was achieved by introducing 50 phr of EVAW in the NBR matrix. This composition also presents a more uniform morphology, as indicated by scanning electron microscopy.

scholarly journals STUDY ON SOME PROPERTIES AND MORPHOLOGY OF COMPOSITES BASED ON POLYETHYLENE GRAFTED ACRYLIC ACID/ETHYLENE-VINYL ACETATE COPOLYMER/CALCIUM CARBONATE

2017 ◽  
Vol 25 (2) ◽  
pp. 355-361
Author(s):  
Thai Hoang ◽  
Do Van Cong
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Calcium Carbonate ◽  
Acrylic Acid ◽  
Ethylene Vinyl Acetate ◽  
Melt Mixing ◽  
Elongation At Break ◽  
Acetate Copolymer ◽  
Ethylene Vinyl Acetate Copolymer ◽  
Better Than

Composites based on polyethylene grafted acrylic acid (PE-g-AAc)/ethylene-co-vinylacetate copolymer (EVA)/calcium carbonate (CaCO3) were prepared by melt mixing. Relative melt viscosity, morphology, mechanical properties and thermostability of the composites were studied. The experimental results show that the presence of (CaCO3) activated by stearic acid (10-20 wt.%) changes lightly stable torque of polymer blend of PE-g-AAc/EVA. Use of modified PE improves compatibility of PE and EVA as well as makes the components disperse into each other better than in blends using unmodified PE. Tensile strength and elongation at break of both polymer blends decrease with presence of CaCO3. However, tensile strength of the composites of PE-g-AAc/EVA/CaCO3 is higher than that of composites of PE/EVA/CaCO3. Beside that, the composites of PE-g-AAc/EVA/CaCO3 have thermostability higher than the composites of PE/EVA/CaCO3.  

Morphology and Mechanical Properties of LDPE, EVA and Fly Ash Composites

2020 ◽  
Vol 869 ◽  
pp. 76-81
Author(s):  
Vu Minh Trong ◽  
Bui Dinh Hoan
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Ethylene Vinyl Acetate ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Melt Mixing ◽  
Elongation At Break ◽  
Acetate Copolymer ◽  
Ethylene Vinyl Acetate Copolymer ◽  
Morphology And Mechanical Properties

The fly ash from Pha Lai power plant was modified by vinyltrimetoxysilan (VTMS). The polymer composites based on low-density polyethylene (LDPE), ethylene vinyl acetate copolymer (EVA) and fly ash (FA) without and with vinyltrimetoxysilan (VTMS) modification were prepared by melt mixing in a Haake Rheomixer. The tensile strength and elongation at break of the LDPE/EVA/VFA composites were also higher than those of the LDPE/EVA/FA composites. The FESEM images proved that FA-VTMS particles disperse more regularly in the polymer matrix in comparison with FA without VTMS modification. In addition, the surface modification of the FA reduced the size of agglomeration of FA particles.

scholarly journals Optimization of the Mechanical Properties of Polyolefin Composites Loaded with Mineral Fillers for Flame Retardant Cables

Micro ◽  
2021 ◽  
Vol 1 (1) ◽  
pp. 102-119
Author(s):  
Sara Haveriku ◽  
Michela Meucci ◽  
Marco Badalassi ◽  
Camillo Cardelli ◽  
Giacomo Ruggeri ◽  
...  
Keyword(s):  
Flame Retardant ◽  
Vinyl Acetate ◽  
Weight Ratio ◽  
Fire Retardant ◽  
Ethylene Vinyl Acetate ◽  
Flame Retardant Properties ◽  
Electric Cables ◽  
Halogen Free ◽  
Mineral Fillers ◽  
Acetate Copolymer

Formulations based on mineral fillers and polymeric matrices of different nature were studied to obtain halogen-free flame retardant compounds (HFFR) for cable applications. The work was carried out by comparing fire-retardant mineral fillers of natural origin with synthetic mineral ones available on the market. As a reference, a formulation based on micronized natural magnesium hydroxide (n-MDH, obtained from brucite) and an ethylene-vinyl acetate copolymer with 28% by weight (11% by moles) of vinyl acetate were selected, and the mechanical and flame retardant properties compared with formulations based on secondary polymers combined with EVA, metal hydroxides, and carbonates. Notably, we found a synergistic effect in the mechanical, rheological and flame retardant properties for the composite containing a mixture of n-MDH and boehmite in a 3:1 weight ratio. Overall, the present work provided a complete and optimized recipe for the formulation of polymer composites characterized by the required flame retardant and mechanical features in electric cables applications.

Mechanical Properties of Superconcentrates Based on Ethylene-Vinyl Acetate Copolymer and Microcrystalline Cellulose

2020 ◽  
Vol 992 ◽  
pp. 306-310
Author(s):  
P.G. Shelenkov ◽  
P.V. Pantyukhov ◽  
A.A. Popov
Keyword(s):  
Mechanical Properties ◽  
Vinyl Acetate ◽  
Microcrystalline Cellulose ◽  
Melt Flow Index ◽  
Ethylene Vinyl Acetate ◽  
Flow Index ◽  
Rheological Characteristics ◽  
Elongation At Break ◽  
Acetate Copolymer ◽  
Ethylene Vinyl Acetate Copolymer

In the study, highly filled superconcentrates based on various grades of ethylene-vinylacetate copolymer (EVA) and microcrystalline cellulose (MCC) were studied. It is assumed that adding superconcentrates to various polyolefins will make them biodegradable in the environment. The influence of EVA rheological characteristics and the content of vinyl acetate (VA) groups on the properties of the superconcentrates were studied. It was shown that increasing the concentration of VA groups in EVA leads to an increase in the elongation at break of the composites; increase in EVA melt flow index (MFI) greatly reduces the basic mechanical properties of the composite.

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