Development and characterisation of HDPE/EPDM-g-TMEVS blends for mechanical and morphological properties for engineering applications

Divya, Velpula; Pattanshetti, V.V.; Suresh, R.; Sailaja, R. R. N.

doi:10.1007/s10965-012-0051-y

Cited by 21 publications

(8 citation statements)

References 23 publications

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“…DSC plots display endothermic and exothermic peaks, representing melting enthalpy at cold crystallization. Crystallinity % (α Cryst ) is assessed as 56 where, Δ H m = heat of fusion in J/g and Δ H m * = heat of fusion/gram for HDPE, 293 J/g 57 and W GMB is the weight fraction of GMBs. A dilatometer, CIPET, Chennai, is used to estimate CTE for prints (ASTM D696-13) having a dimension of 75 × 12.7 × 3 mm.…”

Section: Methodsmentioning

confidence: 99%

Three-Dimensional Printed Lightweight Composite Foams

et al. 2020

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The goal of this paper is to enable three-dimensional (3D) printed lightweight composite foams by blending hollow glass microballoons (GMBs) with high density polyethylene (HDPE). To that end, lightweight feedstock for printing syntactic foam composites is developed. The blend for this is prepared by varying the GMB content (20, 40, and 60 volume %) in HDPE for filament extrusion, which is subsequently used for 3D printing. The rheological properties and the melt flow index (MFI) of blends are investigated for identifying suitable printing parameters. It is observed that the storage and loss modulus, as well as complex viscosity, increase with increasing GMB content, whereas MFI decreases. Further, the coefficient of thermal expansion of HDPE and foam filaments decreases with increasing GMB content, thereby lowering the thermal stresses in prints, which promotes the reduction in warpage. The mechanical properties of filaments are determined by subjecting them to tensile tests, whereas 3D printed samples are tested under tensile and flexure tests. The tensile modulus of the filament increases with increasing GMB content (8–47%) as compared to HDPE and exhibit comparable filament strength. 3D printed foams show a higher specific tensile and flexural modulus as compared to neat HDPE, making them suitable candidate materials for weight-sensitive applications. HDPE having 60% by volume GMB exhibited the highest modulus and is 48.02% higher than the printed HDPE. Finally, the property map reveals a higher modulus and comparable strength against injection- and compression-molded foams. Printed foam registered 1.8 times higher modulus than the molded samples. Hence, 3D printed foams have the potential for replacing components processed through conventional manufacturing processes that have limitations on geometrically complex designs, lead time, and associated costs.

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Section: Methodsmentioning

confidence: 99%

Three-Dimensional Printed Lightweight Composite Foams

et al. 2020

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“…The shapes of Si and CB filler particulates and the layered shape of MC and GP fillers were also clearly observed. It is known that gas permeability through a polymer composite is closely dependent on polymer structure, filler nature, and filler loading [21][22][23]. Therefore, permeation coefficients through rubber composites for different rubber materials, filler natures, and filler loadings were determined in detail.…”

Section: Resultsmentioning

confidence: 99%

Transport behavior of R134a refrigerant through rubber composites

2015

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The transport behavior of commercial R134a (1, 1,1,2-tetrafuoroethane) refrigerant including its permeability, adsorption, and diffusion through rubber composites were investigated. Butadiene-acrylonitrile rubber (NBR), brominated butyl rubber (BIIR), and epichlorohydrin rubber (ECO) were used as a matrix, while silica, carbon black, mica sheet, and graphite were used as fillers in the present study. The effects of rubber structure and geometry, surface polarity, as well as loading of filler on transport behavior were studied to correlate transport parameters with the rubber structure and filler nature. The R134a permeation in rubber composites was largely dominated by diffusion rather than solubility. The polarities of rubber and filler played dominant roles in determining the solubility, whereas the structure of rubber and the shape and loading of filler exerted a stronger effect on diffusion than solubility. Nonpolar and layered graphite-filled BIIR rubber composites showed the lowest permeability to R134a. Additionally, shell-like free volume theory was applied to reasonably explain R134a transport behavior.

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“…Crystallinity ( X c ) was calculated by the formula: X c = ( ΔH m / ΔH m0 ) × 100%. ΔH m is the melting enthalpy of the samples, and ΔH m0 is the melting enthalpy of the fully crystalline polyethylene (293.0 J/g) 27 …”

Section: Methodsmentioning

confidence: 99%

Exploring the entangled state and molecular weight ofUHMWPEon the microstructure and mechanical properties ofHDPE/UHMWPEblends

Tao

Chen

et al. 2021

J of Applied Polymer Sci

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Three types of ultra‐high molecular weight polyethylene (UHMWPE) with different entangled state and molecular weight were blended with high‐density polyethylene (HDPE) matrix by melt blending. Rheology, 2D‐SAXS, 2D‐WAXD, DSC, and mechanical tests were used to study the evolution and difference of microstructure and mechanical properties of the blends. The addition of weakly entangled UHMWPE enhanced the chain diffusion and chain orientation ability under a specific flow field. Thus, the rheological properties and mechanical properties of the blends were improved with the mix of weakly entangled UHMWPE. The mechanical properties enhancement effect of HDPE/UHMWPE blends with weakly entangled UHMWPE was owing to the shish‐kebab structure formed in the injection molding process. The molecular chains of UHMWPE with a low degree of entanglement and high molecular weight increased the lamella size and crystallinity of the blends during processing. This leads to the formation of more oriented shish structures and more kebab lamella. Besides, the molecular chains of weakly entangled UHMWPE were better interlocked and intertwined with other polyethylene chains in the amorphous region, acting as the tie molecules, significantly improving the impact resistance.

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Development and characterisation of HDPE/EPDM-g-TMEVS blends for mechanical and morphological properties for engineering applications

Cited by 21 publications

References 23 publications

Three-Dimensional Printed Lightweight Composite Foams

Three-Dimensional Printed Lightweight Composite Foams

Transport behavior of R134a refrigerant through rubber composites

Exploring the entangled state and molecular weight ofUHMWPEon the microstructure and mechanical properties ofHDPE/UHMWPEblends

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