Influence of Injection Molding Parameters on Mechanical Properties of Low Density Polyethylene Filled With Multiwalled Carbon Nanotubes

Fetecău, Cătălin; Stan, Felicia; Dobrea, Daniel; Birsan, Dan Catalin

doi:10.1115/imece2011-63591

Cited by 4 publications

(3 citation statements)

References 10 publications

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“…For example, an LDPE sample (Braskem) reportedly has MFI = 30 g/10 min and a modulus of 80 MPa . We report a 155 MPa modulus for LDPE with MFI = 1.1 g/10 min, and an LDPE sample (ARPECHIM) with MFI = 2.02 g/10 min has been reported as having a modulus of 200 MPa . These results suggest that Rusu et al may have reported a neat LDPE modulus significantly below its true value, which would provide an explanation for the extraordinarily large percentage enhancements in modulus they reported with lignin addition.…”

Section: Resultsmentioning

confidence: 48%

“…70 We report a 155 MPa modulus for LDPE with MFI = 1.1 g/10 min, and an LDPE sample (ARPECHIM) with MFI = 2.02 g/10 min has been reported as having a modulus of 200 MPa. 71 These results suggest that Rusu et al 36 may have reported a neat LDPE modulus significantly below its true value, which would provide an explanation for the extraordinarily large percentage enhancements in modulus they reported with lignin addition.) Hu et al 49 produced HDPE composites with 20 wt % lignin by melt mixing and reported a 15% increase in Young's modulus relative to neat HDPE, from 502 to 577 MPa.…”

Section: ■ Results and Discussionmentioning

confidence: 86%

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Sustainable Green Hybrids of Polyolefins and Lignin Yield Major Improvements in Mechanical Properties When Prepared via Solid-State Shear Pulverization

Iyer

Torkelson

2015

ACS Sustainable Chem. Eng.

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Lignin, a byproduct of paper and pulp industries, is a sustainable, inexpensive biomaterial with potential as composite filler. Past research on polyolefin/lignin composites made by melt processing has led to modest increases in Young’s modulus and drastic reductions in tensile strength and elongation at break relative to neat polymer. Here, green hybrids of low density polyethylene (LDPE) and polypropylene (PP) with 5–30 wt % lignin are made by solid-state shear pulverization (SSSP). Microscopy shows that SSSP leads to superior lignin dispersion and suppressed degradation when compared to melt-mixed composites reported in the literature. Composites made by SSSP exhibit major improvements in Young’s modulus (81% and 62% increases for 30 wt % lignin in LDPE and PP, respectively, relative to neat polymer), tensile strength equal to or better than that of neat LDPE and near that of neat PP, and much better strain at break than reported in the literature for polyolefin/lignin composites. The SSSP-produced hybrids exhibit major increases in hardness, with 70/30 wt % PP/lignin hybrids reaching values near that of polycarbonate. Well-dispersed lignin improves LDPE and PP thermo-oxidative stability as shown by thermogravimetric analysis (∼35 °C increase in 20% mass loss temperature in air with 20 wt % lignin addition) and isothermal shear flow rheology. Lastly, SSSP-processed composites exhibit slightly improved crystallizability and melt viscosities at moderate to high shear rates that differ relatively little from those of neat LDPE and PP.

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Section: Resultsmentioning

confidence: 48%

Section: ■ Results and Discussionmentioning

confidence: 86%

Sustainable Green Hybrids of Polyolefins and Lignin Yield Major Improvements in Mechanical Properties When Prepared via Solid-State Shear Pulverization

Iyer

Torkelson

2015

ACS Sustainable Chem. Eng.

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“…Generally, dissolving of the resin takes place on account of the frictional heat from the screw pivot inside the barrel. In a study by Fetecau et al [131], the effects of melt temperature, mould temperature, holding pressure and injection speed on properties of low-density polyethylene reinforced with 2.5 wt% multi-walled carbon nanotubes were assessed. The study showed melt temperature as the most significant factor affecting elastic modulus.…”

Section: Temperaturementioning

confidence: 99%

Trends in reinforced composite design for ionizing radiation shielding applications: a review

2021

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This review explored recent developments in reinforced composite design and applications for improved radiation shielding and high percentage attenuation. Radiation energy moves as a wave. Thus unguarded exposure to high-energy radiation is inimical to the human tissue and the overall health standing of individuals which may result in cancer, tumour, skin burns and cardiovascular diseases. Radiation energy is conventionally contained using lead-based shields. However, recent literature has faulted the continued use of lead citing drawbacks such as high toxicity, poisoning, lack of chemical stability, heaviness and hazardous after life handling. Consequently, the trending research evidence has shown mass deviation towards the use of reinforced polymer composite as an alternative to lead due to their light weight, low cost, high resilience, good mechanical tenacity and interesting electrical properties. The present review therefore summarizes the criteria for ionizing radiation shielding material design, mechanism of radiation energy shielding, beam penetration in composite shielding materials, theoretical shielding parameters in the design of radiation protective materials, scheme of reinforced composite material selection for shielding purposes and various control variables in the design of composite for ionizing radiation shielding. In addition, an attempt was made to highlight gaps in research and draw future scope for further studies. It is expected that this review will give some guidance to the future exploration in the design and application of reinforced composite with respect to ionizing radiation shielding processes.

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Investigation on microstructure and mechanical properties of samples obtained by injection from Arbofill

Nedelcu

2013

Composites Part B: Engineering

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Influence of Injection Molding Parameters on Mechanical Properties of Low Density Polyethylene Filled With Multiwalled Carbon Nanotubes

Cited by 4 publications

References 10 publications

Sustainable Green Hybrids of Polyolefins and Lignin Yield Major Improvements in Mechanical Properties When Prepared via Solid-State Shear Pulverization

Sustainable Green Hybrids of Polyolefins and Lignin Yield Major Improvements in Mechanical Properties When Prepared via Solid-State Shear Pulverization

Trends in reinforced composite design for ionizing radiation shielding applications: a review

Investigation on microstructure and mechanical properties of samples obtained by injection from Arbofill

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