Crystallinity and rheology of <scp>HDPE</scp>/<scp>PA12</scp> blends compatibilized with <scp>HDPE‐alt‐MAH</scp>

Silva, Geovane de Almeida Santos da; d’Almeida, J.R.M.; Letichevsky, Sonia; Avillez, Roberto Ribeiro de

doi:10.1002/pat.5873

Cited by 2 publications

(6 citation statements)

References 65 publications

(153 reference statements)

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“…The degree of crystallinity of unfilled PE (71.2%) was also calculated by integration of the Rietveld refined peaks for comparison and a value of 72.5% was obtained, which validates the curve fitting approach. These values are within the range for a typical HDPE sample 8,23,26,35 . In fact, a degree of crystallinity of 75% was reported by da Silva et al 26 for a HDPE sample made under similar processing conditions, with pellets from the same supplier.…”

Section: Resultssupporting

confidence: 83%

“…However, in composite materials, the addition of fillers can result in different peak profiles due to filler‐matrix interactions during solidification 23,24 . In these cases, the Rietveld method may not provide acceptable goodness of fitting and the deconvolution of overlapping crystalline and amorphous peaks can be achieved by fitting the experimental curve with a mathematical model 23–27 …”

Section: Methodsmentioning

confidence: 99%

“…The degree of crystallinity (

X_{c}

) was calculated as per Equation () 26 considering only the peaks identified as PE reflections:

X_{c} (%) = \frac{A_{c}}{A_{a} + A_{c}} \times 100

where

A

is the integrated area of PE peaks in each pattern, while the subscripts

a

and

c

refer to amorphous and crystalline, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…23,24 In these cases, the Rietveld method may not provide acceptable goodness of fitting and the deconvolution of overlapping crystalline and amorphous peaks can be achieved by fitting the experimental curve with a mathematical model. [23][24][25][26][27] The curve fitting procedure was used to fit the unfilled PE and PES composite XRD patterns and obtain the integrated areas of the amorphous and crystalline peaks. Angular positions of the crystalline peaks and amorphous halo were estimated based on the Rietveld refinement of the matrix and were allowed to shift up to 0.05 , which was the maximum shift observed in the experimental data.…”

Section: Preparation Of Compositesmentioning

confidence: 99%

“…The degree of crystallinity (X c ) was calculated as per Equation (1) 26 considering only the peaks identified as PE reflections:…”

Section: Characterizationmentioning

confidence: 99%

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Thermo‐mechanical properties of polyethylene composites filled with soapstone waste

de Sousa,

Kalantar Mehrjerdi,

Skrifvars

et al. 2023

J of Applied Polymer Sci

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In this study, soapstone waste originated from craftsmanship activities was used as an alternative filler (0–30 wt%) for a high‐density polyethylene (PE) matrix. The aim of this paper is to understand the effect of the filler particles on crystallinity, thermal stability and thermo‐mechanical properties of this newly developed composite material. Physico‐chemical characterization was performed by x‐ray diffraction (XRD) and Fourier‐transform infrared (FTIR) spectroscopy. Thermogravimetric analysis (TGA), oxidation induction time (OIT) and dynamic mechanical thermal analysis (DMA) were performed to assess the effect of the filler on the themo‐mechanical properties of PE. Thermal stability, measured by TGA, was enhanced, while OIT values reduced with filler content. A significant increase on the storage modulus of the composites (up to 148% in comparison with unfilled PE) was observed and this reinforcing effect was even more prominent at higher temperatures. XRD analysis revealed that the degree of crystallinity improved significantly with soapstone loading, which explains the substantial increase in stiffness observed. Increased crystallinity is also associated with higher strength, reduced residual stress, and better dimensional stability of end products, which can be particularly attractive for pressure pipe applications.

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Section: Resultssupporting

confidence: 83%

Section: Methodsmentioning

confidence: 99%

“…The degree of crystallinity (

X_{c}

) was calculated as per Equation () 26 considering only the peaks identified as PE reflections:

X_{c} (%) = \frac{A_{c}}{A_{a} + A_{c}} \times 100

where

A

is the integrated area of PE peaks in each pattern, while the subscripts

a

and

c

refer to amorphous and crystalline, respectively.…”

Section: Methodsmentioning

confidence: 99%

Section: Preparation Of Compositesmentioning

confidence: 99%

“…The degree of crystallinity (X c ) was calculated as per Equation (1) 26 considering only the peaks identified as PE reflections:…”

Section: Characterizationmentioning

confidence: 99%

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Thermo‐mechanical properties of polyethylene composites filled with soapstone waste

de Sousa,

Kalantar Mehrjerdi,

Skrifvars

et al. 2023

J of Applied Polymer Sci

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From Waste Vegetable Oil to a Green Compatibilizer for HDPE/PA6 Blends

Cappello,

Strangis,

Cinelli

et al. 2023

Polymers

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When properly compatibilized, the blending of polyethylene (PE) and polyamide (PA) leads to materials that combine low prices, suitable processability, impact resistance, and attractive mechanical properties. Moreover, the possibility of using these polymers without prior separation may be a suitable opportunity for their recycling. In this work, the use of an epoxidized waste vegetable oil (EWVO) was investigated as a green compatibilizer precursor (CP) for the reactive blending of a high-density PE (HDPE) with a polyamide-6 (PA6). EWVO was synthesized from waste vegetable cooking oil (WVO) using ion-exchange resin (Amberlite) as a heterogeneous catalyst. HDPE/PA6 blends were produced with different weight ratios (25/75, 75/25, 85/15) and amounts of EWVO (1, 2, 5 phr). Samples with WVO or a commercial fossil-based CP were also prepared for comparison. All the blends were characterized by scanning electron microscopy (SEM), differential scanning calorimetry (DSC), rheology, and mechanical tests. In the case of HDPE/PA6 75/25 and 85/15 blends, the addition of EWVO at 2 phr showed a satisfactory compatibilizing effect, thus yielding a material with improved mechanical properties with respect to the blend without compatibilizer. On the contrary, the HDPE/PA6 25/75 ratio yielded a material with a high degree of crosslinking that could not be further processed or characterized. In conclusion, the results showed that EWVO had a suitable compatibilizing effect in HDPE/PA6 blends with high HDPE content, while it resulted in unsuitable for blends with high content of PA6.

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Crystallinity and rheology of HDPE/PA12 blends compatibilized with HDPE‐alt‐MAH

Cited by 2 publications

References 65 publications

Thermo‐mechanical properties of polyethylene composites filled with soapstone waste

Thermo‐mechanical properties of polyethylene composites filled with soapstone waste

From Waste Vegetable Oil to a Green Compatibilizer for HDPE/PA6 Blends

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