Further improved mechanical properties of polypropylene by shish‐kebab structure and high‐temperature annealing

Mi, Dashan; Zhao, Zhongguo; Jia, Shiru

doi:10.1002/pen.26108

Cited by 6 publications

(5 citation statements)

References 33 publications

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“…Despite this fact, it can be deduced that the observed behavior is due to matrix orientation in the prepreg. 40 , 41 This result is consistent with the previous confirmation of the matrix orientation.…”

Section: Resultssupporting

confidence: 93%

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Achieving High-Performance Green Composites from Pineapple Leaf Fiber–Poly(butylene succinate) through Both Fiber Alignment and Matrix Orientation across the Thickness

Duangsuwan,

Amornsakchai,

Phinyocheep

et al. 2023

ACS Omega

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This research aims to develop high-performance and low-carbon composites using biobased poly(butylene succinate) (PBS) reinforced with well-aligned pineapple leaf fibers (PALF). PBS/PALF composites containing 10 and 20% PALF by weight (wt %) were prepared using a two-roll mill. During the mixing process, the molten material was slightly stretched to align the fibers in the machine direction, forming a uniaxial prepreg. The prepreg was subsequently stacked and compressed into composite sheets at compression temperatures of 120 and 140 °C. Differential scanning calorimetry, X-ray diffraction, and crystalline morphology analysis revealed the presence of matrix orientation in the prepreg, which was preserved in sheets compressed at 120 °C but not at 140 °C. The composites prepared at 120 °C exhibited significantly higher flexural strength and modulus compared to those prepared at 140 °C, attributed to the combined effect of matrix and PALF orientation. Additionally, the composites displayed an increase in heat distortion temperature, with a maximum of 10 °C higher than the matrix melting temperature (∼113 °C) for the composite with 20 wt % PALF. These findings indicate the potential for increased utilization of this low-carbon green composite.

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Section: Resultssupporting

confidence: 93%

“…Surprisingly, the average tensile moduli in the two directions are not significantly different and the value in LD is even smaller. Despite this fact, it can be deduced that the observed behavior is due to matrix orientation in the prepreg. , This result is consistent with the previous confirmation of the matrix orientation.…”

Section: Resultssupporting

confidence: 91%

Achieving High-Performance Green Composites from Pineapple Leaf Fiber–Poly(butylene succinate) through Both Fiber Alignment and Matrix Orientation across the Thickness

Duangsuwan,

Amornsakchai,

Phinyocheep

et al. 2023

ACS Omega

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show abstract

“…For example, the modulus of 6IntM was higher than that of 6IM and 6CM. In general, within the higher CNTs content, higher M ori always brought a higher strength and modulus [ 32 ]. As a result, the tensile strength of 4IntM was 13% higher than that of 0CM, while the tensile modulus of 5IntM was 35% higher than that of 0CM.…”

Section: Resultsmentioning

confidence: 99%

Effects of Orientation and Dispersion on Electrical Conductivity and Mechanical Properties of Carbon Nanotube/Polypropylene Composite

Zhao

Bai

2023

Polymers

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The orientation and dispersion of nanoparticles can greatly influence the conductivity and mechanical properties of nanocomposites. In this study, the Polypropylene/ Carbon Nanotubes (PP/CNTs) nanocomposites were produced using three different molding methods, i.e., compression molding (CM), conventional injection molding (IM), and interval injection molding (IntM). Various CNTs content and shear conditions give CNTs different dispersion and orientation states. Then, three electrical percolation thresholds (4 wt.% CM, 6 wt.% IM, and 9 wt.% IntM) were obtained by various CNTs dispersion and orientations. Agglomerate dispersion (Adis), agglomerate orientation (Aori), and molecular orientation (Mori) are used to quantify the CNTs dispersion and orientation degree. IntM uses high shear to break the agglomerates and promote the Aori, Mori, and Adis. Large Aori and Mori can create a path along the flow direction, which lead to an electrical anisotropy of nearly six orders of magnitude in the flow and transverse direction. On the other hand, when CM and IM samples already build the conductive network, IntM can triple the Adis and destroy the network. Moreover, mechanical properties are also been discussed, such as the increase in tensile strength with Aori and Mori but showing independence with Adis. This paper proves that the high dispersion of CNTs agglomerate goes against forming a conductivity network. At the same time, the increased orientation of CNTs causes the electric current to flow only in the orientation direction. It helps to prepare PP/CNTs nanocomposites on demand by understanding the influence of CNTs dispersion and orientation on mechanical and electrical properties.

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“…However, in SSP samples, the molecular chains are oriented at an angle to the applied force direction, making them more susceptible to chain slippage under stress, resulting in a reduction in tensile strength. Previous experiments have also indicated that while higher orientation enhances tensile strength in the direction of orientation, it can lead to reduced strength in other directions, causing the tensile strength of SSP samples to be lower than that of CSP samples [25]. rPET serves as a stress concentration point in rPP, and the poor interfacial compatibility between them results in a substantial reduction in tensile strength.…”

Section: Resultsmentioning

confidence: 99%

Direct 3D Printing of Recycled PET/PP Granules by Shear Screw Extrusion

Mi,

Zhang,

Zhou

et al. 2023

Polymers

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This article introduces a one-step extrusion-based fused deposition modeling (FDM) approach for the challenging separation of polypropylene (PP) and polyethylene terephthalate (PET) during recycling. A shear screw printer (SSP) with shear elements was designed, and it was compared to a conventional single-screw printer (CSP) to investigate the differences in print stability, degradation levels, tensile performance, molecular orientation, and crystallization when preparing recycled PP and recycled PET blends. Although the retention effect of the SSP screw slightly increases the degradation of the blended rPP/rPET, the strong shear (2.6 × 104 s−1) applied near the extrusion exit improves the blending efficiency. The SSP also enhances molecular orientation, modulus of the parts, and reduces performance fluctuations. Additionally, the SSP has the potential to simplify the recycling process, enabling the transformation of blended recycled materials into products with just one melt process.

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Further improved mechanical properties of polypropylene by shish‐kebab structure and high‐temperature annealing

Cited by 6 publications

References 33 publications

Achieving High-Performance Green Composites from Pineapple Leaf Fiber–Poly(butylene succinate) through Both Fiber Alignment and Matrix Orientation across the Thickness

Achieving High-Performance Green Composites from Pineapple Leaf Fiber–Poly(butylene succinate) through Both Fiber Alignment and Matrix Orientation across the Thickness

Effects of Orientation and Dispersion on Electrical Conductivity and Mechanical Properties of Carbon Nanotube/Polypropylene Composite

Direct 3D Printing of Recycled PET/PP Granules by Shear Screw Extrusion

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