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 5 publications

(2 citation statements)

References 33 publications

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“…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%

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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: 91%

“…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: Pole Figuressupporting

confidence: 93%

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

View full text Add to dashboard Cite

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Balancing the strength and toughness of polypropylene/carbon nanotube nanocomposites by shear and high‐temperature annealing

Jia

Zhao

et al. 2023

Polymer Composites

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Melt‐mixed polypropylene (PP) and multi‐walled carbon nanotubes (CNTs) are molded by compression molding, conventional injection molding, and interval injection molding (IntM). IntM can provide high‐shear stress promoting the dispersion of CNTs and forming many shish‐kebab structures, which can improve the strength at the cost of toughness. Meanwhile, high‐temperature annealing (HTA) can be finished in 3 min and can release free molecular chains, enhance orientation, and further promote the dispersion of CNTs, thus improving toughness at the expense of strength. Therefore, in this work, IntM and HTA are combined, which can balance and enhance both the toughness and strength of PP‐CNT nanocomposites. For different CNT contents, the enhancement effect also differs. The combined IntM and HTA do not require replacing existing production equipment, so this research can provide a more economical and practical approach to enhancing PP‐CNT nanocomposites.Highlights HTA can be finished in 3 min and promote the dispersion of CNT agglomerates. IntM can enhance the orientation and dispersion of CNTs. Combined IntM and HTA can enhance and balance toughness and strength.

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Improved Yield and Electrical Properties of Poly(Lactic Acid)/Carbon Nanotube Composites by Shear and Anneal

Zhao

Bai

2023

Materials

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Shear and thermal processing can greatly influence nanoparticles’ orientation and dispersion, affecting the nanocomposites’ conductivity and mechanical properties. The synergistic effects of shear flow and Carbon nanotubes (CNTs) nucleating ability on the crystallization mechanisms have been proven. In this study, Polylactic acid/Carbon nanotubes (PLA/CNTs) nanocomposites were produced by three different molding methods: compression molding (CM), conventional injection molding (IM), and interval injection molding (IntM). Solid annealing at 80 °C for 4 h and pre-melt annealing at 120 °C for 3 h was applied to research the CNTs’ nucleation effect and the crystallized volume exclusion effect on the electrical conductivity and mechanical properties. The volume exclusion effect only significantly impacts the oriented CNTs, causing the conductivity along the transverse direction to rise by about seven orders of magnitude. In addition, the tensile modulus of the nanocomposites decreases with the increased crystallinity, while the tensile strength and modulus decrease.

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

Cited by 5 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

Balancing the strength and toughness of polypropylene/carbon nanotube nanocomposites by shear and high‐temperature annealing

Improved Yield and Electrical Properties of Poly(Lactic Acid)/Carbon Nanotube Composites by Shear and Anneal

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