Effect of β-nucleating agent on crystallization of post-consumer polypropylene

Zhu, Kun; Ding, Qian; Hua, Chaoran; Fu, Hao; Yao, Jin

doi:10.1016/j.tca.2019.03.017

Cited by 13 publications

(6 citation statements)

References 30 publications

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“…This indicates that an increase in the β‐crystal content can increase the crystallization temperature of PP within a certain range. [ 51 ] However, with increasing the inorganic filler content, the T c values of PP composites move toward the low temperature (Figure 8C) because of the gradual increase of β‐crystal content. Combining the calculated results of crystallinity by XRD and DSC listed in Table 2, it is concluded that the agglomeration effect caused by the increase of LDH and CaHA content hinders the diffusion movement of PP molecular chains in the crystallization region, which reduces the crystallinity of PP composites and affects T c of samples.…”

Section: Resultsmentioning

confidence: 99%

Synergistic effect of β‐nucleating agent and layered double hydroxide on high toughness of polypropylene composites

Guo

Chen

Guo³

et al. 2023

Polymer Engineering & Sci

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The crystalline behaviors and micromorphology of polymers have a large impact on the physical and mechanical properties, especially for polypropylene (PP) composites with toughening effect. In this work, the changes of the content ratio for layered double hydroxide (LDH) and β-nucleating agent (CaHA), mechanical properties, and crystallization behaviors of PP/ethylene vinyl acetate copolymer (EVA)/LDH ternary composites are investigated by differential scanning calorimeter (DSC), polarizing optical microscopy (POM), scanning electron microscopy (SEM), and notched impact strength testing. The CaHA is used for synergistic toughening with LDH, and the highest notched impact strength is achieved in the 6PEL2 sample with CaHA of 0.03 phr and LDH of 5.70 phr, which is about 100% higher than that of pure PP. It is found from the crystallization behaviors and SEM images of the composites that 6PEL2 has the highest relative content of β-crystals and the appearance of rougher interface and deformation pullout of the EVA phase in 6PEL2 because of dislocations in the β-crystals and the formation of a large number of cavities absorbing the impact energy.

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Section: Resultsmentioning

confidence: 99%

Synergistic effect of β‐nucleating agent and layered double hydroxide on high toughness of polypropylene composites

Guo

Chen

Guo³

et al. 2023

Polymer Engineering & Sci

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“…Specifically, WBG‐F shows the best effectiveness for improving the T c of i PB by 12.9 °C. The presence of WBG‐F may induce the chain segment of i PB to have a high free activation energy and to arrange in a regular way at a higher temperature in the process of cooling, being more beneficial for forming a perfect crystal 26 . However, the α‐NAs have a small or negative effect on the thermal properties of i PB.…”

Section: Resultsmentioning

confidence: 99%

Thermomechanical properties of poly(1‐butene) synthesized by Ziegler–Natta catalyzed polymerization of 1‐butene in the presence of nucleating agents

Cui

et al. 2020

Polymer International

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Isotactic poly(1-butene)s (iPBs) were synthesized via bulk polymerization of 1-butene in the presence of a series of nucleating agents (NAs). The effects of the NAs on the polymerization, crystallization and mechanical properties of the resultant iPBs were systematically investigated. Both ⊍and ⊎-NAs effectively improve the impact resistance of iPB. Specifically, the addition of ⊎-NAs increases the molecular weight, tensile strength, elastic and flexural moduli of iPB without affecting catalytic activity during polymerization, while the ⊍-NAs have no affirmative effect on improving the tensile strength and elastic modulus of iPB. The ⊎-NAs also accelerate the crystal transition rate of iPB from form II to form I.

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“…As a representative linear dielectric, polypropylene exhibits five different crystalline phases, namely, α, β, γ, δ, and quasi-hexagonal, with the monoclinic α phase being the most common and thermodynamically stable crystalline structure. − The α phase is formed through nucleation at the center, radiating outward along the radial direction, resulting in the establishment of spherulites characterized by substantial size and distinct boundaries. Conversely, the β phase grows in a divergent bundle-like structure along the radial direction through the single crystal nucleation.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Energy Storage Properties of Polypropylene through Crystallization Modulation

Zhu,

Chen,

Pan

et al. 2024

ACS Appl. Polym. Mater.

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Polypropylene (PP), renowned for its high breakdown strength (E), low dielectric loss (tan δ), and excellent selfhealing properties, is widely utilized as the state-of-the-art dielectric polymer in power capacitors and green electric vehicles. However, the low dielectric constant (K) and limited discharged energy density (U e ) of polypropylene hinder the development of dielectric capacitors in miniaturization and integration. Here, a scalable polypropylene-based dielectric film with excellent energy storage properties comprising the lanthanide functional fillers (WBG) has been prepared using a melt extrusion process. Remarkably, the composite film with only 0.10 wt % of WBG demonstrates a high U e of 7.05 J/cm 3 and an ultrahigh charge−discharge efficiency (η) of 99.6% at 581.6 MV/m, coupled with long-term cyclic dielectric stability. The enhanced energy storage properties have been systematically analyzed and attributed to the formation of the βcrystalline phase and enhanced polarization induced by WBG. In a practical application demonstration, dielectric capacitors constructed from extruded composite films display stronger brightness, exhibiting a higher capacity than pure PP capacitors. This work provides a strategy to fabricate polypropylene dielectric films with excellent energy storage properties on an industrial scale.

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Effect of β-nucleating agent on crystallization of post-consumer polypropylene

Cited by 13 publications

References 30 publications

Synergistic effect of β‐nucleating agent and layered double hydroxide on high toughness of polypropylene composites

Synergistic effect of β‐nucleating agent and layered double hydroxide on high toughness of polypropylene composites

Thermomechanical properties of poly(1‐butene) synthesized by Ziegler–Natta catalyzed polymerization of 1‐butene in the presence of nucleating agents

Enhanced Energy Storage Properties of Polypropylene through Crystallization Modulation

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