Combined effect of chemically compound graphene oxide‐calcium pimelate on crystallization behavior, morphology and mechanical properties of isotactic polypropylene

Zhang, Yuefei; Lin, Xiangfeng; Hu, Hui

doi:10.1002/pat.4950

Cited by 7 publications

(2 citation statements)

References 51 publications

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“…The SEM observations clearly demonstrate the favorable compatibilization effect of graphene on the iPP/ABS blend. Some recent studies in the literature also demonstrated the improved dispersion of nucleating agents in iPP by using graphene 55,56 . The ABS dispersed phase of iPP/ABS/0.3G blend is the smallest and the distribution is more uniform.…”

Section: Resultsmentioning

confidence: 93%

Well dispersion of poly(acrylonitrile‐butadiene‐styrene) in isotactic polypropylene mediated by incorporation of graphene and the elevated toughness

Liu

Zhang

Fang

2021

Polymers for Advanced Techs

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Polymers with benzene rings in structures including polystyrene (PS) and poly(acrylonitrile‐butadiene‐styrene) (ABS) could function as rigid organic particles and macromolecular β nucleating agents to toughen isotactic polypropylene (iPP), and the toughening effect mainly depends on their dispersibility in iPP matrix. In this work, a third component of graphene (G) was introduced into the iPP/PS and iPP/ABS blends, respectively, to mediate the dispersibility of these polymers in the iPP via melt blending. Selective dispersion of graphene in these immiscible blends has been investigated with SEM, DSC, and a rheometer. It was interesting to obtain a more favorable dispersion of ABS in the iPP/ABS/G blend compared with the iPP/ABS blend, and the corresponding toughness showed a prominent improvement accompanied with an elevation in rigidity. The underlying mechanism for the improved dispersion of ABS in the iPP/ABS/G blends has been discussed in detail. However, because of a better affinity of the graphene to the PS than the iPP matrix, graphene could only locate in the PS phase, resulting in poor compatibilization for the iPP/PS blend followed by the deterioration of mechanical properties.

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Section: Resultsmentioning

confidence: 93%

Well dispersion of poly(acrylonitrile‐butadiene‐styrene) in isotactic polypropylene mediated by incorporation of graphene and the elevated toughness

Liu

Zhang

Fang

2021

Polymers for Advanced Techs

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“…under a nitrogen atmosphere. According to previous studies [46], the decomposition process of CaPim manifests in three distinct mass loss stages. The mass loss of 38.5% observed at 145-340 • C is attributed to the evaporation of crystalline-bonded water and organic molecules.…”

Section: Mechanical Behaviormentioning

confidence: 81%

Structural Characteristics and Improved Thermal Stability of HDPE/Calcium Pimelate Nanocomposites

Samiotaki,

Tarani,

Karavasili

et al. 2024

Macromol

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In the present research work, calcium pimelate (CaPim) was synthesized and investigated as an additive for high-density polyethylene (HDPE). HDPE/CaPim nanocomposites were prepared by melt-mixing, with CaPim content ranging from 0.1% to 1%, affording white homogeneous materials. The chemical structure of the nanocomposites and the incorporation of CaPim was confirmed by infrared spectroscopy. The surficial morphology and the additive distribution were examined by scanning electron microscopy. Differential scanning calorimetry and X-ray diffraction measurements showed that the thermal transitions and crystal structure of HDPE are not affected by the incorporation of CaPim, while the mechanical properties are retained overall. This study focuses on the thermal degradation of HDPE nanocomposites, investigating the degradation mechanism and kinetic parameters through various analytical methods. Isoconversional techniques, including the Friedman method, Vyazovkin analysis, and Ozawa Flynn Wall analysis, were employed to calculate activation energies (Eα). The degradation mechanism and kinetic triplet were determined based on a multivariate non-linear regression method (model-fitting). Finally, the presence of a CaPim additive was shown to increase the Eα of thermal degradation, consistent with the calculated dependence of Eα on the degree of conversion and the improved thermal stability of the HDPE matrix.

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The Synergistic Effect of Rare‐Earth Complex Nucleating Agent and Graphene Oxide on the Non‐Isothermal Crystallization Behavior of iPP Originating From the Diverse Self‐Assembly Morphology

Shi

Chang

et al. 2020

Macro Chemistry & Physics

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Rare‐earth nucleating agent (WBG‐II) is a kind of additive for isotactic polypropylene (iPP), which will dissolve into iPP melt during heating and re‐aggregate into diverse morphologies during cooling through self‐assembly. However, up to now, little work about the influence of graphene oxide (GO) on the self‐assembly of WBG‐II can be found. Results in this study suggest that via the hydrogen‐bond interaction, GO can provide additional nuclei for WBG‐II during self‐assembly. Consequently, during non‐isothermal crystallization, WBG‐II and GO present a synergistic effect rather than a superposition effect on the crystallization onset temperature (Tc‐on), the crystallization peak temperature (Tc‐peak), the crystallization half time (t1/2), and the relative content of β‐iPP (Kβ), especially when the final heating temperature (Tf) is higher than 240 °C. Specifically, as Tf is lower than 220 °C, Tc‐on, Tc‐peak, t1/2, and Kβ are insensitive to the weight concentration of GO‐ODA (ϕG), since that little WBG‐II is dissolved into iPP melt and the morphology of WBG‐II is changed only very slightly; as Tf is higher than 240 °C, Tc‐on, Tc‐peak, and Kβ first decrease to a minimum value with increasing of ϕG, and then increase when ϕG exceeded 0.2%.

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Combined effect of chemically compound graphene oxide‐calcium pimelate on crystallization behavior, morphology and mechanical properties of isotactic polypropylene

Cited by 7 publications

References 51 publications

Well dispersion of poly(acrylonitrile‐butadiene‐styrene) in isotactic polypropylene mediated by incorporation of graphene and the elevated toughness

Well dispersion of poly(acrylonitrile‐butadiene‐styrene) in isotactic polypropylene mediated by incorporation of graphene and the elevated toughness

Structural Characteristics and Improved Thermal Stability of HDPE/Calcium Pimelate Nanocomposites

The Synergistic Effect of Rare‐Earth Complex Nucleating Agent and Graphene Oxide on the Non‐Isothermal Crystallization Behavior of iPP Originating From the Diverse Self‐Assembly Morphology

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