The influence of melt status and beta-nucleation agent distribution on the crystallization of isotactic polypropylene

Chen, Pujing; Xu, Min; Li, Xiangyang; Han, Yu; Ding, Jianjun; Lin, Yongxing; Liu, Gang; Zhang, Xian; Chen, Lin; Tian, Xingyou

doi:10.1039/d1ce01660a

Cited by 6 publications

(3 citation statements)

References 65 publications

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“…The induction mechanisms of β-nucleating agents mostly conform to a heterogeneous nucleation mechanism. The dispersion of a β-nucleating agent [ 64 ] in the matrix and orientation structure (or ordered structure) of a polymer melt [ 65 ] are two key factors that affect the formation of β-crystals. The former affects nucleation sites, while the latter determines β-crystal growth.…”

Section: Preparation Strategies Of β-Ppmentioning

confidence: 99%

β-Nucleated Polypropylene: Preparation, Nucleating Efficiency, Composite, and Future Prospects

Xiulin

et al. 2023

Polymers

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The β-crystals of polypropylene have a metastable crystal form. The formation of β-crystals can improve the toughness and heat resistance of a material. The introduction of a β-nucleating agent, over many other methods, is undoubtedly the most reliable method through which to obtain β-PP. Furthermore, in this study, certain newly developed β-nucleating agents and their compounds in recent years are listed in detail, including the less-mentioned polymer β-nucleating agents and their nucleation characteristics. In addition, the various influencing factors of β-nucleation efficiency, including the polymer matrix and processing conditions, are analyzed in detail and the corresponding improvement measures are summarized. Finally, the composites and synergistic toughening effects are discussed, and three potential future research directions are speculated upon based on previous research.

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Section: Preparation Strategies Of β-Ppmentioning

confidence: 99%

β-Nucleated Polypropylene: Preparation, Nucleating Efficiency, Composite, and Future Prospects

Xiulin

et al. 2023

Polymers

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“…[15,16] Also, the 𝛽-form is favored by the presence of a temperature gradient, [14,17] a flow field, [17,18] or by adding a nucleating agent during crystallization. [19,20] The 𝛾-iPP is favored during crystallization under elevated pressure or when the isotactic sequence length is interrupted. [21,22] However, it is quite rare.…”

Section: Introductionmentioning

confidence: 99%

Evolution of the Deformation‐ and Flow‐Induced Crystallization and Characterization of the Microstructure of a Single Spherulite, Lamella, and Chain of Isotactic Polypropylene

Sharaf,

Kloczkowski

2023

Macro Chemistry & Physics

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Isotactic polypropylene (iPP) is a frequently used polymer in industrial processing and scientific research, used as a model material. This review highlights some current and forefront issues in polymer science and engineering. This review alludes to classical deformation schemes to interpret the complicated deformation in isotactic polypropylene as a semicrystalline polymer. Also, due to the complex hierarchical structures of crystallized polymers, we are concerned mainly with the progress on the multi‐scale and multi‐stage microstructural evolution covering each deformation stage from the initiation of plasticity until failure, particularly in terms of crystalline morphology changes. Specifically, the characterization of the microstructure evolution of a single spherulite, lamella, and chain of isotactic polypropylene will be emphasized and mentioned. Here, we are most interested in the results obtained from stretching (strain‐induced) orientation and crystallization studies accompanied by the in situ scattering and spectroscopy techniques offering a detection window from nano to micrometer scale, which should be able to reflect the microstructural changes at different length scales of interest.During polymer processing, the melts are frequently subjected to shear or/and elongation flow fields, producing flow‐induced molecular chain orientation in the melt. The oriented molecular chains crystallize differently than those encountered under quiescent conditions. Thus, orientation‐induced crystallization has long been an object of intense interest. A vast body of research was reported about the effects of preorientation on the crystallization of various polymers. Among them, iPP is most frequently studied since its diversified structure and morphology are very sensitive to changes in processing conditions and molecular parameters.This article is protected by copyright. All rights reserved

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“…When used in different end-use domains, good crystallization property and mechanical properties for PP are generally required during mold processing. From the industrial application point of view, PP can be modified by various methods to expand its range of application [ 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

Exploitation of a New Nucleating Agent by Molecular Structure Modification of Aryl Phosphate and Its Effect on Application Properties of the Polypropylene

Lin,

Zhang,

Zhao

et al. 2023

Polymers

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In this work, a novel α-nucleating agent (NA) for polypropylene (PP) termed APAl-3C-12Li was prepared and evaluated compared with the commercially available type NA-21. For the synthesis of the organophosphate-type NA (APAl-3C), the -OH group of the acid part of NA-21 was substituted by the isopropoxy group. The structure of APAl-3C was analyzed by spectroscopy and element analysis, the results of which were consistent with the theoretical molecular formula. APAl-3C’s thermal stability was studied by differential scanning calorimetry (DSC) and thermogravimetry (TG), which showed only weak mass loss below 230 °C, meaning that it would not decompose during the processing of PP. The APAl-3C-12Li was used as a novel nucleating agent, studying its effects on crystallization, microstructure, mechanical and optical properties. Tests were performed in a PP random copolymer at different contents, in comparison to the commercial NA-21. The composite with 0.5 wt% APAl-3C-12Li has a similar crystallization temperature of 118.8 °C as with the addition of 0.5 wt% NA-21. An advantage is that the composite with the APAl-3C-12Li has a lower haze value of 9.3% than the counterpart with NA-21. This is due to the weaker polarity of APAl-3C-12Li after the introduction of methyl and better uniform dispersion in the PP matrix, resulting in stronger improvement of optical and mechanical properties.

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The influence of melt status and beta-nucleation agent distribution on the crystallization of isotactic polypropylene

Abstract: Although being investigated extensively in past decades, the factors affecting β-crystallization in β-nucleating agent/iPP composites have not been identified completely. In this study, β-crystallization in mesomorphic melt and free melt...

Cited by 6 publications

References 65 publications

β-Nucleated Polypropylene: Preparation, Nucleating Efficiency, Composite, and Future Prospects

β-Nucleated Polypropylene: Preparation, Nucleating Efficiency, Composite, and Future Prospects

Evolution of the Deformation‐ and Flow‐Induced Crystallization and Characterization of the Microstructure of a Single Spherulite, Lamella, and Chain of Isotactic Polypropylene

Exploitation of a New Nucleating Agent by Molecular Structure Modification of Aryl Phosphate and Its Effect on Application Properties of the Polypropylene

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