The effect of β-nucleating agent on the self-nucleation of isotactic polypropylene

Yang, Yue; Sha, Xuan; Wang, Fushan; Gao, Yan; Zhang, Liangliang; Wang, Xinxin; Feng, Jiachun

doi:10.1016/j.polymer.2021.124009

Cited by 7 publications

(3 citation statements)

References 55 publications

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“…It is not an easy thing to obtain a PP with a high content of β-crystals. In addition, during induction growth and processing, β-crystals may be transformed into α-, γ-, or even mesophase crystals [ 123 , 124 , 125 ] under different shear force and thermal conditions. How one is to improve the nucleation efficiency of β-crystals and obtain a high content of β-crystal polypropylene has always been the direction of people’s efforts.…”

Section: Nucleating Efficiency Of β-Crystalsmentioning

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: Nucleating Efficiency Of β-Crystalsmentioning

confidence: 99%

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

Xiulin

et al. 2023

Polymers

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“…Regarding the varying k β with the matrix chain structure, it is now widely accepted that the insertion of comonomer in PPR disrupts the chain regularity, leads to an unfavorable β-growth kinetically, and results in decreased k β . − Generally, the α- and β-phases in iPP have different temperature-dependent growth rates. β-Phase is kinetically favorable in a certain temperature range T ** – T * , between which β-phase has a higher growth rate with respect to α-phase. , For PPH, this temperature range is approximately 100–140 °C, where the crystallization process happens to be carried out, ,, so that a high k β can be easily achieved. In contrast, Varga and Schulek-Tóth found that the upper critical temperature T * in PPR shifted to a lower temperature, as such restricting the formation of β-phase.…”

Section: Introductionmentioning

confidence: 99%

“…β-Phase is kinetically favorable in a certain temperature range T**−T*, between which β-phase has a higher growth rate with respect to α-phase. 22,23 For PPH, this temperature range is approximately 100−140 °C, where the crystallization process happens to be carried out, 8,9,24 so that a high k β can be easily achieved. In contrast, Varga and Schulek-Toth found that the upper critical temperature T* in PPR shifted to a lower temperature, 19 as such restricting the formation of β-phase.…”

Section: Introductionmentioning

confidence: 99%

Toward a Further Understanding of the Decreased β-Phase Content in β-Nucleated Polypropylene Random Copolymer: From Nucleation and Growth Kinetics

Sha,

Yue,

Tie

et al. 2023

ACS Appl. Polym. Mater.

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Compared with polypropylene homopolymer (PPH), β-nucleating agent (β-NA) usually induces less β-phase in polypropylene random copolymer (PPR) with comonomer inserted. A widely held view is that unfavorable β-growth kinetically caused by the insertion of comonomer contributes to a decreased relative content of β-phase (k β) in PPR. To further understand the decreased k β in PPR, we separately investigated the nucleation and growth behavior of various isotactic polypropylenes (iPPs) nucleated with a β-NA, N,N′-dicyclohexylterephthalamide (DCHT). With the aid of fractionated crystallization, the possibility of DCHT to form β-nuclei, i β/i, is calculated to be reduced in PPR with ethylene inserted, demonstrating fewer β-nuclei induced. As for growth, it is found that the insertion of comonomer decreases the relative growth rate of β-phase (G β/G α) and weakens the kinetic advantage of β-growth. The study reveals that both i β/i and G β/G α decrease with the insertion of comonomer. Fewer β-nuclei induced by DCHT and the subsequent unfavorable β-growth simultaneously contribute to the final decreased k β. Our fundamental insight provides a more comprehensive understanding of the decreased k β as comonomer is inserted into the iPP chain and could have important implications in the control of the polymorphism of polymers.

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Self-nucleation Effect of Crystallization with Various Nucleating Agents

Zhang,

Zhao,

et al. 2023

Chin J Polym Sci

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The effect of β-nucleating agent on the self-nucleation of isotactic polypropylene

Cited by 7 publications

References 55 publications

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

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

Toward a Further Understanding of the Decreased β-Phase Content in β-Nucleated Polypropylene Random Copolymer: From Nucleation and Growth Kinetics

Self-nucleation Effect of Crystallization with Various Nucleating Agents

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