Effects of nanocrystallization on surface migration of polypropylene/slip agent composites in accelerated aging

Won, Joong Sun; Lee, Jae Min; Lee, Pil Gyu; Choi, Hyeong Yeol; Kwak, Tae Joon; Lee, Seung Koo

doi:10.1007/s10853-021-06694-4

Cited by 3 publications

(1 citation statement)

References 38 publications

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“…Therefore, it is necessary to investigate the migration behavior of polymer additives and analyze the research results. We previously demonstrated that slip agents rapidly migrate to the surface by thermal aging, degrading the appearance quality and scratch resistance of PP composites [31]. In this study, we focus on the relationship between the crystalline behavior and temperature, and the migration of additives from the internal amorphous regions to the external surface of the specimen.…”

Section: Introductionmentioning

confidence: 99%

Microstructure-Crystallization Correlation with Surface Migration of Additives in High-Crystallinity Polypropylene Composites

Lee

2023

JTSFT

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This study aims to describe the crystallization structure and surface migration in polypropylene (PP) composites containing lubricants and talc during 0-72 h at 70 ℃ of accelerated thermal aging. The particles exposed on the surfaces of PP composites after accelerated aging are caused by lubricant components and certain types of talc migrating to the surface. This additive-migration phenomenon is found to be correlated to the surface migration of additives with the occurrence of secondary crystallization in PP composites owing to accelerated aging, which increases the heat of fusion, crystallinity, and nanocrystalline size. The accelerated aging evaluation method for PP composites adopted in this study reveals that the microstructure, crystallinity, crystal size, and heat of fusion are correlated. The findings of this study can be applied for improving the appearance and quality of composite products

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Section: Introductionmentioning

confidence: 99%

Microstructure-Crystallization Correlation with Surface Migration of Additives in High-Crystallinity Polypropylene Composites

Lee

2023

JTSFT

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Aging-Resistant Breakdown Performance of Polypropylene Nanodielectrics

Azmi,

Lau,

Wei Tan

et al. 2024

IEEE Trans. Dielect. Electr. Insul.

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Evaluation of Processing Conditions in the Performance of Purging Compounds for Polypropylene Injection Molding

Carrasco

Guerrero

Lazo

et al. 2023

JMMP

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Purging is a fundamental process in the injection molding sector, aiding in color transition, material shifts, and the removal of contaminants. The purging compounds can be classified according to physical or chemical mechanisms and are affected by processing parameters, such as temperature, pressure, or soaking period. Despite some studies on the effect of processing parameters in purging action, an analysis of the rheological behavior and physico-chemical changes is still required for a deeper understanding of this type of system. This study explored shear viscosity, activation energy behavior in the torque rheometer, injection molding process, and energy consumption for two polyolefin-based purging compounds: one on polypropylene (PP) and another on polyethylene (PE). The results showed that the PP-based compound is a highly viscous material with low thermal sensibility and low energy consumption. The PE-based chemical compound, which includes an expanding and scrubbing agent, presented higher thermal sensitivity. Lower purging times and specific energy consumption were observed for the mechanical purge regardless of the processing temperature in the injection molding machine. However, torque and specific total mechanical energy differed due to viscosity and possible filler particle agglomeration. These findings demonstrated the influence of processing temperature on rheology and performance. Nonetheless, further studies regarding pressure, soaking time, and rheological modeling are recommended.

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Effects of nanocrystallization on surface migration of polypropylene/slip agent composites in accelerated aging

Cited by 3 publications

References 38 publications

Microstructure-Crystallization Correlation with Surface Migration of Additives in High-Crystallinity Polypropylene Composites

Microstructure-Crystallization Correlation with Surface Migration of Additives in High-Crystallinity Polypropylene Composites

Aging-Resistant Breakdown Performance of Polypropylene Nanodielectrics

Evaluation of Processing Conditions in the Performance of Purging Compounds for Polypropylene Injection Molding

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