The effect of long-term natural aging on the iPB-1 structure and the II – I phase transformation rate

Kaszonyiova, M.; Rybnikář, F.; Lapčík, Ľubomír; Vilčáková, Jarmila

doi:10.1016/j.polymdegradstab.2020.109437

Cited by 2 publications

(1 citation statement)

References 34 publications

(51 reference statements)

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“…Despite its excellent properties, the application of PB-1 compared to other polyolefins is limited by conformational polymorphism and dimensional instability, reaching up to 4%, which occurs during the transition between the initial metaphase II and stable phase I. The individual phases exhibit different densities [2][3][4]. Four crystalline phases of PB-1 have been characterized thus far.…”

Section: Introductionmentioning

confidence: 99%

The degradation of poly(1-butene) extrudates subjected to artificial and natural aging

Zenzingerova,

Kudlacek,

Benicek

et al. 2024

Iran Polym J

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In this work, we examined the degradation behavior of isotactic poly(1-butene) (PB-1) under artificial aging and natural weathering conditions. PB-1 samples underwent accelerated aging through UV irradiation and natural weathering. Chemical and structural changes in the degraded samples were characterized using Fourier-transform infrared–attenuated total reflectance (FTIR–ATR) spectroscopy, surface analysis, and wide-angle X-ray scattering (WAXS). The mechanical properties were evaluated via tensile testing. FTIR–ATR analysis revealed the presence of carbonyl groups in the degraded samples, indicating oxidative degradation. Surface observations employing scanning electron microscopy (SEM) revealed the formation of surface cracks in both samples, with differing crack initiation mechanisms. The two aging methods affected the mechanical properties of the samples: artificial aging induced a gradual reduction in both tensile modulus and strength, whereas natural weathering engendered a marginal increment in modulus alongside diminished strength. Additionally, elongation-at-break value witnessed a marked decrease in both sample sets during the preliminary stages of degradation. This work employed accelerated time equivalent, obtained by juxtaposition of the values of carbonyl index during both artificial aging and natural weathering and their interpolation to determine the degradation rate and adequately to correlate the final properties of the aged PB-1. It was observed that surface morphology and mechanical attributes of degraded samples were subject to additional influences such as temperature, humidity, and precipitation during natural weathering. This research work provided significant insights into PB-1 degradation mechanisms and effect of different aging conditions on its performance. Graphical abstract

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Section: Introductionmentioning

confidence: 99%

The degradation of poly(1-butene) extrudates subjected to artificial and natural aging

Zenzingerova,

Kudlacek,

Benicek

et al. 2024

Iran Polym J

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Research insight into the change of aggregation structure of BOPP films and its influence on electrical properties under accelerated thermal aging

Zhang,

Liu

et al. 2024

J of Applied Polymer Sci

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Biaxially oriented polypropylene (BOPP) film used in pulse film capacitors withstands high temperatures for a long time. This leads to frequent faults in pulse film capacitors, affecting the reliability of the pulse system. In this paper, the thermal aging tests of BOPP films at 100°C for 10–80 days are carried out in this paper, and the physicochemical and electrical properties of the aging materials are characterized. The results show that more deep and shallow traps to BOPP films are introduced during the thermal aging process. With the increase in aging time, the breakdown field strength gradually decreases, and the conductivity decreases first and then increases. Under the action of thermal aging for a long time, the recrystallization of materials and the destruction of molecular chains by thermal aging are the main reasons for the increase of traps and the decrease of breakdown field strength. The former is dominant in the early stage of aging, and the latter is dominant in the late stage of aging. Therefore, the conductivity shows the law of slow decrease first and then rapid increase. The relevant research provides a theoretical foundation for the process improvement and life prediction of BOPP films.

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The effect of long-term natural aging on the iPB-1 structure and the II – I phase transformation rate

Cited by 2 publications

References 34 publications

The degradation of poly(1-butene) extrudates subjected to artificial and natural aging

The degradation of poly(1-butene) extrudates subjected to artificial and natural aging

Research insight into the change of aggregation structure of BOPP films and its influence on electrical properties under accelerated thermal aging

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