Effect of annealing on microstructure and tensile properties of polypropylene cast film

Ren, Yueming; Zhang, Hao; Wang, Shaojie; Liu, Jianye; Gao, Dali; Wu, Changjiang; Zhang, Shijun

doi:10.1007/s00396-017-4220-8

Cited by 7 publications

(4 citation statements)

References 28 publications

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“…This can be observed both on model samples from FSC or other quenching experiments and on practical components from processing with high cooling rate like films or fibers . Specifically in cast films, the transformation occurs without superstructure changes resulting in different (nodular) structure and higher transparency even for the final α‐phase .…”

Section: Processing‐based Modificationsmentioning

confidence: 94%

Designing polymer crystallinity: An industrial perspective

Mileva

Tranchida

Gahleitner

2018

Polymer Crystallization

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More than 50% of the thermoplastic polymers applied globally are semi‐crystalline, making crystallization part of the material and component design process for these materials. The mechanical and optical performance, but also the long‐term stability of the final articles and applications will depend upon three major groups of influence factors: Polymer structure and monomer composition, additive addition (especially nucleation) and blending with secondary components, and processing parameters. In the present review, we try to establish a connection between these three areas, the resulting combination of crystallinity and morphology, and the final application properties. Examples are drawn from the two major polyolefins, polyethylene and polypropylene, technical polymers like polyamide and polyester, but also polymers from renewable sources like poly(lactic acid).

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Section: Processing‐based Modificationsmentioning

confidence: 94%

Designing polymer crystallinity: An industrial perspective

Mileva

Tranchida

Gahleitner

2018

Polymer Crystallization

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“…The mechanical properties of a polymer are temperature and strain-dependent, which is referred to as the temperature [89] and mechanical history of the polymer, including Mullins effect [19] (p. 585), [72] (p. 563), [71]. Generally, during thermal treatment, the polymer crystallinity increases, e.g., annealing [90] and mechanical deformation [81] (p. 49). Damper made of TPE material and compressed to a deformation of 50% is characterized by the increase in modulus of elasticity, dissipated energy and the plastic component of deformation (Figure 7a,b).…”

Section: Post-printing Treatmentmentioning

confidence: 99%

Personalized Anti-Vibration Protection for Telematics Devices in Urban Freight Transport Vehicles

Wojnowski

Chmiel

2021

Energies

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Vibrations are a major cause of human health disorders, circuit boards and machinery damage. Vibration dampers are considered to be the best option to counter these issues. Three-dimensional printing techniques play an increasingly important role in manufacturing small polymer parts with tailored properties. Thermoplastic elastomers (TPE) constitute a perfect material for manufacturing small-scale series absorber prototypes due to their thermoplastic nature, good elasticity and damping properties. This paper proposes a novel multi-level approach to the design and manufacturing process, e.g., the first level—selection of material; second level—decision about the geometry of a damper; third—selection of technological printing parameters; fourth—post-printing treatment. This work primarily aims to overview the design and manufacturing process levels. The impact of each step on the damping capacity of small absorbers is assessed. It was found that thermoplastic elastomers and fused deposition modeling (FDM) have huge potential in shaping the physical properties of small, elastomeric absorbers. It was assessed that at every step of the multilevel design and manufacturing process (MDMP), the designer could tailor the damping to meet the desired criteria of a final product: a cylinder-shaped hollow damper that can be made from TPE polymer without post-printing treatment and is characterized by good damping.

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“…XLPE is a typical semi-crystalline polymer whose temperature-sensitive microstructure dominates its thermal and electrical properties [7]. For commercial XLPE cables, the microstructure of XLPE can't reach a thermodynamic equilibrium state in the short period of the manufacturing process [8]. Many studies on retired cables that operated for decades have revealed a phenomenon in which many retired cables maintain better thermal and electrical properties than new cables [9], [10], because the cables have gone through an annealing process during cable operation with elevated temperatures promoted molecular chain movement and favor the emergence and growth of new crystals and the rearrangement of the crystal-amorphous region [9]- [11].…”

Section: Introductionmentioning

confidence: 99%

Rejuvenation of Retired Power Cables by Heat Treatment: Experimental Simulation in Lab

et al. 2020

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In this work, heat treatment was performed on three retired 110 kV AC cables with service years of 0, 15 and 30, and the effects on the thermal and electrical performance of the cable insulation were investigated. First, each cable with a length approximately of 5 m was prepared and cut into five equal segments. Four segments of each cable were annealed at a temperature of 90, 95, 100, or 105 • C by building a small circuit to simulate cable operation. Then, a section at the middle of each segment was cut out, and the insulation layer was peeled away. The peeled-off layers from the inner, middle and outer positions were selected as the test samples. Subsequently, Fourier transform infrared spectrometry (FTIR), and differential scanning calorimetry (DSC) were performed, and the DC conduction current and dielectric breakdown strength were measured. The best thermal properties of the highest melting point, crystallinity, and smallest melting range were found when the cables were annealed at 100, 105, and 105 • C for the inner, middle, and outer positions, respectively. The highest dielectric breakdown strength and lowest electrical conductivity were found at temperatures of 95 or 100 • C for the inner and middle positions, respectively, and at 105 • C for the outer position. The FTIR results showed that thermal annealing for hundreds of hours did not adversely affect the molecular chains. It is found that this type of heat treatment could be a feasible method to rejuvenate retired cables, and a conservative temperature of 95 • C is regarded as the optimum annealing temperature. INDEX TERMS Cable, DSC, melting point, crystallinity, electrical conductivity, dielectric breakdown strength.

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Effect of annealing on microstructure and tensile properties of polypropylene cast film

Cited by 7 publications

References 28 publications

Designing polymer crystallinity: An industrial perspective

Designing polymer crystallinity: An industrial perspective

Personalized Anti-Vibration Protection for Telematics Devices in Urban Freight Transport Vehicles

Rejuvenation of Retired Power Cables by Heat Treatment: Experimental Simulation in Lab

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