Effect of stretch ratio on the induced crystallinity and mechanical properties of biaxially stretched PET

Onyishi, H.O.; Oluah, Chukwumaobi K.

doi:10.1080/01411594.2020.1813291

Cited by 13 publications

(9 citation statements)

References 27 publications

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“…Biaxial tension is not only an advanced composite manufacturing process, but also a deformation mode in other processing methods, such as blow film extrusion (Espinosa et al, 2016) and thermoforming (Mayoral et al, 2021). Moreover, the use of biaxial stretching in changing the structure, dispersion, and orientation of neat polymer materials to enhance performance has been widely studied for polymers including biaxially oriented polypropylene (Xing et al, 2019), biaxially oriented polyethylene (Chen et al, 2020), and biaxially oriented polyethylene terephthalate (Onyishi and Oluah, 2020). However, there is significantly less research on the performance and applications of biaxially oriented polymer nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

Biaxial Stretching of Polymer Nanocomposites: A Mini-Review

et al. 2021

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Polymer nanocomposites with excellent physical and chemical properties and multifunctional performance have been widely used in various fields. Biaxial stretching is not only an advanced film manufacturing process, but also a deformation mode in other processing methods such as blow film extrusion and thermoforming. In recent research, high-performance polymer nanocomposites have been fabricated via sequential and simultaneous biaxial stretching. This fabrication method enhances the mechanical properties, optical performance, and thermal properties of polymer nanocomposites by changing the structure or orientation of materials during the process of stretching. Therefore, it is particularly suitable for use in optimizing material performance and preparing thin films with excellent properties in the packaging industry. With the emergence of new materials and technologies, polymer nanocomposites prepared by biaxial stretching have demonstrated multifunctional properties and their range of applications has further expanded. In this mini-review, the effect of biaxial stretching on the structure and properties of nanocomposites based on various nanofillers is discussed and applications are summarized. In addition, the challenges and future prospects of this technology are analyzed. The presented work will be beneficial for improving preparation processes and improving future research for the production of high-performance polymer nanocomposites.

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Section: Introductionmentioning

confidence: 99%

Biaxial Stretching of Polymer Nanocomposites: A Mini-Review

et al. 2021

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“…35 It was reported that biaxially stretched PET film showed enhanced mechanical properties from strain-induced crystallization in which molecular chains were aligned. [36][37][38] Onyishi and Oluah observed that stretching above the glass transition temperature increased the tensile strength and elastic modulus, 37 and Stroupe et al found that stretched PET film could reduce the content of gauche ethylene glycol (EG) and increase the content of trans EG promoting the formation of straight polymer chains. 34 Zekriardehani et al investigated that as the stretching ratio increased, the density and chain alignment increased, resulting in improved crystallinity.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of PET recyclability and characterization of modified reprocessed‐PET for industrial application

Kim,

Park,

Choo

et al. 2024

J of Applied Polymer Sci

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Polyethylene terephthalate (PET) is used in a variety of packaging applications, such as bottles, films, fibers, for its cost‐effective and excellent physical properties. However, the increase in plastic usage and packaging waste has become major global problems. Therefore, the importance of plastic recycling is being emphasized. In this study, the bottle‐grade PET was repeatedly melt processed up to three times to evaluate of PET recyclability. Intrinsic viscosity (IV) and mechanical properties have significantly decreased due to chain scission during the melt reprocessing. In particular, the IV of 3rP (reprocessing three times) decreased to 0.582 dL/g, and the mechanical properties decreased more than twice compared with 0rP. To enhance the physical properties of reprocessed PET (rP‐PET), it was modified using two chain extenders. The IV of the modified 3rP‐PET increased from 0.645 to 0.737 dL/g. And the tensile strength was improved up to approximately 93% of the 0rP properties, confirming the chain extension effect. Additionally, a biaxial orientation process was applied to confirm the feasibility of modified rP‐PET to various industrial packaging applications. Consequently, as the stretching ratio increased, the physical properties of modified rP‐PET improved, confirming the feasibility of rP‐PET in various packaging fields.

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“…5,6 Under this complex condition, the microstructural morphology of PET greatly changes from preform to the final bottle. 1,[7][8][9][10] As a consequence, the mechanical behavior of PET, which is strongly related to the microstructural morphology of the material changes: rigidity or strength are multiplied by two or three in regard of the characteristics of the preform. 9 Many researches [1][2][3][4][5][6][11][12][13][14][15][16][17][18][19] have been carried out to capture the PET behavior during the SBM process: the experimental research 2,[11][12][13] provides the data to assess the accuracy of the numerical simulation.…”

Section: Introduction: State Of Art On Isbm Modelingmentioning

confidence: 99%

“…The SBM process exhibits high temperature, high strain rate, and large multiaxial strain 5,6 . Under this complex condition, the microstructural morphology of PET greatly changes from preform to the final bottle 1,7–10 . As a consequence, the mechanical behavior of PET, which is strongly related to the microstructural morphology of the material changes: rigidity or strength are multiplied by two or three in regard of the characteristics of the preform 9 .…”

Section: Introduction: State Of Art On Isbm Modelingmentioning

confidence: 99%

In situ adjustment of a visco hyper elastic model for stretch blow molding process simulation of poly‐ethylene terephthalate bottles

Luo,

Tantchou Yakam,

Charlot

et al. 2023

Polymer Engineering & Sci

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Simulation of the stretch blow molding (SBM) process necessitates to develop a model able to reproduce the material behavior at high strain rate, large deformation with temperature gradient. On the other hand, both the need to understand polyethylene terephthalate (PET) material characteristics and the final bottle performance requirements continue to get higher. That necessitates a regular update of the identification of the model. Bottle producers are interested by managing this identification without a specific complex apparatus not available in an industrial context. The work presented here describes an in‐situ adjustment process for upgrading all parameters of a visco‐hyperelastic (VHE) model from a small number of blowing tests that do not necessitate complex equipment. The accuracy of the adjustment process is validated through the ability of the updated VHE model to reproduce the final shape, the pressure evolution and the tension of the rod during an industrial blowing of PET bottles.

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Effect of stretch ratio on the induced crystallinity and mechanical properties of biaxially stretched PET

Cited by 13 publications

References 27 publications

Biaxial Stretching of Polymer Nanocomposites: A Mini-Review

Biaxial Stretching of Polymer Nanocomposites: A Mini-Review

Evaluation of PET recyclability and characterization of modified reprocessed‐PET for industrial application

In situ adjustment of a visco hyper elastic model for stretch blow molding process simulation of poly‐ethylene terephthalate bottles

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