Hydrolytic crack growth and embrittlement in poly(ethylene terephthalate)

Kadoma, Atte; Jiao, Quan; Vlassak, Joost J.; Suo, Zhigang

doi:10.1016/j.jmps.2023.105303

Cited by 6 publications

(3 citation statements)

References 42 publications

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“…3), while the PET sample in the dry condition is still transparent and soft after 20 days of aging, and there is no noticeable difference in appearance between the dry and untreated samples. These changes result in cracking and surface erosion due to oxidative degradation in the amorphous and crystalline components [64]- [66]. Chain scission is one of the primary outcomes of PET photodegradation, leading to increased crystallization and the formation of various degradation products.…”

Section: Effect Of Uv Radiationmentioning

confidence: 99%

Changes in the Chemical Composition of Polyethylene Terephthalate Under UV Radiation in Various Environmental Conditions

Rostampour,

Cook,

Jhang

et al. 2024

Preprint

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Polyethylene terephthalate has been widely used in the packaging industry. Degraded PET micro-nano plastics could pose public health concerns following release into various environments. This study focuses on PET degradation under ultraviolet radiation using the NIST SPHERE facility at the National Institute of Standards and Technology in saturated humidity (i.e., ≥ 95 % relative humidity) and dry conditions (i.e., ≤ 5 % relative humidity) with varying temperatures (30 °C, 40 °C, and 50 °C) for up 20 days. ATR-FTIR was used to characterize the chemical composition change of degraded PET as a function of UV exposure time. The results showed that the cleavage of the ester bond at peak 1713 cm-1 and the formation of the carboxylic acid at peak 1685 cm-1 are significantly influenced by UV radiation. Furthermore, the formation of carboxylic acid was considerably higher at saturated humidity and 50 °C conditions compared to dry conditions. The ester bond cleavage was also more pronounced in saturated humidity conditions. The novelty of this study is to provide insights into the chemical degradation of PET under environmental conditions, including UV radiation, humidity, and temperature. The results can be used to develop strategies to reduce the environmental impact of plastic pollution.

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Section: Effect Of Uv Radiationmentioning

confidence: 99%

Changes in the Chemical Composition of Polyethylene Terephthalate Under UV Radiation in Various Environmental Conditions

Rostampour,

Cook,

Jhang

et al. 2024

Preprint

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show abstract

“…[9] Accurate fracture prediction can lead to the development of more robust hydrogels, minimizing the risk of premature failure and reducing DOI: 10.1002/adts.202300776 the need for frequent replacement or maintenance. Traditionally, the study of hydrogel and hyperelastic material fracture behavior has been conducted through experimental methods, [10][11][12][13] numerical simulations, [14][15][16][17] and the development of theoretical models. [18][19][20][21] Jia et al [11] established a quantitative framework for decomposing the fracture toughness and feature sizes of the crack-tip field, which provides important insights into the underlying toughening mechanism of DN gels.…”

Section: Introductionmentioning

confidence: 99%

“…[ 9 ] Accurate fracture prediction can lead to the development of more robust hydrogels, minimizing the risk of premature failure and reducing the need for frequent replacement or maintenance. Traditionally, the study of hydrogel and hyperelastic material fracture behavior has been conducted through experimental methods, [ 10–13 ] numerical simulations, [ 14–17 ] and the development of theoretical models. [ 18–21 ] Jia et al.…”

Section: Introductionmentioning

confidence: 99%

Fracture Prediction of Hydrogel Using Machine Learning and Inhomogeneous Multiscale Network

Zheng,

You,

Lam

et al. 2024

Advcd Theory and Sims

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Hydrogels are soft polymeric materials with promising applications in biomedical fields. Understanding their fracture behavior is crucial for optimizing device design and performance. However, predicting hydrogel fracture is challenging due to the complex interplay between material properties and environmental factors. In this study, a machine learning (ML) approach to predict hydrogel fracture behavior is presented. A multiscale hydrogel fracture model is developed to generate simulation data, which is used to train a predictive neural network model. The ML model utilizes a hierarchical architecture of convolution long short‐term memory units to capture spatial and temporal dependencies in the data. Model predictions are found to closely match simulation results with high accuracy, demonstrating the ability to learn complex fracture processes. Comparison of crack lengths shows the model can generalize across different material parameters. This work highlights the potential of ML for advancing the understanding of hydrogel fracture and soft matter failure. The presented approach provides an efficient framework for predicting fracture in complex materials and systems.

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Melt‐spun poly(ethylene terephthalate‐co‐1,4‐cyclohexanedimethylene terephthalate) (PETG) copolyester fibers: Synergistic effect of chemical and crystal structure regulation

Zhang,

Yao,

et al. 2024

Polymer Engineering & Sci

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In this work, a series of 1,4‐cyclohexanedimethanol (CHDM)‐based copolyester fibers are prepared by chemical structure design and crystal structure regulation. The chemical structures of poly(ethylene terephthalate‐co‐1,4‐cyclohexanedimethylene terephthalate, (PETG)) copolyesters are first confirmed by 1H‐ and 13C‐nuclear magnetic resonance which indicates that all copolyesters are random copolyesters. Then, the crystallization and melting behavior, thermal stability, and mechanical properties of copolyesters are significantly affected by the CHDM content and CHDM cis‐trans isomerism ratio, showing that trans‐CHDM can effectively improve the comprehensive performance of PETG copolyesters. Besides, the influence of the CHDM monomer (amount and cis‐trans isomerism ratio) and melt‐spinning drawing process on the crystal structure and mechanical properties (tensile strength, elongation) is also investigated by wide‐angle X‐ray diffraction, small‐angle X‐ray scattering, and tensile testing. Especially, the resultant PETG30‐trans80 copolyester fibers exhibit good mechanical properties, and the tensile strength and elongation are 113.9 MPa and 136.5%, respectively. Therefore, our work provides a promising strategy for the fabrication of copolyester fiber.Highlights Bio‐based PETG copolyester was obtained. Synergistic effects of a chemical structure and drawing process of PETG fiber were discussed. The influence of drawing process on crystallization, and orientation of fiber properties was studied.

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Hydrolytic crack growth and embrittlement in poly(ethylene terephthalate)

Cited by 6 publications

References 42 publications

Changes in the Chemical Composition of Polyethylene Terephthalate Under UV Radiation in Various Environmental Conditions

Changes in the Chemical Composition of Polyethylene Terephthalate Under UV Radiation in Various Environmental Conditions

Fracture Prediction of Hydrogel Using Machine Learning and Inhomogeneous Multiscale Network

Melt‐spun poly(ethylene terephthalate‐co‐1,4‐cyclohexanedimethylene terephthalate) (PETG) copolyester fibers: Synergistic effect of chemical and crystal structure regulation

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