Pressure, hydrolytic degradation and plasticization drive high temperature blistering failure in moisture saturated polyimides

Xu, Yadong; Zehnder, Alan T.

doi:10.1016/j.eml.2017.09.002

Cited by 7 publications

(3 citation statements)

References 22 publications

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“…Several experimental and computational studies were also dedicated to the chemical (especially hydrolytic) degradation or aging of common or less conventional PIs and model compounds [143,[151][152][153]. Two main mechanisms were evidenced: hydrolytic degradation and water-induced plasticization, both of them being thermally activated and severely time-dependent (long exposure times [month scale] are usually involved).…”

Section: Hydrolytic Degradationmentioning

confidence: 99%

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New High-Performance Materials: Bio-Based, Eco-Friendly Polyimides

Rusu¹,

Abadie²

2021

Polyimide for Electronic and Electrical Engineering Applications

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The development of high-performance bio-based polyimides (PIs) seems a difficult task due to the incompatibility between petrochemical-derived, aromatic monomers and renewable, natural resources. Moreover, their production usually implies less eco-friendly experimental conditions, especially in terms of solvents and thermal conditions. In this chapter, we touch some of the most significant research endeavors that were devoted in the last decade to engineering naturally derived PI building blocks based on nontoxic, bio-renewable feedstocks. In most cases, the structural motifs of natural products are modified toward amine functionalities that are then used in classical or nonconventional methods for PI synthesis. We follow their evolution as viable alternatives to traditional starting compounds and prove they are able to generate eco-friendly PI materials that retain a combination of high-performance characteristics, or even bring some novel, enhanced features to the field. At the same time, serious progress has been made in the field of nonconventional synthetic and processing options for the development of PI-based materials. Greener experimental conditions such as ionic liquids, supercritical fluids, microwaves, and geothermal techniques represent feasible routes and reduce the negative environmental footprint of PIs' development. We also approach some insights regarding the sustainability, degradation, and recycling of PI-based materials.

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Section: Hydrolytic Degradationmentioning

confidence: 99%

“…In its early stages, plasticization can be cautiously reversed with no significant impact upon thermal or mechanical features. Further on, water induces irreversible hydrothermal defects like blistering and/or delamination [153]. The process is stronger when high temperatures or pressures are involved [152,154].…”

Section: Hydrolytic Degradationmentioning

confidence: 99%

New High-Performance Materials: Bio-Based, Eco-Friendly Polyimides

Rusu¹,

Abadie²

2021

Polyimide for Electronic and Electrical Engineering Applications

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“…[14][15] Meanwhile, polymers are lightweight and malleable, but most of the current polymer-based composites still face problems with poor mechanical properties, such as high-temperature softening, cryogenic brittleness, and poor thermal shock resistance. [16] Therefore, it is crucial to find a material with excellent mechanical properties, remarkable functionalities, and resistance to extreme environment.…”

Section: Introductionmentioning

confidence: 99%

Nacre‐Inspired Bacterial Cellulose/Mica Nanopaper with Excellent Mechanical and Electrical Insulating Properties by Biosynthesis

et al. 2023

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The exploration of extreme environments has become necessary for understanding and changing nature. However, the development of functional materials suitable for extreme conditions is still insufficient. Herein, a kind of nacre‐inspired bacterial cellulose (BC)/synthetic mica (S‐Mica) nanopaper with excellent mechanical and electrical insulating properties that has excellent tolerance to extreme conditions is reported. Benefited from the nacre‐inspired structure and the 3D network of BC, the nanopaper exhibits excellent mechanical properties, including high tensile strength (375 MPa), outstanding foldability, and bending fatigue resistance. In addition, S‐Mica arranged in layers endows the nanopaper with remarkable dielectric strength (145.7 kV mm−1) and ultralong corona resistance life. Moreover, the nanopaper is highly resistant to alternating high and low temperatures, UV light, and atomic oxygen, making it an ideal candidate for extreme environment‐resistant materials.

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Hydrothermal aging of polyimide film

Braun

Nam

Mata

et al. 2022

J of Applied Polymer Sci

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The hydrothermal aging of a commercial polyimide film, (poly[pyromellitic dianhydride‐co‐4,4′‐oxydianiline]) is investigated, providing further insight into the well‐known loss of properties that can occur for these materials in the presence of moisture. The study involved measuring ATR‐FTIR, ultimate tensile strength, and percent elongation at break, under accelerated hydrothermal aging conditions at three different temperatures (70, 80, and 90°C). ATR‐FTIR data was analyzed using chemometrics in order to identify significant trends that develop upon the accelerated aging conditions. The most dramatic changes were observed for the aging at 90°C. Changes in the ATR‐FTIR spectra for aging at all three temperatures can be attributed to hydrolysis of the imide groups. Ultimate tensile strength was also used to monitor the hydrothermal aging process. This data was used to construct an Arrhenius plot from which an activation energy of 71.8 KJ/mol was determined for the hydrothermal aging process. This value is comparable to that of textiles used in fire protective clothing, suggesting that polyimide is a viable candidate for modeling the degradation of these textiles. This paper also shows the large potential of chemometrics for polymer aging studies as it allows identifying degradation mechanisms from subtle chemical changes in the materials.

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Pressure, hydrolytic degradation and plasticization drive high temperature blistering failure in moisture saturated polyimides

Cited by 7 publications

References 22 publications

New High-Performance Materials: Bio-Based, Eco-Friendly Polyimides

New High-Performance Materials: Bio-Based, Eco-Friendly Polyimides

Nacre‐Inspired Bacterial Cellulose/Mica Nanopaper with Excellent Mechanical and Electrical Insulating Properties by Biosynthesis

Hydrothermal aging of polyimide film

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