Progress in Aromatic Polyimide Films for Electronic Applications: Preparation, Structure and Properties

Wu, Zhenhua; He, Jianxin; Yang, Hanxi; Shen, Yang

doi:10.3390/polym14061269

Cited by 54 publications

(34 citation statements)

References 63 publications

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“…Polyimides, polymers with multiple commercially available representatives, continue to be a class of high-performance polymers of great interest to the scientific community [ 1 , 2 , 3 ]. These polymers are being studied more and more because of their desirable features, including outstanding thermo-oxidative stability, intrinsic flame resistance, distinct electrical characteristics, excellent radiation and solvent resistance, and good mechanical qualities [ 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

Optical and Flame-Retardant Properties of a Series of Polyimides Containing Side Chained Bulky Phosphaphenanthrene Units

Homocianu¹,

Serbezeanu²,

Lisă

et al. 2022

IJMS

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Among the multitude of polymers with carbon-based macromolecular architectures that easily ignite in certain applications where short circuits may occur, polyimide has evolved as a class of polymers with high thermal stability while exhibiting intrinsic flame retardancy at elevated temperatures via a char-forming mechanism. However, high amounts of aromatic rings in the macromolecular backbone are required for these results, which may affect other properties such as film-forming capacity or mechanical properties; thus, much work has been done to structurally derivatize or make hybrid polyimide systems. In this respect, flexible polyimide films (PI(1–4)) containing bulky 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) units have been developed starting from commercial dianhydrides and an aromatic diamine containing two side chain bulky DOPO groups. The chemical structure of PI(1–4)) was characterized by 1H NMR, 13C NMR and 31P NMR spectroscopy. The optical properties, including absorption and luminescence spectra of these polymers, were analyzed. All polyimides containing DOPO derivatives emitted blue light with an emission maxima in the range of 340–445 nm, in solvents such as N,N-dimethylformamide, N-methyl-2-pyrrolidone, chloroform, and N,N-dimethylacetamide, while green light emission (λem = 487 nm for PI-4) was evidenced in a thin-film state. The thermal decomposition mechanism and flame-retardant behavior of the resulting materials were investigated by pyrolysis-gas-chromatography spectrometry (Py-GC), scanning electron microscopy (SEM), EDX maps and FTIR spectroscopy. The residues resulting from the TGA experiments were examined by SEM microscopy images and FTIR spectra to understand the pyrolysis mechanism.

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Section: Introductionmentioning

confidence: 99%

Optical and Flame-Retardant Properties of a Series of Polyimides Containing Side Chained Bulky Phosphaphenanthrene Units

Homocianu¹,

Serbezeanu²,

Lisă

et al. 2022

IJMS

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“…Aromatic polyimides are a class of heterocyclic thermostable polymers used in many high-performance applications due to their unique characteristics such as high thermal and thermo-oxidative stability, high glass transition temperature, superior mechanical properties, good adhesion to substrate, good electrical insulating properties, and high tensile strength. These polymers are used as packaging materials, insulating layers, and polymer composite dielectrics with good thermal stability [ 1 , 2 , 3 , 4 ]. The disadvantages of aromatic polyimides are their infusibility and low solubility in organic solvents, which restrict their applications in many fields of industry.…”

Section: Introductionmentioning

confidence: 99%

Tailoring Thermal and Electrical Properties of Jeffamine Segmented Polyetherimide Composite Films Containing BaTiO3 particles

Hamciuc¹,

Lisă

Serbezeanu³

et al. 2022

Polymers

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The continuous advancement of materials science has highlighted the ongoing need for additional studies on the main composite materials topics, particularly in the field of multifunctional nano-composites, towards improving their capability to meet multifaceted requirements in order to stimulate both scientific and technological development. In this study, we report the preparation and characterization of polyetherimides (PEIs) derived from 4,4′-(4,4′-isopropylidenediphenoxy) bis (phthalic anhydride) following a two-step polycondensation reaction using either 4,4′-(1,3-phenylenedioxy) dianiline, or Jeffamine ED-600 as comonomers, or a mixture of the two diamines. Based on the PEI containing flexible Jeffamine segments, polymer composite films were developed by incorporating BaTiO3 particles. The chemical structure and morphology of the composite films were investigated by FTIR spectroscopy and scanning electron microscopy. Thermal properties were determined by thermogravimetric analysis and differential scanning calorimetry. The influence of Jeffamine segments on the thermal decomposition process was investigated by TG/MS/FTIR measurements under air and nitrogen atmospheres. Based on the obtained data, the thermal decomposition mechanism was established and is discussed in accordance with the chemical structures of the polymers. The surface properties of the PEI and PEI-composite films were characterized by performing contact angle measurements. The addition of BaTiO3 increased the wettability of the surfaces. The dielectric characteristics of polymer composite films were investigated by broad band dielectric spectroscopy measurements. It was noticed that the addition of BaTiO3 nanoparticles to the copolymer matrix gradually enhanced the dielectric constant of the composites.

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“…These polymers have been widely used in many applications in the aerospace industry, machine building, electronics, and biomedical field. They can be applied in the form of films, fibers, coatings, or composites. − However, due to their rigid structure consisting of imide and aromatic rings, fully aromatic polyimides are often infusible and insoluble in organic solvents, which makes their processing very difficult. Much research has been performed in order to improve the processability of aromatic polyimides without significantly diminishing their useful properties.…”

Section: Introductionmentioning

confidence: 99%

Electrospun Copoly(ether imide) Nanofibers Doped with Silver-Loaded Zeolite as Materials for Biomedical Applications

Hamciuc¹,

Vlad‐Bubulac²,

Bercea³

et al. 2022

ACS Appl. Polym. Mater.

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One of the most versatile techniques to fabricate micro-/nanoscaled nonwoven fibrous materials is represented by electrospinning. Due to its easy availability and versatility, increasing efforts worldwide have focused on the preparation of natural and/or synthetic composite membranes that eventually mimic the artificial extracellular matrix. Electrospun composite membranes based on copoly(ether imide)s derived from Jeffamine, and additionally doped with silverloaded zeolite L nanoparticles (ze-Ag + ), have been successfully produced in the present work via a solution electrospinning process. The morphology of the developed electrospun membranes based on pure copoly(ether imide)s (co-PEI-0) and doped copoly(ether imide)s (co-PEI-0/zeolite or co-PEI-0/silver-containing zeolite L nanoparticles) was investigated by scanning electron microscopy (SEM), while the homogeneous distribution of the nanoparticles within the electrospun fibers has been introspected by means of energy dispersive X-ray spectroscopy (EDX). Young's modulus was reduced from 0.677 MPa for pure co-PEI electrospun fibers to 0.221 MPa when silver-loaded zeolite L nanoparticles were attached to the electrospun composite membranes. Antimicrobial activity of the products demonstrated that the samples containing silver-exchanged zeolite L nanoparticles present an inhibitory effect against both Gram-negative (Escherichia coli ATCC 25922) and Gram-positive (Staphylococcus aureus ATCC 25923) bacteria. Furthermore, a biocompatibility check by studying the cell viability and cell morphology of the developed composite membranes revealed no cytotoxic activity.

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Progress in Aromatic Polyimide Films for Electronic Applications: Preparation, Structure and Properties

Cited by 54 publications

References 63 publications

Optical and Flame-Retardant Properties of a Series of Polyimides Containing Side Chained Bulky Phosphaphenanthrene Units

Optical and Flame-Retardant Properties of a Series of Polyimides Containing Side Chained Bulky Phosphaphenanthrene Units

Tailoring Thermal and Electrical Properties of Jeffamine Segmented Polyetherimide Composite Films Containing BaTiO3 particles

Electrospun Copoly(ether imide) Nanofibers Doped with Silver-Loaded Zeolite as Materials for Biomedical Applications

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