The effects of varied imidization conditions on rubbed polyimide film surface morphology

Devlin, C. L. H.; Chiang, S.; Russell, Thomas P.

doi:10.1002/app.20528

Cited by 4 publications

(3 citation statements)

References 17 publications

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“…Moreover, a low imidization temperature using a base catalyst such as 1,4-diazobicyclo[2.2.2]octane (DABCO) and 1,8-diazabicyclo [5.4.0]undec-7-ene (DBU) to prepare composite films effectively improved mechanical properties, which can reduce the elimination of functional groups on GNS at high temperatures. 17,18 We also demonstrated that the water vapor permeability of composite films decreased significantly by 74% compared to that of pure PI.…”

Section: ■ Introductionmentioning

confidence: 75%

“…APGNS can not only improve homogeneous dispersion in a polar solvent but also enhance mechanical properties while maintaining high electrical conductivity, owing to covalent bonding between the PI matrix and the GNS. Moreover, a low imidization temperature using a base catalyst such as 1,4-diazobicyclo[2.2.2]octane (DABCO) and 1,8-diaza-bicyclo[5.4.0]undec-7-ene (DBU) to prepare composite films effectively improved mechanical properties, which can reduce the elimination of functional groups on GNS at high temperatures. , We also demonstrated that the water vapor permeability of composite films decreased significantly by 74% compared to that of pure PI.…”

Section: Introductionmentioning

confidence: 76%

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Mechanically Strong and Multifunctional Polyimide Nanocomposites Using Amimophenyl Functionalized Graphene Nanosheets

et al. 2013

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We report an effective way to fabricate mechanically strong and multifunctional polyimide (PI) nanocomposites using aminophenyl functionalized graphene nanosheet (APGNS). APGNS was successfully obtained through a diazonium salt reaction. PI composites with different loading of APGNS were prepared by in situ polymerization. Both the mechanical and electrical properties of the APGNS/ PI composites were significantly improved compared with those of pure PI due to the homogeneous dispersion of APGNS and the strong interfacial covalent bonds between APGNS and the PI matrix. The electrical conductivity of APGNS/PI (3:97 w/w) was 6.6 × 10 −2 S/m which was about 10 11 times higher than that of pure PI. Furthermore, the modulus of APGNS/PI was increased up to 16.5 GPa, which is approximately a 610% enhancement compared to that of pure PI, and tensile strength was increased from 75 to 138 MPa. The water vapor transmission rate of APGNS/PI composites (3:97 w/w) was reduced by about 74% compared to that of pure PI. ■ INTRODUCTIONAromatic polyimide (PI) is a high-performance polymer with applications in the fields of microelectronics, optoelectronics, adhesives, and aerospace owing to its high thermal stability and favorable chemical and mechanical properties. 1,2 However, PI has a few limitations, such as electrostatic accumulation, poor heat dissipation, and low electrical conductivity for special applications. In recent years, much attention has been paid to PI composites with carbon nanomaterials because the incorporation of carbon nanofillers can effectively enhance the thermal, mechanical, and electrical properties of the nanocomposites. 2−6 Graphene, a one-atom-thick planar sheet of carbon atoms densely packed in a honeycomb crystal lattice, 7 has revolutionized the scientific frontiers of nanoscience and condensed matter physics due to its exceptional electrical, 8 physical, 9 and chemical properties. 10 The excellent properties of graphene have opened new pathways for developing a wide range of novel functional materials. In addition, graphene has a distinctive mechanical property with fracture strains of ∼25% and a Young's modulus of ∼1 TPa. 9 However, poor dispersion in organic solvents and weak interfacial interactions between graphene and the polymer matrix limit the widespread use of graphene. In contrast, graphene oxide (GO) produced by the oxidation of graphite can solve these issues. It is easily dispersed in water and polar solvents due to the functional groups, such as ketones, diols, epoxides, hydroxyls, and carbonyl, on its edges and basal planes. 11 Nevertheless, GO has limited compatibility with certain polymers and limited solubility in hydrophobic solvent owing to its hydrophilic nature, which can reduce the reinforcement effects of interfacial interaction in the polymer matrix. 12,13 Therefore, the key issue is to improve both the homogeneous dispersion and strong interfacial interaction between the polymer matrix and graphene for the development of high performance polymer/graphene nanocomposites. R...

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Section: ■ Introductionmentioning

confidence: 75%

Section: Introductionmentioning

confidence: 76%

Mechanically Strong and Multifunctional Polyimide Nanocomposites Using Amimophenyl Functionalized Graphene Nanosheets

et al. 2013

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“…It can be clearly seen that the surface became rougher with increasing imidization temperature, creating a distinctive surface structure [10]. This indicates that the films of PAA and fully cured PI have comparable roughness and thickness uniformity; i.e.…”

Section: Atomic Force Microscopy (Afm)mentioning

confidence: 88%

Synthesis and characterization of polyimide thin films obtained by thermal evaporation and solid state reaction

Al-Ajaj

Kareem

2016

Materials Science-Poland

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In this research polyimide films were prepared by physical vapor deposition (PVD), using solid state reaction of pyromellitic dianhydride (PMDA) and p-phenylene diamine (PDA) to form poly(amic acid) (PAA) films. The resultant films were converted to polyimide by thermal treatment, usually below 300 • C. For this study, a FT-IR spectrometer has been used to measure the effect of imidization temperature on the chemical structure of the vapor-deposited thin films of aromatic PI. When temperature increased, an increase in all absorption peaks was observed. This suggests that residual PAA monomers continued to be converted into PI. The surface topology of the PI films obtained at imidization temperatures of 150, 200, 250 • C for 1 hour was further examined by using AFM atomic force microscopy. It can be clearly seen that the surface became rougher with increasing imidization temperature. The thermal stability of polyimide was also studied by using thermogravimetric analysis (TGA).

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Micro- to nanoscale surface morphology and friction response of tribological polyimide surfaces

Samyn

Schoukens

Baets

2010

Applied Surface Science

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The effects of varied imidization conditions on rubbed polyimide film surface morphology

Cited by 4 publications

References 17 publications

Mechanically Strong and Multifunctional Polyimide Nanocomposites Using Amimophenyl Functionalized Graphene Nanosheets

Mechanically Strong and Multifunctional Polyimide Nanocomposites Using Amimophenyl Functionalized Graphene Nanosheets

Synthesis and characterization of polyimide thin films obtained by thermal evaporation and solid state reaction

Micro- to nanoscale surface morphology and friction response of tribological polyimide surfaces

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