Nanoscale blending of aliphatic and aromatic polyimides: A clue for forming semi-molecular composites and in-situ generation of copolyimide fractions

Ha, Youri; Kim, Youngkyoo; Ha, Chang‐Sik

doi:10.1007/s00289-007-0818-1

Cited by 14 publications

(4 citation statements)

References 21 publications

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“…These results are in good agreement with earlier studies on PI/silica hybrids. [38][39][40][41] Characteristics of the PMDA-ODA PI/a-SHS Hybrid Films. The optical properties of the hybrid films were characterized using UV-visible transmittance spectroscopy (Figure 8).…”

Section: Synthesis Of Ps Templates and Amino-functionalized Silica Homentioning

confidence: 99%

“…The thermal stability of organic polymers can also be enhanced by introducing inorganic materials, such as silica, because these materials have a good thermal stability. [34][35][36][37][38][39][40][41][42][43] Dynamic mechanical analysis (DMA) was used to study the influence of the SHS phase in the molecular relaxation processes of the PMDA-ODA PI. As shown in Figure 11, the neat PMDA-ODA PI film and all the PMDA-ODA PI hybrid films exhibited two transition peaks in the tan δ curves, one small peak around 200 o C and another strong peaks in the range of 250~500 o C. In Figure 11, the DMA data for the PMDA-ODA PI/a-SHS hybrids containing 1 wt% and 3 wt% are not shown since no significant difference has been observed from that of the neat PMDA-ODA PI.…”

Section: Synthesis Of Ps Templates and Amino-functionalized Silica Homentioning

confidence: 99%

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Synthesis and characterization of hybrid films of polyimide and silica hollow spheres

Lee

Choi

2011

Macromol. Res.

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Hybrid films were prepared with pyromellitic dianhydride (PMDA)/4,4'-oxydianiline (ODA) polyimide (PMDA-ODA PI) and amino-modified silica hollow spheres (a-SHS). Scanning electron microscopy confirmed the formation of silica hollow spheres without aggregation or deformation. Thermogravimetric analyses showed that the thermal stability of the hybrid films was superior to those of the neat PMDA-ODA PI films. The dielectric constant of the PMDA-ODA PI films was reduced from 3.33 to 2.24 for a hybrid film containing 5 wt% silica hollow spheres. On the other hand, when the content of silica hollow spheres was > 7 wt%, the dielectric constant increased due to the aggregation and collapse of silica hollow spheres. The tensile properties of the hybrid films degraded with increasing a-SHS content compared to those of the neat PMDA-ODA PI film, whereas they were still sufficient for applications as a low-k passivation coating material.

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Section: Synthesis Of Ps Templates and Amino-functionalized Silica Homentioning

confidence: 99%

Section: Synthesis Of Ps Templates and Amino-functionalized Silica Homentioning

confidence: 99%

Synthesis and characterization of hybrid films of polyimide and silica hollow spheres

Lee

Choi

2011

Macromol. Res.

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“…[7][8][9][10][11][12]. To surpass these difficulties, one plausible method is to insert function groups as linkage to the aromatic chain that could render the polymer flexibility and/or to attach bulky function groups to the noncoplanar sides of the aromatic chain that may interfere with the aromatic stacking [13][14][15]. As reported by other researchers, the insertion of flexible aliphatic sequences in the rigid aromatic PI chain could lead to products possessing properties from both and could serve as a good strategy in designing new PI related copolymers that will meet various requirements [16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Novel Synthesis of Polyimide Foams with Aromatic and 1,6-Diaminohexane Imide Bonding

Chen

Whang

et al. 2022

Advances in Polymer Technology

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A novel type of polyimide foams (PIFs) with chemically inserted flexible aliphatic diamine (1,6-diaminohexane (HMDA)) segments was successfully synthesized and characterized in this research. The aliphatic HMDA segments were randomly incorporated in the long chain aromatic imide bonds. The obtained PIFs containing various HMDA contents (0 to 20 mol%) exhibited different morphologies such as lowered density and larger cell diameter (with higher HMDA content), and open cell ratio was increased as well. HMDA rendered flexibility to the copolymer leading to decreased rigidity. Compared to using 4,4 ′ -oxydianiline (ODA) as the sole diamine source, incorporating low cost of HMDA would increase the PIF’s flexibility and improve its processibility while making the production more cost effective. Within some range of compromised thermal and mechanical properties, this proposed method could be feasible for industrial applications.

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“…[13][14][15][16][17][18] Since the introduction of molecular composite concept, a variety of polymers has been employed to make molecular composites due to their promising synergistic effect on the physical properties of each component. [19][20][21][22][23] Most of them are prepared by mixing rigid rod-like polymers, as a reinforcing component, and flexible coil-like polymers as a binding matrix. The previous studies showed that the resulting molecular composites improved environmental resistance, thermal stability, toughness, and electronic and optical properties.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and properties of rigid rod-like polyimide/flexible coil-like poly(amide-imide) molecular composite films

Choi

Kim

et al. 2010

Macromol. Res.

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We report the microstructure and properties of polyimide molecular composite films fabricated from a rigid rod-like polyimide [poly(pyromellitic dianhydride-p-phenylene diamine) (PMDA-PDA PI)] and a flexible coil-like poly(amide-imide) [poly(trimellitic anhydride chloride-4,4'-oxydianiline) (TMAC-ODA PAI)]. The molecular composite films were prepared by the thermal imidization of precursor molecular composite films consisting of soluble precursors of PMDA-PDA PI and TMAC-ODA PAI. The microstructure of the polyimide/ poly(amide-imide) molecular composite films was characterized by infrared spectroscopy and X-ray diffraction. The thermal, optical, dielectric, and mechanical properties of the molecular composite films were examined using a thermogravimetric analyzer, differential scanning calorimeter, prism coupler, impedance analyzer, and universal testing machine. The results showed that the molecular composite films exhibited a single glass transition, indicating good compatibility between the two components. However, most of the properties showed a nonlinear trend with the compositions in the presence of a critical point at PMDA-ODA PI/TMAC-ODA PAI = 40/60 (wt/wt).

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Nanoscale blending of aliphatic and aromatic polyimides: A clue for forming semi-molecular composites and in-situ generation of copolyimide fractions

Cited by 14 publications

References 21 publications

Synthesis and characterization of hybrid films of polyimide and silica hollow spheres

Synthesis and characterization of hybrid films of polyimide and silica hollow spheres

Novel Synthesis of Polyimide Foams with Aromatic and 1,6-Diaminohexane Imide Bonding

Microstructure and properties of rigid rod-like polyimide/flexible coil-like poly(amide-imide) molecular composite films

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