Structure–property relationships for partially aliphatic polyimides

Kumar, Sushil; Yu, Hwan Chul; Choi, Ji-Young; Kudo, Kazuaki; Jang, Yong Hoon; Chung, C.

doi:10.1007/s10965-010-9513-2

Cited by 40 publications

(31 citation statements)

References 22 publications

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“…The solubility and transparency of the fully alicyclic homopolyimides are higher than those of 2-containing partially alicyclic polyimides. 12,24 This can mainly be attributed to lower degree of intermolecular interactions between the polyimide chains composed of the alicyclic dianhydride (2) and diamines, when compared to the partially alicyclic polyimides derived from 2 and aromatic diamines. On the other hand, 5b-0 showed higher solubility and optical transparency than 5a-0.…”

Section: Resultsmentioning

confidence: 99%

Nanoporous thin films of fully alicyclic polyimides

Kumar

Song

et al. 2011

Macromol. Res.

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Nanopore generation could be accomplished in thin films of fully alicyclic polyimides derived from an alicyclic dianhydride and diamines. A silylation method for the alicyclic diamines was used to synthesize high molecular weight alicyclic polyimides. Triblock copolyimides were prepared using N-silylated alicyclic diamines, alicyclic dianhydride, and a thermally labile polymer. Nanoporous films of fully alicyclic polyimides were prepared through heating of the copolyimide films to induce thermal degradation of the labile block.

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Section: Resultsmentioning

confidence: 99%

Nanoporous thin films of fully alicyclic polyimides

Kumar

Song

et al. 2011

Macromol. Res.

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“…This result may be due to the unique unsymmetrical spiro structure of DAn, which can effectively enhance polyimide solubility. 24,26,27 It should be noted that the fluorine-containing dianhydride (6FDA) reacted with AnDA to give an insoluble gel.…”

Section: Articlementioning

confidence: 99%

“…The high transparency of the partially aliphatic polyimide may be attributed to low degree of conjugation and CT complex resulting from the aliphaticity and unsymmetrical spiro structure of the DAn unit. 24,26,27 The high transmittance suggests that the ITO/PI-DAn-AnDA/ITO/glass device has a suitable configuration for use in fully transparent electronic devices. The inset in Figure 2(b) shows the ITO/PIDAn-AnDA/ITO/glass device covering a printed design to demonstrate their high transparency.…”

Section: Fabrication and Transparency Of Polyimidebased Memory Devicesmentioning

confidence: 99%

“…[23][24][25] Here, an alicyclic dianhydride, rel-(1'R,3S,5'S)-spiro[furan-3(2H),6'- [3]oxabicyclo[3.2.1]octane]-2,2' ,4' ,5(4H)-tetrone (DAn) (Scheme 1), was employed because it has been shown that the incorporation of DAn unit into polyimide results in enhanced transparency and solubility of the polyimide due to its nonaromaticity and unsymmetrical spirocyclic structure. 24,26,27 On the other hand, an anthracene moiety was introduced into the polyimide backbone to confer two different conductive states (ON and OFF) to the polyimide. 15,28,29 In this work another strategy for preparing a fully transparent polymer memory device was the usage of indium tin oxide (ITO) electrodes as both top and bottom electrodes (TE and BE).…”

Section: Introductionmentioning

confidence: 99%

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Fully transparent nonvolatile resistive polymer memory

Kim

Lee

et al. 2015

J. Polym. Sci. Part A: Polym. Chem.

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We present a fully transparent nonvolatile resistive polymer memory device based on an anthracene-containing partially aliphatic polyimide along with indium tin oxide (ITO) top and bottom electrodes. High transmittance of over 90% in the wavelength range of 400 to 800 nm is accomplished with an ITO/polyimide/ITO/glass device. The device shows unipolar write-once-read-many times (WORM) memory behavior with an ON/OFF current ratio of 2 3 10 3 , and the ratio remained without any significant degradation for over 10 4 s. The memory behavior of the device is considered to be governed by trap-controlled space-charge limited conduction (SCLC) and local filament formation. Based on molecular simulation of the polyimide, the location of energy states is different from that in the conventional charge transfer (CT) mechanism. Despite the relatively low ON/OFF current ratio, our results can give insight into the development of fully transparent memory device.

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“…Although soluble polyimides can be obtained from alicyclic dianhydride or diamine monomers, as is well known, introduction of some groups, such as flexible ether and acyclic linkages, etc., to the polyimide backbones will sacrifice their thermal stability and mechanical properties [14,15]. It has been proved that introduction of rigid heteroaromatic pyridine ring to the polymer backbone could endow it excellent thermal stability, which should be useful to decrease the negative effects resulted from the introduction of flexible ether linkages in the polyimides backbone [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Study on preparation and properties of novel reactive phenolic hydroxyl-containing polyimides

et al. 2012

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Novel reactive polyimides (PIs) containing phenolic hydroxyl functionalities were prepared from 4-(4-hydroxyphenyl)-2,6-bis[3-(4-aminophenoxy)phenyl]pyridine (m,p-HAPP) with various aromatic dianhydrides via one-step polycondensation procedure. The inherent viscosities of the PIs were 0.54-0.63 dL/g in DMF solution and most of them were readily soluble in common organic solvents such as DMF, DMAc, NMP, and m-Cresol, etc. Meanwhile, the PIs also had good thermal stability, with the glass transition temperature (T g ) of 221.7-310.5°C, the temperature at 10 % weight loss of 524.1-579.3°C in nitrogen atmosphere. Then commercial epoxy resin was cured in the presence of different ratios of the reactive polyimide, giving a series of polyimide modified epoxy films. Thermogravimetric analysis showed the increase of the temperature at 5 % weight loss of the films with the increase of the polyimide content; 296°C for 0 %, 309°C for 1.95 %, 337°C for 3.85 % and 350°C for 5.63 %.

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Structure–property relationships for partially aliphatic polyimides

Cited by 40 publications

References 22 publications

Nanoporous thin films of fully alicyclic polyimides

Nanoporous thin films of fully alicyclic polyimides

Fully transparent nonvolatile resistive polymer memory

Study on preparation and properties of novel reactive phenolic hydroxyl-containing polyimides

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