Synthesis and characterization of high-barrier polyimide containing rigid planar moieties and amide groups

Liu, Jun-Jie; Tan, Jinghua; Zeng, Yi; Liu, Yiwu; Ke-jian, Zeng; Liu, Yuejun; Wu, Ruomei; Chen, Hong

doi:10.1016/j.polymertesting.2017.05.007

Cited by 26 publications

(16 citation statements)

References 61 publications

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“…Hence, the angle between normal direction of crystal plane and film surface is 87.4°, indicating that the ordered domains orientation is almost parallel to the film plane (in‐plane orientation). Compared with the 2D‐WAXD results of pristine DABPI film (the calculated angle was 84.6°) , it can be concluded that the in‐plane orientation of ordered domains in DABPI/OMMT (5 wt%) nanocomposite is more obvious than that in DABPI film. The ordered domains with high in‐plane orientation in DABPI/OMMT nanocomposite greatly increase the tortuosity of penetrant molecules pathways in the matrix.…”

Section: Resultsmentioning

confidence: 80%

“…. The DABPI/OMMT (5 wt%) nanocomposite presents outstanding dimensional stability with a CTE of −1.1 ppm K – 1 within the range of 50–300°C, which is 65% lower than that of pristine DABPI film (–3.2 ppm K – 1 ) . Thus, the addition of OMMT nanoplatelets also enhances the thermal and dimensional stability of the DABPI.…”

Section: Resultsmentioning

confidence: 99%

“…Poor thermal stability with the T 5d% low to 321°C is observed for OMMT, because of the organically modification. The T 5d% of DABPI/OMMT (5 wt%) nanocomposite is 568°C, which is 26°C higher than that of pristine DABPI . The TMA of DABPI/OMMT (5 wt%) nanocomposite is also investigated, as presented in Fig.…”

Section: Resultsmentioning

confidence: 99%

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Enhanced gas barrier and thermal properties of polyimide/montmorillonite nanocomposites as a result of “dual‐plane” structure effect

Liu

Ding

et al. 2017

Polymer Composites

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A type of highly exfoliated, dispersed, and oriented organic montmorillonite filled polyimide (DABPI/OMMT) nanocomposites has been prepared successfully via in situ polymerization. Compared with the pristine DABPI, the DABPI/OMMT nanocomposites exhibit much better barrier and thermal performance. The water vapor permeability and oxygen permeability of DABPI/OMMT (5 wt%) are low to 0.31 g mil m−2 day−1 and 0.72 cm3 mil m−2 day−1, respectively. Meanwhile, its 5% weight‐loss temperature and coefficient of thermal expansion are 568°C and −1.1 ppm K−1, respectively. The results of transmission electron microscopy, 1D and 2D wide angle X‐ray diffractograms, as well as positron annihilation lifetime spectroscopy reveal that the excellent barrier and thermal performance of DABPI/OMMT (5 wt%) are mainly because of the high orientation of OMMT, increased crystallinity and low free volume of DABPI matrix. These are resulted from the “dual‐plane” structure effect, which is the synergistic orientation effect between the rigid planar molecular chains of DABPI and nanoplatelets of OMMT. POLYM. COMPOS., 39:E1725–E1732, 2018. © 2017 Society of Plastics Engineers

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Section: Resultsmentioning

confidence: 80%

Section: Resultsmentioning

confidence: 99%

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Enhanced gas barrier and thermal properties of polyimide/montmorillonite nanocomposites as a result of “dual‐plane” structure effect

Liu

Ding

et al. 2017

Polymer Composites

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“… a Measured by DMA; b CTE within the range of 100~300 °C; c The values are obtained from Ref. [ 35 ]; d The values are obtained from Ref. [ 21 ].…”

Section: Figures Schemes and Tablesmentioning

confidence: 99%

High-Barrier Polyimide Containing Carbazole Moiety: Synthesis, Gas Barrier Properties, and Molecular Simulations

et al. 2020

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A high-barrier polyimide (2,7-CPI) was synthesized through the polymerization of pyromellitic dianhydride (PMDA) and a novel diamine (2,7-CDA) containing carbazole moiety. The synthesized diamine and polyimide were fully characterized by elemental analyses, FTIR and NMR. The 2,7-CPI displays very attractive barrier performances, with oxygen transmission rate (OTR) and water vapor transmission rate (WVTR) low to 0.14 cm3·m−2·day−1 and 0.05 g·m−2·day−1, respectively. Meanwhile, 2,7-CPI also exhibits exceptional thermal stability with a glass transition temperature (Tg) of 467 °C, 5% weight-loss temperature (Td5%) of 550 °C under N2 and coefficient of thermal expansion (CTE) of 3.4 ppm/K. The barrier performances of 2,7-CPI are compared with those of a structural analogue (2,7-CPPI) and a typical polyimide (Kapton). Their barrier performances with respect to microstructure were investigated by molecular simulations, wide angle X-ray diffraction (WAXD), and positron annihilation lifetime spectroscopy (PALS). The results show that 2,7-CPI possesses better coplanar structure and more number of intermolecular hydrogen bonds among the three PIs, which result in tight chain packing and thereby high crystallinity, low free volume, and decreased chains mobility. That is, the high crystallinity and low free volume of 2,7-CPI reduce the diffusion and solubility of gases. Meanwhile, the poor chains mobility further decreases the gases diffusion. The reduced diffusion and solubility of gases consequently promote the improvement of barrier properties for 2,7-CPI. The polyimide has a wide application prospect in the field of flexible electronic packaging industries.

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“…The unique chemical structure provides them with a high glass-transition temperature (T g ¼ 300-330 C) and significant potential for various applications. 1,14,15 Polyimides are in general prepared through solution polycondensation of diisocyanate and dianhydride [16][17][18] ; however, the traditional polycondensation of dianhydride and diisocyanate is conducted using conventional thermal methods, using a water or oil bath. Reactions using conventional heating need more time to complete.…”

Section: Introductionmentioning

confidence: 99%

Improved synthesis and properties of BTDA-TDI/MDI ternary copolyimides via microwave-assisted polycondensation

Huang

Lei

2020

High Performance Polymers

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Polyimides are usually synthesized over a long period of time, and the process is complex. In order to shorten the synthesis time and simplify the process, we developed an improved synthesis method, namely, microwave-assisted polycondensation. The 3,3′-4,4′-benzophenone tetracarboxylic dianhydride (BTDA)–2,4-tolylene diisocyanate (TDI)/1,1′-methylenebis(4-isocyanatobenzene) (MDI) ternary copolyimides prepared in this work have been synthesized using microwave heating at rather short reaction times (15 min), without the need for either the once-off addition of TDI/MDI or the drop-wise addition of that mixture. The structure of the desired ternary copolyimide was confirmed by proton nuclear magnetic resonance spectroscopy and Fourier transform infrared spectroscopy. Its glass-transition temperature is above 400°C, and the temperature for 5% thermal loss under nitrogen atmosphere is 508.8°C. The tensile strength is 141 MPa, which shows that the microwave-assisted copolyimide has excellent heat resistance and mechanical properties.

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Synthesis and characterization of high-barrier polyimide containing rigid planar moieties and amide groups

Cited by 26 publications

References 61 publications

Enhanced gas barrier and thermal properties of polyimide/montmorillonite nanocomposites as a result of “dual‐plane” structure effect

Enhanced gas barrier and thermal properties of polyimide/montmorillonite nanocomposites as a result of “dual‐plane” structure effect

High-Barrier Polyimide Containing Carbazole Moiety: Synthesis, Gas Barrier Properties, and Molecular Simulations

Improved synthesis and properties of BTDA-TDI/MDI ternary copolyimides via microwave-assisted polycondensation

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