Synthesis and Properties of Organosoluble and Transparent Fluorinated Aromatic Polyimides

2011 ◽  
Vol 391-392 ◽  
pp. 888-893
Author(s):  
Yun Hua Lu ◽  
Zhi Zhi Hu ◽  
Yong Fei Wang ◽  
Qing Xu Fang
Keyword(s):  
Molecular Structure ◽  
Thermal Properties ◽  
Organic Solvents ◽  
Aromatic Polyimides ◽  
Fluorinated Polyimides ◽  
Thermal Imidization

In this paper, we mainly investigated the properties of fluorinated polyimides film materials. Two aromatic dianhydrides, PMDA and ODPA were poly-condensed with four fluorinated diamines to prepare fluorinated polyimides by the two-step thermal imidization process. The properties of these polyimides were characterized by IR, TGA and UV-vis instrument. The organosolublility of these polyimides was tested in various organic solvents, such as NMP, DMF, DMAc. In addition, the effect of monomers’ molecular structure on the optical, soluble and thermal properties of these polyimides was also studied.

scholarly journals Highly Soluble Fluorinated Polyimides Synthesized with Hydrothermal Process towards Sustainable Green Technology

Polymers ◽  
2021 ◽  
Vol 13 (21) ◽  
pp. 3824
Author(s):  
Juheon Lee ◽  
Seungho Baek ◽  
Jinsu Kim ◽  
Sangrae Lee ◽  
Jinyoung Kim ◽  
...  
Keyword(s):  
Comparative Analysis ◽  
Organic Solvents ◽  
Hydrothermal Process ◽  
Green Technology ◽  
Synthetic Methods ◽  
Daily Lives ◽  
Fluorinated Polyimides ◽  
Thermal Imidization ◽  
Lower Temperature ◽  
Toxic Organic Solvents

Polyimides, a widely used engineering plastic, require use of large amounts of toxic and hazardous organic solvents which threaten our daily lives, calling for new and easy synthetic methods for sustainable environmentally friendly development. In this paper, highly soluble fluorinated polyimides based on 4,4′-(hexafluoroisopropylidene) diphthalic anhydride were synthesized via hydrothermal process without using any toxic organic solvents and the advantages of the newly demonstrated synthetic methods are shown by comparative analysis performed with the two conventional synthetic methods using organic solvent: thermal and chemical imidization. Lower temperature is required (~200 °C) compared to thermal imidization and functional groups for high fusibility formed more easily compared to chemical imidization. According to the comparative analysis, hydrothermally synthesized PIs showed excellent solubility and maintained high thermal stability (>500 °C) and glass transition temperature (>300 °C) compared to conventional PI. The hydrothermally synthesized polyimide is much more convenient to store and manage than other form of polyimide which is much more stable when it is exposed to humidity as it is a powder form. The hydrothermal synthetic method is verified to be a “Green” and facile method for sustainable PI synthesis.

Transient color changes in oxidative-stable fluorinated polyimide film for flexible display substrates

RSC Advances ◽  
2015 ◽  
Vol 5 (71) ◽  
pp. 57339-57345 ◽  
Author(s):  
Yooseong Yang ◽  
Youngsuk Jung ◽  
Myung Dong Cho ◽  
Seung Geol Lee ◽  
Soonchul Kwon
Keyword(s):  
Optical Properties ◽  
Polyimide Film ◽  
Flexible Display ◽  
Color Changes ◽  
Fluorinated Polyimide ◽  
Fluorinated Polyimides ◽  
Thermal Imidization ◽  
Yellow Index

Stable optical properties of high transmittance and low yellow index, which are required for a polyimide film as a flexible display substrate could be affected by thermal imidization even in oxidative-stable fluorinated polyimides.

Molecular Structure and Smectic Properties: Thermal Properties of Some Liquid Crystals Having a Nitro Group at the Terminal Position

1991 ◽  
Vol 201 (1) ◽  
pp. 95-113 ◽  
Author(s):  
Yoshiaki Sakurai ◽  
Shunsuke Takenaka ◽  
Hisanori Sugiura ◽  
Shigekazu Kusabayashi ◽  
Yasuo Nishihata ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Thermal Properties ◽  
Liquid Crystals ◽  
Nitro Group ◽  
Terminal Position

Thermal Properties, Molecular Structure, and Thin-Film Organic Semiconductor Crystallization

2020 ◽  
Vol 124 (49) ◽  
pp. 27213-27221
Author(s):  
Jordan T. Dull ◽  
Yucheng Wang ◽  
Holly Johnson ◽  
Komron Shayegan ◽  
Ellie Shapiro ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Thin Film ◽  
Thermal Properties ◽  
Organic Semiconductor

Solubilities of formononetin and daidzein in organic solvents: Effect of molecular structure and interaction on solvation process

2017 ◽  
Vol 231 ◽  
pp. 542-554 ◽  
Author(s):  
Xinyan Dong ◽  
Yifeng Cao ◽  
Humin Lin ◽  
Yi Yao ◽  
Yi Guo ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Organic Solvents

Synthesis and Characterization of Aromatic Polyimides Bearing Nonlinear Optical Chromophores

2000 ◽  
Vol 12 (1) ◽  
pp. 169-176 ◽  
Author(s):  
L Bes ◽  
A Rousseau ◽  
B Boutevin ◽  
R Mercier ◽  
B Sillion ◽  
...  
Keyword(s):  
Nonlinear Optical ◽  
Second Harmonic ◽  
Uv Spectroscopy ◽  
Harmonic Coefficient ◽  
Aromatic Polyimides ◽  
Relaxation Temperature ◽  
Thermal Imidization ◽  
Nonlinear Optical Chromophores ◽  
Hydroxy Groups ◽  
Optical Chromophores

The syntheses and characterizations of two aromatic polyimides with nonlinear optical (NLO) chromophore side chains were investigated through a two-step synthetic route. These two polymers were prepared by polycondensation of 4,4′-(hexafluoroisopropylidene) diphthalic anhydride (6FDA) with 4-(4-amino, 2-hydroxy) phenoxyaniline (HODA) and 2,2-bis(3-amino-4-hydroxyphenyl)hexafluoropropane (6FAP), respectively. First the poly(hydroxy)imides were prepared by direct thermal imidization. The resulting polyimides bearing hydroxy groups were found to react easily with the terminal hydroxy group of the chromophore (Disperse Red1 (DR1)) via the Mitsunobu reaction. The high content of chromophore for the polyimide with 6FAP diamine was confirmed by UV spectroscopy and ellipsometry spectroscopy measures. The resulting NLO polyimides possess high glass transition temperatures ( Tg > 185°C), excellent solubilities and processabilities even though the extent of chromophore grafting is up to 95 mol%. The second harmonic coefficient ( d33) at the wavelength of 1320 nm is close to 30 pm V−1. The thermal and temporal stabilities of the NLO properties were investigated. The relaxation temperature of the SHG signal measured at the 50% decay of the initial SHG signal ( I 2ω/2 at 2°C min−1) was 168°C for the polyimide based on HODA and 157°C for the polyimide based on 6FAP.

Effect of Catalyst on the Molecular Structure and Thermal Properties of Isosorbide Polycarbonates

2018 ◽  
Vol 57 (14) ◽  
pp. 4824-4831 ◽  
Author(s):  
Ming Zhang ◽  
Wenqin Lai ◽  
Lili Su ◽  
Guozhang Wu
Keyword(s):  
Molecular Structure ◽  
Thermal Properties
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