scholarly journals Development of In-Plane Orientation in Pyromellitic Dianhydride-Oxydianiline Polyimide Film on Substrate during Thermal Imidization

1999 ◽  
Vol 31 (2) ◽  
pp. 154-159 ◽  
Author(s):  
Hee Tak Kim ◽  
Sang-Kyung Kim ◽  
Jung-Ki Park
Keyword(s):  
Polyimide Film ◽  
Pyromellitic Dianhydride ◽  
Plane Orientation ◽  
Thermal Imidization

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.

scholarly journals In-plane orientation of polyimide chains induced by thermal imidization.

1994 ◽  
Vol 7 (2) ◽  
pp. 275-280 ◽  
Author(s):  
MASATOSHI HASEGAWA ◽  
TAKAFUMI MATANO ◽  
YOICHI SHINDO ◽  
TOKUKO SUGIMURA
Keyword(s):  
Plane Orientation ◽  
Thermal Imidization

Thermal imidization process of polyimide film: Interplay between solvent evaporation and imidization

Polymer ◽  
2017 ◽  
Vol 109 ◽  
pp. 205-215 ◽  
Author(s):  
Wenjuan Chen ◽  
Wei Chen ◽  
Baoqing Zhang ◽  
Shiyong Yang ◽  
Chen-Yang Liu
Keyword(s):  
Polyimide Film ◽  
Solvent Evaporation ◽  
Thermal Imidization

Characterization and Thermal Degradation of Polyimide Derived from 5-amino-2(p-aminophenyl) Benzoxazole Monomer with Pyromellitic Dianhydride

2012 ◽  
Vol 455-456 ◽  
pp. 806-814 ◽  
Author(s):  
Xiang Li Meng ◽  
Ling Jiang ◽  
Yu Dong Huang
Keyword(s):  
Thermal Degradation ◽  
Three Dimensional ◽  
Integral Form ◽  
Polyimide Film ◽  
Amic Acid ◽  
Pyromellitic Dianhydride ◽  
Ozawa Method ◽  
Element Analysis ◽  
Exponential Factor ◽  
Good Thermal Stability

- 5-amino-2(p-aminophenyl) benzoxazole (AAPB) and its derived polyimide prepared with pyromellitic dianhydride (PMDA) were synthesized successfully. Their structures were characterized by FT-IR, 1H NMR, Element analysis, 13C NMR, Solid-state 13CNMR, DSC, TG and XRD. The polyimide was synthesized via a conventional two-stage method. The intermediate poly (amic acid) had inherent viscosity of 1.06dL/g and could be thermally converted into light yellow polyimide film. The polyimide showed excellent solvent resistance and good thermal stability. The glass transition temperature (Tg) was found to be 314°C, the decomposition started at a temperature above 500°C in air and above 550°C in argon atmosphere. The thermal degradation of the polyimide was studied by thermogravimetric analysis (TGA) in order to determine the actual reaction mechanisms of the decomposition process. The apparent activation energy (Ea) was obtained following Flynn-Wall-Ozawa method. The activation energies of different mechanism models and pre-exponential factor (A) were determined by Coats-Redfern method. Compared with the value obtained from the Ozawa method, the actual reaction mechanism obeyed three-dimensional diffusion model, Jander equation (D3) with integral form g(α)=[1-(1-α)1/3]2.

Chain Conformations Of Aromatic Polvimides And Their Ordering In Thin Films.

1991 ◽  
Vol 227 ◽  
Author(s):  
D. Y. Yoon ◽  
W. Parrish ◽  
L. E. Depero ◽  
M. Ree
Keyword(s):  
Thin Films ◽  
Molecular Modeling ◽  
Film Plane ◽  
Pyromellitic Dianhydride ◽  
X Ray Diffraction ◽  
Ordered Structures ◽  
X Ray ◽  
Aromatic Polyimides ◽  
Thermal Imidization ◽  
Chain Conformations

ABSTRACTWe have investigated the conformation – order relationships of four aromatic polyimides prepared by thermal imidization of the precursor poly(amic acids) in thin films. They are: (i) PMDA-4,4′-ODA polyimide from pyromellitic dianhydride (PMDA) and 4,4′-oxydianiline (ODA) monomers; (ii) PMDA-PDA polyimide from PMDA andp-phenylene diamine (PDA); (iii) PMDA-Benzidine polyimide from PMDA and benzidine and (iv) BPDA-PDA polyirnide from biphenylene tetracarboxylicdianhydride (BPDA) and PDA. X-ray diffraction results and their analyses by molecular modeling show that all the four polyimides exhibit extended chain conformations in various smectic-type ordered structures that form monomer repeat layers but differ in the details of interchain packing. Furthermore, the polyimide chains are highly aligned along the film plane.

scholarly journals Enhancement of the Mechanical Properties of Polyimide Film by Microwave Irradiation

Polymers ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 477 ◽  
Author(s):  
Ju-Young Choi ◽  
Seung-Won Jin ◽  
Dong-Min Kim ◽  
In-Ho Song ◽  
Kyeong-Nam Nam ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Irradiation Time ◽  
Polyimide Film ◽  
Amic Acid ◽  
Polyimide Films ◽  
Inorganic Substance ◽  
Short Irradiation Time ◽  
Green Approach ◽  
Thermal Imidization ◽  
Mw Irradiation

Polyimide films have conventionally been prepared by thermal imidization of poly(amic acid)s (PAAs). Here we report that the improvement of tensile strength while increasing (or maintaining) film flexibility of polyimide films was accomplished by simple microwave (MW) irradiation of the PAAs. This improvement in mechanical properties can be attributed to the increase in molecular weight of the polyimides by MW irradiation. Our results show that the mechanical properties of polyimide films can be improved by MW irradiation, which is a green approach that requires relatively low MW power, very short irradiation time, and no incorporation of any additional inorganic substance.

Spontaneous Molecular Orientation of Polyimides Induced by Thermal Imidization. 2. In-Plane Orientation

1996 ◽  
Vol 29 (24) ◽  
pp. 7897-7909 ◽  
Author(s):  
Masatoshi Hasegawa ◽  
Takafumi Matano ◽  
Yoichi Shindo ◽  
Tokuko Sugimura
Keyword(s):  
Molecular Orientation ◽  
Plane Orientation ◽  
Thermal Imidization

scholarly journals Preparation and characterization of hyperbranched polyimides based on 4,4’,4’’-triaminotriphenyl-methane

e-Polymers ◽  
2009 ◽  
Vol 9 (1) ◽  
Author(s):  
Petr Sysel ◽  
Evgenia Minko ◽  
Radana Čechová
Keyword(s):  
Carbon Dioxide ◽  
Weight Loss ◽  
Pyromellitic Dianhydride ◽  
Molar Ratio ◽  
Glass Transition Temperatures ◽  
Thermal Imidization ◽  
No Weight Loss ◽  
Hyperbranched Polyimides ◽  
Oxydiphthalic Anhydride

AbstractThis work focuses on the preparation and characterization of novel hyperbranched polyimides based on commercially available 4,4,’4’’- triaminotriphenylmethane and pyromellitic dianhydride or 4,4’-oxydiphthalic anhydride. The bi- and trifunctional monomers were reacted in a molar ratio of 1:1 or 2:1 to prepare polyimide precursors (hyperbranched polyamic acids) endcapped with either amino or anhydride groups. The precursors were then transformed into hyperbranched polyimides using thermal imidization. The final products were self-standing films, whose thermal behaviour was characterized by having no weight loss up to 250 ºC and by having glass transition temperatures above 200 ºC. We monitored the permeability of carbon dioxide, organic vapours and water vapour through these membranes. We also compared the properties of these materials with linear polyimides based on 4,4’-methylenedianiline combined with either pyromellitic dianhydride or 4,4’-oxydiphthalic anhydride.

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