Structure and properties of polyimide films during a far-infrared-induced imidization process

2004 ◽  
Vol 42 (13) ◽  
pp. 2490-2501 ◽  
Author(s):  
Yi-Kun Xu ◽  
Mao-Sheng Zhan ◽  
Kai Wang
Keyword(s):  
Far Infrared ◽  
Structure And Properties ◽  
Polyimide Films

Effect of pre-imidization on the aggregation structure and properties of polyimide films

Polymer ◽  
2012 ◽  
Vol 53 (19) ◽  
pp. 4157-4163 ◽  
Author(s):  
Ying Wang ◽  
Yang Yang ◽  
Zhenxing Jia ◽  
Jiaqiang Qin ◽  
Yi Gu
Keyword(s):  
Structure And Properties ◽  
Polyimide Films ◽  
Aggregation Structure

Far-infrared radiation effect on the structure and properties of proteins

1991 ◽  
Vol 12 (12) ◽  
pp. 1469-1474 ◽  
Author(s):  
V. M. Govorun ◽  
V. E. Tretiakov ◽  
N. N. Tulyakov ◽  
V. B. Fleurov ◽  
A. I. Demin ◽  
...  
Keyword(s):  
Infrared Radiation ◽  
Radiation Effect ◽  
Far Infrared ◽  
Structure And Properties ◽  
Far Infrared Radiation

Preparation, structure and properties of porous polyimide films via PAA/PU alloy

2007 ◽  
Vol 2 (1) ◽  
pp. 13-16
Author(s):  
Jiugui Liu ◽  
Lizhong Jiang ◽  
Jiayu Zhan ◽  
Dezhen Wu ◽  
Riguang Jin
Keyword(s):  
Structure And Properties ◽  
Polyimide Films

Organo-soluble segmented rigid-rod polyimide films. Part 4.—Anisotropic structure and properties

1993 ◽  
Vol 3 (4) ◽  
pp. 353-360 ◽  
Author(s):  
Fred E. Arnold ◽  
Dexing Shen ◽  
Chul Joo Lee ◽  
Frank W. Harris ◽  
Stephen Z. D. Cheng ◽  
...  
Keyword(s):  
Anisotropic Structure ◽  
Structure And Properties ◽  
Polyimide Films ◽  
Rigid Rod

Structure and Properties Research of Multi-Antibacterial Polyamide Fibers

2011 ◽  
Vol 331 ◽  
pp. 179-183
Author(s):  
Wei Wei Sun ◽  
Hua Zhang ◽  
Yong Kai Zhou
Keyword(s):  
Antibacterial Effect ◽  
Far Infrared ◽  
Infrared Emission ◽  
Structure And Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Oxygen Ions ◽  
Polyamide Fibers ◽  
Scanning Electron ◽  
Structure Properties

To explore the effect of multi-antibacterial powders on the polyamide fibers, we analyzed the structure and properties of the polyamide fibers in this paper, which have features of antibacterial, far-infrared emission and negative oxygen ions emission. The effects of adding multi-antibacterial power were tested by Scanning Electron Microscopy and spectrum tests, X-ray diffraction, thermal analysis and infrared spectroscopy. Our data indicated that multi-antibacterial polyamide fibers have excellent antibacterial effect, good far-infrared emission and the negative oxygen ions emission features, while have little affect on polyamide fibers’ structure properties.

Alteration of Structure and Properties of Thin Polyimide Films and Coatings by Plasma and Thermal Treatment

2004 ◽  
Vol 38 (2) ◽  
pp. 124-128 ◽  
Author(s):  
O. A. Agapov ◽  
P. G. Babaevskii ◽  
A. A. Zhukov ◽  
G. A. Korneeva ◽  
I. Yu. Korovina ◽  
...  
Keyword(s):  
Thermal Treatment ◽  
Structure And Properties ◽  
Polyimide Films

Structure Development in Polyimide Films

1993 ◽  
Vol 308 ◽  
Author(s):  
John C. Coburn ◽  
Michael T. Pottiger ◽  
Coralie A. Pryde
Keyword(s):  
Glass Transition ◽  
Coefficient Of Thermal Expansion ◽  
Rapid Heating ◽  
Biaxial Stress ◽  
Slow Heating ◽  
Structure And Properties ◽  
Polyimide Films ◽  
Axis Orientation ◽  
Chain Axis ◽  
Out Of Plane

ABSTRACTThe influence of processing conditions on the structure and properties in spin coated polyimide films prepared from flexible, semi-rigid and rigid chemistries was investigated. While the relationship between processing, structure and properties is different for each chemistry, some general trends were observed. Curing above the glass transition in the flexible polyimide BTDA//ODA/MPD, that is incapable of crystallizing and has very little in-plane orientation, has virtually no effect on the structure or properties compared to curing below the glass transition. Curing at temperatures above the glass transition in cry stall izable stiff polyimides such as BPDA//PPD and PMDA//ODA results in an increase in birefringence, in-plane CTE and biaxial stress. In BPDA//PPD, the increase in birefringence is attributed to an increase in polarizability and possibly, an increase in the overall in-plane alignment of the imide ring as evidenced by IR analysis. The increase in in-plane CTE is attributed to a loss in chain axis orientation caused by relaxation effects. The increase in stress is attributed to the increase in the in-plane CTE and also from shrinkage forces arising from crystallization. Rapid heating during cure in the flexible amorphous BTDA//ODA/MPD has essentially no effect on structure or properties compared to slow heating. In the semi-crystalline polyimides, rapid heating during cure leads to higher levels of crystallinity and significantly higher stresses. The increase in stresses is attributed to a loss in chain axis orientation in the plane of the film and shrinkage forces arising from additional crystallization. The directional dependence of the coefficient of thermal expansion, an important functional property, is extremely sensitive to molecular anisotropy. BTDA//ODA/MPD, which is almost isotropic, has an out-of-plane CTE that is approximately 20 percent higher than the in-plane CTE. In contrast, the out-of-plane CTE for the most anisotropic polyimide in this study, BPDA//PPD, is 25 times larger than the in-plane CTE. This sensitivity of the CTE to molecular orientation must be taken into account when modeling stress in, or designing, electronic devices.

Synthesis and Properties of Polyimides Containing Tert-Buty Group

2013 ◽  
Vol 275-277 ◽  
pp. 1636-1639
Author(s):  
Yun Hua Lu ◽  
Peng Pan ◽  
Bing Wang ◽  
Hong Bin Zhao ◽  
Zhi Zhi Hu
Keyword(s):  
Optical Properties ◽  
Fourier Transform ◽  
Amic Acid ◽  
Structure And Properties ◽  
Visible Spectroscopy ◽  
Polyimide Films ◽  
Solubility Test ◽  
Tert Butyl ◽  
Thermal Imidization ◽  
Ft Ir

Two diamine monomers 2-tert-butyl-1,4-bis(4-nitro-2-trifluoromethylphenoxy)benzene and 1,4-bis(4-amino-2-trifluoromethylphenoxy)benzene were reacted with the alicyclic dianhydride monomers 1,2,3,4-cyclobutanetetracarboxylic dianhydride to synthesize the poly(amic acid)s, and then obtain the corresponding polyimide films through thermal imidization. The structure and properties were characterized by fourier transform infrared spectroscopy (FT-IR), ultraviolet visible spectroscopy (UV-vis), thermogravimetic analysis (TGA), solubility test and so on. The effect of introduction of bulky tert-butyl and trifluoromethyl to the polyimide backbone on the properties of polyimide films was investigated. The experimental results showed that polyimides with tert-buty group exhibit excellent solubility, but their thermal and optical properties decreased slightly.

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