2D infrared correlation study of the effect of base catalyst on thermal imidization of polyamic acid

2020 ◽  
Vol 1217 ◽  
pp. 128383 ◽  
Author(s):  
Yu Jeong Lee ◽  
Boknam Chae ◽  
Yeonju Park ◽  
Young Mee Jung ◽  
Seung Woo Lee
Keyword(s):  
Correlation Study ◽  
Base Catalyst ◽  
Polyamic Acid ◽  
Thermal Imidization

Kinetic study of free volume changes occurring in films during thermal imidization of polyamic acid

1984 ◽  
Vol 26 (9) ◽  
pp. 2174-2180 ◽  
Author(s):  
N.F. Chugunova ◽  
V.M. Startsev ◽  
G.M. Bartenev ◽  
I.I. Bardyshev ◽  
A.G. Skvortsov
Keyword(s):  
Kinetic Study ◽  
Free Volume ◽  
Volume Changes ◽  
Polyamic Acid ◽  
Thermal Imidization

scholarly journals Thermal imidization of polyamic acid–fullerene composites: 'in situ' X-ray diffraction study

2007 ◽  
Vol 14 (3) ◽  
pp. 199-213
Author(s):  
M. E. Cagiao ◽  
A. O. Pozdnyakov ◽  
M. Krumova ◽  
V. V. Kudryavtsev ◽  
F. J. Baltá Calleja
Keyword(s):  
Diffraction Study ◽  
X Ray Diffraction ◽  
Polyamic Acid ◽  
X Ray ◽  
Thermal Imidization

In-plane Molecular Order of a Photo-oriented Polyamic Acid Film: Enhancement upon Thermal Imidization

2004 ◽  
Vol 412 (1) ◽  
pp. 293-299 ◽  
Author(s):  
Kenji Sakamoto ◽  
Manabu Kikegawa ◽  
Sukekatsu Ushioda ◽  
Kenji Sakamoto ◽  
Kiyoaki Usami ◽  
...  
Keyword(s):  
Molecular Order ◽  
Polyamic Acid ◽  
Thermal Imidization

Kinetics and mechanisms of thermal imidization of a polyamic acid studied by ultraviolet-visible spectroscopy

1989 ◽  
Vol 22 (3) ◽  
pp. 1174-1183 ◽  
Author(s):  
Eumi Pyun ◽  
Richard J. Mathisen ◽  
Chong Sook Paik Sung
Keyword(s):  
Visible Spectroscopy ◽  
Polyamic Acid ◽  
Thermal Imidization

Changes in the rheological properties and molecular mass of a polyamic acid during its thermal imidization

1987 ◽  
Vol 29 (3) ◽  
pp. 509-515
Author(s):  
V.M. Startsev ◽  
N.F. Chugunova ◽  
N.I. Morozova ◽  
V.V. Nesterov ◽  
V.D. Krasikov ◽  
...  
Keyword(s):  
Molecular Mass ◽  
Rheological Properties ◽  
Polyamic Acid ◽  
Thermal Imidization

Spontaneous molecular orientation of polyimides induced by thermal imidization. I. Uniaxial stretching of polyamic acid film

1994 ◽  
Vol 32 (7) ◽  
pp. 1299-1303 ◽  
Author(s):  
Masatoshi Hasegawa ◽  
Yoichi Shindo ◽  
Tokuko Sugimura ◽  
Rikio Yokota ◽  
Masakatsu Kochi ◽  
...  
Keyword(s):  
Molecular Orientation ◽  
Polyamic Acid ◽  
Uniaxial Stretching ◽  
Thermal Imidization

Electrospun polyimide nanofibrous membranes for absorption of oil spills

2019 ◽  
Vol 50 (4) ◽  
pp. 584-595 ◽  
Author(s):  
Yongsheng Liu ◽  
Xiaoming Qian ◽  
Liang Wang ◽  
He Bai ◽  
Yuanwen Cui
Keyword(s):  
Oil Spills ◽  
Contact Angles ◽  
Nanofibrous Membrane ◽  
Harsh Environments ◽  
Water Contact ◽  
Polyamic Acid ◽  
Thermal Imidization ◽  
Oil Adsorption ◽  
Nanofibrous Membranes ◽  
Acid Precursor

The demand for an efficient method for absorbing oil in harsh environments is increasingly urgent around the world. In this study, polyimide nanofibrous membranes were fabricated via electrospinning of polyamic acid precursor solutions followed by a thermal imidization. Polytetrafluoroethylene (PTFE) microparticles were added to modify the performance of polyimide nanofibrous membrane. Their morphologies were observed by field emission scanning electron microscopy, which revealed that polyimide nanofiber diameters ranged from 200 ± 20 to 350 ± 35 nm by adjusting polyamic acid concentrations. Polytetrafluoroethylene microparticles were embedded in polyimide matrices, which enhanced the mechanical strength and hydrophobicity of the polyimide nanofibrous membrane. Adding 1.8% polytetrafluoroethylene microparticles, the tensile strength of sample P6 was increased by 6.44-fold and water contact angles rose from 105 to 133°. Sample P2 had a maximum oil adsorption capacity of 2650% and a water contact angle of 107°, which might be considered a competitive future candidate for oil absorption at high temperatures.

Gas Separation Properties of Polyimide Membranes Based on 2,2-Bis(3-amino-4-hydroxyphenyl)hexafluoropropane

2012 ◽  
Vol 524-527 ◽  
pp. 1241-1244 ◽  
Author(s):  
Yan Hong Zheng ◽  
Yu Zhai ◽  
Jian Mei Guo ◽  
Hong Yan Yu ◽  
Lian Cai Wang ◽  
...  
Keyword(s):  
Gas Separation ◽  
Gas Permeability ◽  
Separation Property ◽  
Polycondensation Reaction ◽  
Polyamic Acid ◽  
Ideal Selectivity ◽  
Thermal Imidization ◽  
Polyimide Membranes

A series of polyimides (PIs) by thermal imidization of polyamic acid (PAA) were prepared in order to investigate the gas separation property. The single gas permeability of He, H2, CO2, O2, N2 and CH4 were measured and compared in order to determine the effect of the reaction content and thermal imidization temperature on the gas separation properties. The results showed that the higher the thermal imidization temperature is, the more beneficial for the gas separation properties of the PI membranes. The optimum polycondensation reaction content on preparing PI was 25 wt%. The highest ideal selectivity of He/CH4, H2/CH4, CO2/CH4 and H2/N2 is 2814.88, 1652.38, 216.63 and 191.58, respectively.

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