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

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

scholarly journals EFFECT OF POLYETHYLENE MOLECULAR MASS CHARACTERISTICS ON SLIP EFFECT

2016 ◽  
Vol 11 (5) ◽  
pp. 91-93
Author(s):  
A. A. Yurkin ◽  
I. D. Simonov-Emelyanov ◽  
P. V. Surikov ◽  
N. L. Shembel
Keyword(s):  
Molecular Weight ◽  
Molecular Mass ◽  
Rheological Properties ◽  
Melt Flow Index ◽  
Flow Index ◽  
Slip Effect ◽  
Melt Flow ◽  
Molecular Weight Characteristics ◽  
Different Temperatures ◽  
Different Molecular Weight

The rheological properties of polyethylene with different molecular weight characteristics were studied. Difference of molecular weight characteristics was found on the basis of melt flow index, and slip effect in the molten polyethylene flow was studied. The presence of slip effect is found in case of flowing polyethylene with a higher molecular weight in contrast to polyethylene with lower molecular weight at different temperatures. Changes of the slip effect parameters upon mixing polyethylenes with very much different molecular weight characteristics were studied.

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

scholarly journals Insights into the mechanical properties of a silicone oil gel with a ‘latent’ gelator, 1-octadecylamine, and CO2 as an ‘activator’

2010 ◽  
Vol 6 ◽  
pp. 984-991 ◽  
Author(s):  
Emiliano Carretti ◽  
Mathew George ◽  
Richard G Weiss
Keyword(s):  
Mechanical Properties ◽  
Carbon Dioxide ◽  
Molecular Mass ◽  
Rheological Properties ◽  
Silicone Oil ◽  
Mechanical Measurements

A detailed study of the rheological properties of silicone oil gels, made from a low-molecular-mass organic gelator, a combination of 1-octadecylamine (a latent gelator) and carbon dioxide (an ‘activating’ molecule), is reported. Information gleaned from the mechanical measurements is used to characterize the gel networks and how they respond to temperature and strain. It is shown, for example, that very precise measurements of the gel-to-sol transitions can be obtained from plots of viscosity versus temperature.

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