Nonlinear viscoelasticity of polymer melts in different types of flow

1987 ◽  
Vol 26 (2) ◽  
pp. 135-143 ◽  
Author(s):  
P. J. R. Leblans
Keyword(s):  
Polymer Melts ◽  
Nonlinear Viscoelasticity ◽  
Different Types

scholarly journals Nonlinear Viscoelasticity of Fiber-Filled Liquid Crystaline Polymer Melts

2002 ◽  
Vol 48 (1) ◽  
pp. 17-26
Author(s):  
ARAKI Katsuhiko ◽  
KITANO Takeshi ◽  
MAEKAWA Zen-ichiro
Keyword(s):  
Polymer Melts ◽  
Nonlinear Viscoelasticity

Nonlinear Viscoelasticity of Polymer Melts

1975 ◽  
Vol 19 (4) ◽  
pp. 595-615 ◽  
Author(s):  
T.‐T. Tee ◽  
J. M. Dealy
Keyword(s):  
Polymer Melts ◽  
Nonlinear Viscoelasticity

The mirror relations and nonlinear viscoelasticity of polymer melts

1985 ◽  
Vol 24 (2) ◽  
pp. 152-158 ◽  
Author(s):  
P. J. R. Leblans ◽  
J. Sampers ◽  
H. C. Booij
Keyword(s):  
Polymer Melts ◽  
Nonlinear Viscoelasticity

Development of Temperature Control System of Multi-Function and All-Electric Rheometer

2013 ◽  
Vol 853 ◽  
pp. 531-535
Author(s):  
Xiang Gang Li ◽  
Yue Jun Liu ◽  
Wen Yong Liu ◽  
Hui Tan ◽  
Xiao Yuan Zhou ◽  
...  
Keyword(s):  
Control System ◽  
Temperature Control ◽  
Design Principle ◽  
Polymer Melts ◽  
Nonlinear Viscoelasticity ◽  
Heating System ◽  
Temperature Control System ◽  
Control Error ◽  
Control Stability ◽  
Rheological Test

In order to study the nonlinear viscoelasticity of polymer melts at high shear rate, multi-function and all-electric rheometer (MAR) was designed by the authors. Development of temperature control system of MAR is important because rheological behavior of polymer melts is affected by temperature significantly. The design principle of the temperature control system of MAR was studied. According to the temperature upper limit the barrel need to reach, and the power the heating system can offer to maintain the temperature, the suitable type of heating system was determined. Considering the requirement of heater and the measurement error, the suitable type of temperature transducer was determined. The measured values of temperature were compared with the set values of them to evaluate the temperature control error of MAR. The results show that the temperature fluctuation is smaller than ±0.4°C in 3.5 minute. Therefore, the temperature control error of MAR is small enough for rheological test. And the temperature control stability of MAR is very well.

Size Design of Capillary and Barrel of Multi-Function and All-Electric Rheometer

2013 ◽  
Vol 853 ◽  
pp. 536-540
Author(s):  
Xiang Gang Li ◽  
Yue Jun Liu ◽  
Yi Chen ◽  
Xiao Yuan Zhou ◽  
Hui Tan ◽  
...  
Keyword(s):  
Shear Rate ◽  
Polymer Melts ◽  
Nonlinear Viscoelasticity ◽  
Wall Slip ◽  
High Shear Rate ◽  
High Shear ◽  
Rate Range ◽  
Pressure Correction ◽  
Precise Calculation ◽  
Entrance Pressure

Multi-function and all-electric rheometer (MAR) was designed by the authors to study the nonlinear viscoelasticity of polymer melts at high shear rate. It is important to design suitable size of capillary and barrel because it is the calculation basis for some other important parts and determines the shear rate range of MAR. Considering the shear rate range, the entrance pressure correction and the wall slip correction, the length and diameter of capillary and barrel of MAR were designed through particular analysis and precise calculation.

The extinction time of a general birth and death process with catastrophes

1986 ◽  
Vol 23 (04) ◽  
pp. 851-858 ◽  
Author(s):  
P. J. Brockwell
Keyword(s):  
Laplace Transform ◽  
Size Distribution ◽  
Sufficient Conditions ◽  
Necessary And Sufficient Conditions ◽  
Death Process ◽  
Extinction Time ◽  
Birth And Death Process ◽  
Different Types ◽  
The Laplace Transform ◽  
Necessary And Sufficient

The Laplace transform of the extinction time is determined for a general birth and death process with arbitrary catastrophe rate and catastrophe size distribution. It is assumed only that the birth rates satisfyλ0= 0,λj> 0 for eachj> 0, and. Necessary and sufficient conditions for certain extinction of the population are derived. The results are applied to the linear birth and death process (λj=jλ, µj=jμ) with catastrophes of several different types.

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