Longest relaxation times of linear polymers in concentration regions between the critical concentrations for zero-shear viscosity and for steady-state compliance

1990 ◽  
Vol 23 (1) ◽  
pp. 242-245 ◽  
Author(s):  
Yoshiaki Takahashi ◽  
Michio Wakutsu ◽  
Ichiro Noda
Keyword(s):  
Steady State ◽  
Shear Viscosity ◽  
Relaxation Times ◽  
Linear Polymers ◽  
Zero Shear Viscosity ◽  
Critical Concentrations ◽  
State Compliance

Dependence of zero-shear viscosity and steady-state compliance on molecular weight between entanglements for ethylene–cycloolefin copolymers

Polymer ◽  
2006 ◽  
Vol 47 (13) ◽  
pp. 4811-4815 ◽  
Author(s):  
Toshikazu Takigawa ◽  
Hidenori Kadoya ◽  
Takashi Miki ◽  
Takashi Yamamoto ◽  
Toshiro Masuda
Keyword(s):  
Molecular Weight ◽  
Steady State ◽  
Shear Viscosity ◽  
Zero Shear Viscosity ◽  
State Compliance

Relaxation times of polymer solutions in the semidilute region for zero-shear viscosity

1988 ◽  
Vol 21 (7) ◽  
pp. 2257-2262 ◽  
Author(s):  
Yoshiaki Takahashi ◽  
Masanari Umeda ◽  
Ichiro Noda
Keyword(s):  
Shear Viscosity ◽  
Polymer Solutions ◽  
Relaxation Times ◽  
Zero Shear Viscosity

Effects of Molecular Weight Distribution on Zero-Shear Viscosity of Linear Polymers in Dilute and Semidilute Regions.

1992 ◽  
Vol 24 (9) ◽  
pp. 987-990 ◽  
Author(s):  
Yoshiaki Takahashi ◽  
Daisuke Sakakura ◽  
Michio Wakutsu ◽  
Masayoshi Yamaguchi ◽  
Ichiro Noda
Keyword(s):  
Molecular Weight ◽  
Molecular Weight Distribution ◽  
Shear Viscosity ◽  
Weight Distribution ◽  
Linear Polymers ◽  
Zero Shear Viscosity

Determining Zero Shear Viscosity of Polycarbosilane Melts

2017 ◽  
Vol 726 ◽  
pp. 95-99 ◽  
Author(s):  
Zi Qing Zhu ◽  
Liu Ying Huang ◽  
Xuan Cheng ◽  
Ying Zhang
Keyword(s):  
Silicon Carbide ◽  
Steady State ◽  
Shear Viscosity ◽  
Averaging Method ◽  
Polymer Precursor ◽  
Ceramic Fibers ◽  
Zero Shear Viscosity ◽  
Silicon Carbide Ceramic ◽  
Prolonged Time ◽  
Time Required

As an important precursor in preparation of silicon carbide ceramic fibers by polymer precursor-derived method, it is very difficult to find the zero shear viscosity through the conventional steady test for the oligomer-like polycarbosilane (PCS) because of the possible oxidation and a prolonged time required to attain a steady state of the samples. In this work, a steady test and a series of transient tests were performed for the PCS melts. The limitation of the steady test is discussed. An averaging method based upon data from the transient tests is developed to determine the zero shear viscosity for the melt. The reliability of the results from the method is discussed and the zero shear viscosity of the pretreated PCS melt was obtained.

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