Molecular weight dependence of shear-induced structures in nematic semiflexible polymer solutions

2002 ◽  
Vol 46 (2) ◽  
pp. 367-381 ◽  
Author(s):  
Sanaul K. Siddiquee ◽  
Jan W. van Egmond
Keyword(s):  
Molecular Weight ◽  
Polymer Solutions ◽  
Semiflexible Polymer ◽  
Molecular Weight Dependence

Molecular Weight Dependence of Network Length Scales in Polymer Solutions

2006 ◽  
Vol 39 (5) ◽  
pp. 2000-2003 ◽  
Author(s):  
Takashi Uematsu ◽  
Christer Svanberg ◽  
Per Jacobsson
Keyword(s):  
Molecular Weight ◽  
Polymer Solutions ◽  
Length Scales ◽  
Molecular Weight Dependence

Ultrasonically induced birefringence in polymer solutions

2004 ◽  
Vol 76 (1) ◽  
pp. 97-104 ◽  
Author(s):  
H. Nomura ◽  
Tatsuro Matsuoka ◽  
Shinobu Koda
Keyword(s):  
Molecular Structure ◽  
Molecular Weight ◽  
Frequency Dependence ◽  
Polymer Chain ◽  
Polymer Solutions ◽  
Experimental Results ◽  
Segmental Motion ◽  
Present Treatment ◽  
Molecular Weight Dependence ◽  
Ultrasonic Intensity

For ultrasonically induced birefringence in polymer solutions, both the linear sinusoidal birefringence and the nonlinear stationary birefringence were observed. The sign and value of the stationary ultrasonically induced birefringence depended on the molecular structure of segment and its anisotropy in polarizability. Furthermore, no molecular weight dependence could be observed above the molecular weight 104. The theory based on the viscoelastic ones using the Rouse-Zimm model could not explain our experimental results as a whole. These results strongly suggest that the stationary ultrasonically induced birefringence should be caused by the local segmental motion of polymer chain in solution. For all polymer solutions investigated here, the stationary birefringence per ultrasonic intensity decreased with increasing frequency. This frequency dependence is not consistent with the present treatment for the ultrasonically induced birefringence.

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