Practical Evaluation of the [η]-M Relationship II. Estimation of Kθ Values of Polymer Solutions

1969 ◽  
Vol 42 (2) ◽  
pp. 462-470 ◽  
Author(s):  
D. W. van Krevelen ◽  
P. J. Hoftyzer
Keyword(s):  
Intrinsic Viscosity ◽  
Main Chain ◽  
Polymer Solutions ◽  
Chain Stiffness ◽  
Practical Evaluation ◽  
Chain Atom ◽  
Main Chain Atom

Abstract A method is proposed for the prediction of the intrinsic viscosity of θ-solutions, based on the constitution of the dissolved polymer. The method makes use of additive values for constitutional groups to calculate a quantity that represents the specific chain stiffness per main chain atom.

Unusually high values of the quotient d ln η/d ln M of some low-molecular-weight liquid polymers

1985 ◽  
Vol 50 (11) ◽  
pp. 2570-2578
Author(s):  
Miloslav Bohdanecký ◽  
Alois Kaštánek ◽  
František Lešek
Keyword(s):  
Molecular Weight ◽  
Main Chain ◽  
Low Molecular Weight ◽  
Atomic Group ◽  
Polymeric Liquids ◽  
Random Coils ◽  
Chain Atom ◽  
Flow Processes ◽  
Liquid Polymers ◽  
Main Chain Atom

Unusually high values of the quotient d ln η/d ln M ≡ a (where η is viscosity and M is molecular weight) found for some low-molecular-weight liquid polymers (4 ⪬ a ⪬ 8) are discussed in terms of the theory of flow processes of polymeric liquids. The effect is assigned mainly to the dependence on the chain length of the friction factor per main chain atom or atomic group but deviations of short chains from the conformation of random coils can also contribute significantly. The variation of the quotient a with temperature, however, is due to the former factor only.

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