The Effect of Non‐Homogeneity of Molecular Weight on the Scattering of Light by High Polymer Solutions

1944 ◽  
Vol 12 (5) ◽  
pp. 203-204 ◽  
Author(s):  
B. H. Zimm ◽  
P. M. Doty
Keyword(s):  
Molecular Weight ◽  
Polymer Solutions ◽  
High Polymer ◽  
Scattering Of Light

HEATS OF MIXING OF POLYISOBUTYLENE WITH SOME ORGANIC SOLVENTS

1960 ◽  
Vol 38 (7) ◽  
pp. 1087-1091 ◽  
Author(s):  
Claude Watters ◽  
Hubert Daoust ◽  
Marcel Rinfret
Keyword(s):  
Molecular Weight ◽  
Organic Solvents ◽  
Polymer Solutions ◽  
High Polymer ◽  
Molecular Weight Range ◽  
Polymer Sample ◽  
Weight Range ◽  
Calvet Microcalorimeter ◽  
Heats Of Mixing ◽  
Scatchard Equation

The heats of mixing of four fractions of polyisobutylene with five organic solvents have been measured at 25 °C with the use of a Tian–Calvet microcalorimeter. The maximum concentrations attained were of the order of 3% in polymer. It has been found that the enthalpy parameter k0 is independent of the molecular weight of the polymer sample in the investigated molecular weight range. All the values for k0 calculated from the Van Laar–Scatchard equation for the different polymer–solvent pairs are different from the values estimated from the partial molal quantities. This is explained with the use of new theories on the thermodynamics of high polymer solutions by Orofino and Flory and by Huggins.

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