Bulk intrinsic viscosity, determination

The use of a continuous GPC viscosity detector in conjunction with a DRI detector permits the quantitative determination of absolute molecular weight distribution in polymers. Furthermore, from this combination one can obtain Mark-Houwink parameters and the bulk intrinsic viscosity of a given polymer with a GPC calibration curve based only on polystyrene standards. Coupling these two detectors with ultraviolet and infrared detectors then will permit the concurrent determination of polymer composition as a function of molecular weight and... 

Evaluating the Polymer. The intrinsic viscosity (IV) of the polymer was determined at 25° C. with solutions in benzene or toluene containing 0.1 gram/liter polymer and calculated with the equation IV = (In rjTei)/C. In many cases some gel formation made I V determination for the whole polymer impracticable. Hoekstra viscosities of a number of polymers were measured at 100° C. with the Hoekstra (Wallace) plastometer (42). This instrument provides bulk viscosity data for rubbers on a scale 0 (low viscosity) to 100 (high viscosity). 

In its turn, the value a is linked with intrinsic viscosities of polymer in arbitrary [r ] and 0-solvent [rjjg according to the Eq. (6). The bulk interactions (which result in deviation of coil shape from ideal Gaussian one) parameter e is determined as follows [22] ... 

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