| Description |
vii, 53 leaves : illustrations ; 29 cm |
| Summary |
"An apparatus has been constructed to investigate the capillary shear degradation of polymer solutions. Maximum shear rates obtainable under flow conditions which could be characterized as nonturbulent were on the order of 10⁵ sec⁻¹. The effect of calculated shear rate, initial molecular weight, and number of passes through the capillary tube on the degradation of polystyrene (with M̄[subscript v] from 22,000 to 1,770,000) solutions in toluene (0.1 wt.%) were studied. The tests in the 0.0105 in. ID stainless steel tube at a calculated shear rate of 1.36 x 10⁵ sec⁻¹ show that, for equal number of passes, the lower the initial molecular weight of the polymer, the less the extent of degradation. An asymptotic value of the intrinsic viscosity is approached with pass number; shear stress has little effect on the intrinsic viscosity after one pass"--Abstract, leaf ii. |
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"An apparatus has been constructed to investigate the capillary shear degradation of polymer solutions. Maximum shear rates obtainable under flow conditions which could be characterized as nonturbulent were on the order of 10⁵ sec⁻¹. The effect of calculated shear rate, initial molecular weight, and number of passes through the capillary tube on the degradation of polystyrene (with ̄M[subscript v] from 22,000 to 1,770,000) solutions in toluene (0.1 wt.%) were studied. The tests in the 0.0105 in. ID stainless steel tube at a calculated shear rate of 1.36 x 10⁵ sec⁻¹ show that, for equal number of passes, the lower the initial molecular weight of the polymer, the less the extent of degradation. An asymptotic value of the intrinsic viscosity is approached with pass number; shear stress has little effect on the intrinsic viscosity after one pass"--Abstract, leaf ii. |
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