Abstract
Shearing at constant gradient of polyisobutylene (PIB) solutions in viscous polybutene oils results in time dependent changes of their viscosities. Two PIB fractions (M=8·106 and 3.8·106) have been studied in a variety of solvents, covering the viscosity range from 5 to 0.5·10−2 poise. The overall phenomenon is similar to that already observed for polymethylmethacrylate, polystyrene, and polyethylene oxide solutions in Aroclor.
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