Abstract
Simultaneous measurement of IR dichroism and birefringence is used to examine the component relaxation in bidisperse, fully entangled melts of polybutadienes with 1% of the repeating units modified with 4-phenyl-1,2,4-trixoline-3,5-dione (urazole) groups. Since the urazole groups are capable of forming interchain hydrogen bonds, the rheological properties of these materials differ significantly from those of the analogous polybutadiene melts without polar stickers. Samples with 30, 50, and 70% long chains are examined by step strain and oscillatory shear experiments. In addition, the step strain experiments are carried out at two temperatures
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