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Weshowforthefirsttimethatentangledpolymericliquidscontaininglong-chainbranchingcanexhibitstrainhardeninguponstartupshear.Asthesignificantlong-chainbranchingimpedeschaindisentangle-ment,GaussiancoilsbetweenentanglementscandeformtoreachthefiniteextensibilitylimitwheretheintrachainretractionforceexceedsthevalueexpectedfromtheusualconformationalentropylossevaluatedbasedonGaussianchainstatistics.Thephenomenonisexpectedtoleadtofurthertheoreticalunderstanding. |
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