Abstract
The coupling of hydrodynamics to molecular orientation has been studied for a Langmuir film of the hairy-rod polymer poly(p-phenylene)sulfonic acid mixed with either arachidyl alcohol or 1,2-dimyristoyl-sn-glycero-3-phosphatidylcholine. These latter materials are small amphiphilic molecules. The orientational dynamics of the polymer under an extensional flow is examined using UV dichroism. The results reveal a surface pressure-induced isotropic−nematic transition, which is affected by polymer−solvent interactions as well as polymer−polymer interactions. An interfacial stress rheometer was used to further examine the existence of the surface pressure-induced transition. These structural and liquid crystalline transitions are difficult to observe using traditional pressure−area isotherm analysis.
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