| Summary: | 碩士 === 東海大學 === 化學工程學系 === 87 === The rheological behavior of the mixture of polymer, poly butyl acrylate (PBA) and cholesteric liquid crystal, cholesteryl oleyl carbonate (ChOC) was investigated. We used rotational rheometer RDAⅡ to do dynamic strain/frequency sweep tests, transient step rate tests, and steady rate sweep tests.
In dynamic frequency sweep tests, dynamic storage modulus G'' increases with PBA concentration. But when PBA concentration is over 80%, G'' decreases. This tells us that suspensions have solid elastic behavior.
Several theoretical equations predict that viscosity increase when phase volume increase. But in our steady rate sweep tests, it only established in low phase volume and low shear rate for ChOC/PBA mixtures in our case. And for PBA/ChOC mixtures, shear viscosity was overpredicted in certain concentration. We also got a conclusion that theoretical equations that predict viscosity can''t handle the case which droplets deformed.
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