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Crystallization kinetics and crystal morphology of ultrathin polycaprolactone films directed by supercritical carbon dioxide.

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dc.contributor.advisor Koga, Tadanori en_US
dc.contributor.author Sen, Mani Kuntal en_US
dc.contributor.other Department of Materials Science and Engineering. en_US
dc.date.accessioned 2017-09-20T16:50:04Z
dc.date.available 2017-09-20T16:50:04Z
dc.date.issued 2012-12-01
dc.identifier.uri http://hdl.handle.net/11401/76344 en_US
dc.description 40 pg. en_US
dc.description.abstract The effects of supercritical carbon dioxide (scCO2) as an effective plasticization agent on the crystallization kinetics and crystal morphology of ultrathin polycaprolactone (PCL) films (less than 100nm in thickness) were studied by using various techniques including optical microscopy, atomic force microscopy, and x-ray scattering experiments. As a result, it is found that the PCL chains form " flat-on" lamellae, where the lamellar layers run parallel to the substrate surface, irrespective of the CO2 process conditions and the film thickness. It was also found that the unique scCO2 conditions near the critical point (critical temperature (Tc) =31.3°C and critical pressure (PC) =7.38MPa) result in the significant enhancement of the crystal size compared to those under the other scCO2 process conditions or conventional high-temperature annealing process. Furthermore, it was found that scCO2 induces the secondary heterogeneous nucleation of the excess melt on the film surface during the isothermal re-crystallization process. en_US
dc.description.sponsorship This work is sponsored by the Stony Brook University Graduate School in compliance with the requirements for completion of degree. en_US
dc.format Monograph en_US
dc.format.medium Electronic Resource en_US
dc.language.iso en_US en_US
dc.publisher The Graduate School, Stony Brook University: Stony Brook, NY. en_US
dc.subject.lcsh Materials Science en_US
dc.subject.other crystallization, lamellar orientation, overgrowth morphology, Polycaprolactone, semi-crystalline polymer, supercritical carbon dioxide en_US
dc.title Crystallization kinetics and crystal morphology of ultrathin polycaprolactone films directed by supercritical carbon dioxide. en_US
dc.type Thesis en_US
dc.mimetype Application/PDF en_US
dc.contributor.committeemember Venkatesh, T en_US
dc.contributor.committeemember Gersappe, Dilip. en_US


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