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The liquid chromatography of aromatic diamines: analytical and preparative

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dc.contributor.authorYoung, Philip Rossen
dc.contributor.departmentChemistryen
dc.date.accessioned2016-04-07T16:08:08Zen
dc.date.available2016-04-07T16:08:08Zen
dc.date.issued1975en
dc.description.abstractLiquid chromatographic methods were developed for determining the purity, reactivity, and preparative separation of aromatic diamine isomers used in the synthesis of aromatic polyimides. Approximately 50 diamine isomers were separated on various silica gels using chloroform and/or cyclohexane mobile phases. A linear relationship between pK<sub>b</sub>, and log of the capacity factor was discovered for four series of simple aromatic amines. This suggested that the relative basicities of more complex diamine isomers might be established from chromatographic retention data. A chromatographic basicity index for two series of isomers was then proposed and correlated with polymer viscosity measurements. Several parameters which can affect the efficiency of preparative separations of diamine monomers were also evaluated. These parameters included the effect of the column packing technique, flow rate, column diameter and length, adsorbent surface area and particle size, and column capacity. The results of this evaluation indicate that preparative liquid chromatography can be used to prepare highly purified milligram quantities of monomers for polymer synthesis.en
dc.description.degreePh. D.en
dc.format.extentv, 83 leavesen
dc.format.mimetypeapplication/pdfen
dc.identifier.urihttp://hdl.handle.net/10919/65077en
dc.language.isoenen
dc.publisherVirginia Polytechnic Institute and State Universityen
dc.relation.isformatofOCLC# 21263007en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V856 1975.Y69en
dc.titleThe liquid chromatography of aromatic diamines: analytical and preparativeen
dc.typeDissertationen
dc.type.dcmitypeTexten
thesis.degree.disciplineChemistryen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

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