The nature and determination of the dynamic glass transition temperature in polymeric liquids
dc.contributor.author | Mlynarczyk, Paul John | en_US |
dc.date.accessioned | 2014-05-20T15:15:22Z | |
dc.date.available | 2014-05-20T15:15:22Z | |
dc.date.graduationmonth | August | en_US |
dc.date.issued | 2014-05-20 | |
dc.date.published | 2014 | en_US |
dc.description.abstract | A polymer has drastically different physical properties above versus below some characteristic temperature. For this reason, the precise identification of this glass transition temperature, T[subscript]g, is critical in evaluating product feasibility for a given application. The objective of this report is to review the behavior of polymers near their T[subscript]g and assess the capability of predicting T[subscript]g using theoretical and empirical models. It was determined that all polymers begin to undergo structural relaxation at various temperatures both nearly above and below T[subscript]g, and that practical assessment of a single consistent T[subscript]g is successfully performed through consideration of only immediate thermal history and thermodynamic properties. It was found that the best quantitative structure-property relationship (QSPR) models accurately predict T[subscript]g of polymers of theoretically infinite chain length with an average error of less than 20 K or about 6%, while T[subscript]g prediction for shorter polymers must be done by supplementing these T[subscript]g (∞) values with configurational entropy or molecular weight relational models. These latter models were found to be reliable only for polymers of molecular weight greater than about 2,000 g/mol and possessing a T[subscript]g (∞) of less than about 400 K. | en_US |
dc.description.advisor | Jennifer L. Anthony | en_US |
dc.description.degree | Master of Science | en_US |
dc.description.department | Department of Chemical Engineering | en_US |
dc.description.level | Masters | en_US |
dc.identifier.uri | http://hdl.handle.net/2097/17782 | |
dc.language.iso | en_US | en_US |
dc.publisher | Kansas State University | en |
dc.subject | Structural relaxation | en_US |
dc.subject | Polymer science | en_US |
dc.subject | Glass transition temperature | en_US |
dc.subject | Quantitative structure-property relationship | en_US |
dc.subject.umi | Chemical Engineering (0542) | en_US |
dc.subject.umi | Polymer Chemistry (0495) | en_US |
dc.title | The nature and determination of the dynamic glass transition temperature in polymeric liquids | en_US |
dc.type | Report | en_US |