An experimentally disigned melt rheological characterization of starblock polymers
| dc.contributor.author | Scott, James Marvin | en |
| dc.contributor.department | Chemical Engineering | en |
| dc.date.accessioned | 2019-07-03T16:42:46Z | en |
| dc.date.available | 2019-07-03T16:42:46Z | en |
| dc.date.issued | 1986 | en |
| dc.description.abstract | The melt rheological behavior of structurally defined starblock polymers was investigated using the experimental design technique of response surface methodology. A rotatable central composite design (ccd) was employed with linear 2⁵ factorial structure and with axial points to fit the pure quadratic terms. Regression analysis of rheological data from styrene-isoprene and t-butyl styrene-isoprene starblock polymers was used to generate four models whose terms have a p-value ≤ 0.1. The fitted models of viscosity and elasticity were a function of temperature, weight percent uncombined diblock, frequency, casting solvent, and annealing time. Changes in melt behavior were hypothesized to be dependent on mechanisms related to phase separation and/or architecture. The modeled behavior verified the proposed mechanisms enabling a generalization of the results to the melt behavior of block polymer systems. The guidelines for the applicability of the well known Cox-Mertz relation and WLF superposition technique, as well as the transition to the Forced High Elasticity State, are discussed in terms of melt connectivity and elasticity. | en |
| dc.description.degree | M.S. | en |
| dc.format.extent | x, 124 leaves | en |
| dc.format.mimetype | application/pdf | en |
| dc.identifier.uri | http://hdl.handle.net/10919/90960 | en |
| dc.language.iso | en_US | en |
| dc.publisher | Virginia Polytechnic Institute and State University | en |
| dc.relation.isformatof | OCLC# 15788178 | en |
| dc.rights | In Copyright | en |
| dc.rights.uri | http://rightsstatements.org/vocab/InC/1.0/ | en |
| dc.subject.lcc | LD5655.V855 1986.S4675 | en |
| dc.subject.lcsh | Rheology | en |
| dc.subject.lcsh | Polymers -- Rheology | en |
| dc.title | An experimentally disigned melt rheological characterization of starblock polymers | en |
| dc.type | Thesis | en |
| dc.type.dcmitype | Text | en |
| thesis.degree.discipline | Chemical Engineering | en |
| thesis.degree.grantor | Virginia Polytechnic Institute and State University | en |
| thesis.degree.level | masters | en |
| thesis.degree.name | M.S. | en |
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