The overall crystallization kinetics of isotactic polystyrene (i-PS), polyethylene terephthalate (PET), and their nucleant-filled composites were examined using differential scanning calorimetry (D.S.C.). The study also included a photomicroscopic analysis of the number of nuclei formed per unit area and the spherulitic growth rate for i-PS and nucleated i-PS. / The isothermal crystallization of PET and i-PS showed that in some systems the addition of nucleant caused a slowing down of the crystallization process. This is the first reported observation of the retardation of rate in the presence of particular nucleant. The results are interpreted on the basis that the nucleant is inhibiting the growth of the crystals and thus slowing the overall rate of crystallization. Microscopic measurements of i-PS spherulites showed that the addition of silica reduced the radial growth rate. The data are analyzed by current theory and an extension to that theory is proposed which relates the polymer-nucleant interaction energy to the spherulitic growth rate of a nucleated system.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.77097 |
| Date | January 1981 |
| Creators | Turturro, Giulio. |
| Publisher | McGill University |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Format | application/pdf |
| Coverage | Doctor of Philosophy (Department of Chemistry) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: 000112879, proquestno: AAINK52161, Theses scanned by UMI/ProQuest. |
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