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Imaging and quantifying the different crystalline structures of polypropylene with the atomic force microscope
Thesis (MSc (Chemistry and Polymer Science))--University of Stellenbosch, 2006.
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| Format: | Thesis |
| Language: | English |
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Stellenbosch : University of Stellenbosch
2008
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| _version_ | 1867614032779804672 |
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| access_status_str | Open Access |
| author | Klash, Abdalah |
| author2 | Meincken, M. |
| author_browse | Klash, Abdalah Meincken, M. |
| author_facet | Meincken, M. Klash, Abdalah |
| author_sort | Klash, Abdalah |
| collection | Thesis |
| dc_rights_str_mv | University of Stellenbosch |
| description | Thesis (MSc (Chemistry and Polymer Science))--University of Stellenbosch, 2006. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/3007 |
| institution | Stellenbosch University (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:45:35.384Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2008 |
| publishDateRange | 2008 |
| publishDateSort | 2008 |
| publisher | Stellenbosch : University of Stellenbosch |
| publisherStr | Stellenbosch : University of Stellenbosch |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/3007 Imaging and quantifying the different crystalline structures of polypropylene with the atomic force microscope Klash, Abdalah Meincken, M. Van Reenen, A. University of Stellenbosch. Faculty of Science. Dept. of Chemistry and Polymer Science. Polypropylene Polyolefins Dissertations -- Polymer science Theses -- Polymer science Chemistry and Polymer Science Thesis (MSc (Chemistry and Polymer Science))--University of Stellenbosch, 2006. Isotactic polypropylene (iPP) exists in four different crystalline phases: α-, β-, γ- and the mesomorphic (smectic) form. The α-phase is probably the most predominant form of iPP with a monoclinic unit cell, whereas the unit cell of the γ-phase is orthorhombic. The aim of this study was to examine the ability of AFM to identify the α and γ crystalline forms of polypropylene and polypropylene copolymers that were not especially treated. Spherulites imaged on propylene-ethylene random copolymer surfaces had diameters ranging from 10-30μm and predominantly radial lamellae. The cross-hatching phenomenon of isotactic polypropylene was observed for samples containing both the α- and γ-phase. Two types of γ-phase spherulites were observed, namely a featherlike form for samples with a high content of the γ-phase and a bundle-like form with varying sizes, which is typical for the mixed structure of both α- and γ-forms. In some images of polypropylene-ethylene copolymer sample lozenge-shaped structures could be observed between the γ-spherulites, which might be single polyethylene crystals. Both the α- and γ-phase of iPP were successfully imaged and identified with AFM without prior treatment of the surface. The degree of crystallinity obtained from AFM images was calculated as a percentage of the surface area exhibiting regular structures. The results compared well to X-ray results. 2008-07-16T08:19:09Z 2010-06-01T09:03:45Z 2008-07-16T08:19:09Z 2010-06-01T09:03:45Z 2006-03 Thesis http://hdl.handle.net/10019.1/3007 en University of Stellenbosch application/pdf Stellenbosch : University of Stellenbosch |
| spellingShingle | Polypropylene Polyolefins Dissertations -- Polymer science Theses -- Polymer science Chemistry and Polymer Science Klash, Abdalah Imaging and quantifying the different crystalline structures of polypropylene with the atomic force microscope |
| title | Imaging and quantifying the different crystalline structures of polypropylene with the atomic force microscope |
| title_full | Imaging and quantifying the different crystalline structures of polypropylene with the atomic force microscope |
| title_fullStr | Imaging and quantifying the different crystalline structures of polypropylene with the atomic force microscope |
| title_full_unstemmed | Imaging and quantifying the different crystalline structures of polypropylene with the atomic force microscope |
| title_short | Imaging and quantifying the different crystalline structures of polypropylene with the atomic force microscope |
| title_sort | imaging and quantifying the different crystalline structures of polypropylene with the atomic force microscope |
| topic | Polypropylene Polyolefins Dissertations -- Polymer science Theses -- Polymer science Chemistry and Polymer Science |
| url | http://hdl.handle.net/10019.1/3007 |
| work_keys_str_mv | AT klashabdalah imagingandquantifyingthedifferentcrystallinestructuresofpolypropylenewiththeatomicforcemicroscope |