Examination of the Molecular Mass of Polyhydroxypolyamides

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dc.contributor.advisorManley-Harris, Merilyn
dc.contributor.authorFaville, Martynen_NZ
dc.date.accessioned2010-08-10T03:25:58Z
dc.date.available2010-08-10T03:25:58Z
dc.date.issued2010en_NZ
dc.description.abstractThe work described in this thesis investigated the use of size exclusion chromatography (SEC) to fractionate a variety of different polyhydroxypolyamide (PHPA) samples for analysis by matrix assisted laser desorption ionisation-time of flight spectrometry (MALDI-TOF). The molecular weights obtained via MALDI-TOF were then compared to those obtained by 1H nuclear magnetic resonance (NMR) end-group analysis. Deionised water was used as the solvent for SEC fractionation using KS sugar columns KS-804 and 805 in series. An issue with PHPA is the possibility that they may hydrolyse in water and also under elevated temperature. Since deionised water was used to prepare each sample and they were run through columns which were under elevated temperatures (50˚C) hydrolysis could occur during fractionation by SEC. Through 1H NMR degradation experiments at room temperature and at 50˚C, it was observed that degradation would not be a problem. Analysis of each PHPA sample on each KS sugar column showed fractions in the V0 region. These fractions make up the majority of the composition of unfractionated PHPA samples. There are two possible explanations for these fractions in this region, these are; 1) smaller ionised molecular weight PHPA polymers and 2) extremely high molecular weight PHPA polymer fractions. From the resulting SEC, MALDI and 1H NMR T2 relaxation rate measurements, it was concluded that these fractions are extremely high molecular weight polymer fractions. The size of these PHPA fractions means molecular weights cannot be determined for these fractions and for unfractionated PHPA samples due to the limitations of MALDI-TOF spectrometry and 1H NMR end group analysis. However MALDI-TOF and 1H NMR end-group analysis do give good predictions for low molecular weight PHPA fractions which are in agreement with each other.en_NZ
dc.format.mimetypeapplication/pdf
dc.identifier.citationFaville, M. (2010). Examination of the Molecular Mass of Polyhydroxypolyamides (Thesis, Master of Science (MSc)). The University of Waikato, Hamilton, New Zealand. Retrieved from https://hdl.handle.net/10289/4289en
dc.identifier.urihttps://hdl.handle.net/10289/4289
dc.language.isoen
dc.publisherThe University of Waikatoen_NZ
dc.rightsAll items in Research Commons are provided for private study and research purposes and are protected by copyright with all rights reserved unless otherwise indicated.
dc.subjectPolyhydroxypolyamidesen_NZ
dc.subjectSize Exclusion Chromatographyen_NZ
dc.subjectMALDI-TOFen_NZ
dc.subjectMolecular Weighten_NZ
dc.subject1H NMR end group analysisen_NZ
dc.subjectT1 and T2 Relaxation Ratesen_NZ
dc.titleExamination of the Molecular Mass of Polyhydroxypolyamidesen_NZ
dc.typeThesisen_NZ
pubs.place-of-publicationHamilton, New Zealanden_NZ
thesis.degree.disciplineChemistryen_NZ
thesis.degree.grantorUniversity of Waikatoen_NZ
thesis.degree.levelMasters
thesis.degree.nameMaster of Science (MSc)en_NZ
uow.date.accession2010-02-24en_NZ
uow.identifier.adthttp://adt.waikato.ac.nz/uploads/adt-uow20100224.152008
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