dc.contributor.advisor |
Professor J. H. Percy |
en |
dc.contributor.advisor |
Professor A. L. Titchener |
en |
dc.contributor.author |
Dao, Kim Chung, 1941- |
en |
dc.date.accessioned |
2008-05-29T22:05:40Z |
en |
dc.date.available |
2008-05-29T22:05:40Z |
en |
dc.date.issued |
1971 |
en |
dc.identifier.citation |
Thesis (PhD--Engineering)--University of Auckland, 1971. |
en |
dc.identifier.uri |
http://hdl.handle.net/2292/2530 |
en |
dc.description.abstract |
Specimens of high-density low-density polyethylene were uniaxially compressed at nominally constant strain-rates ranging from 0.000066 to 0.66 sec-1 at temperatures from 77° to 350°K and hydrostatic pressures from 0.001(latm) to 4 K bar.
It was shown that there were significant effects of temperature, pressure and strain rate on both polyethylenes.
At small strains (O.O1), the time-temperature and time-pressure superpositions were used successfully to construct the master curves of stress versus reduced strain-rate. These master curves, which were found to have been taken in the range of linear-viscoelastic behaviour of the polymers, were employed to derive the stress-relaxation moduli and the relaxation spectra.
The viscoelastic response to temperature and pressure of high-density polyethylene in the transition zone between the γ and α relaxations, and that of low-density polyethylene in the transition zone between the γ and β relaxations have been found to be controlled by the same molecular motion. This motion, an Arrhenius-type activated process, was identified as involving molecular segments of six to eight carbon atoms with an activation energy of 22 Kcal/mole and an activation volume of 110 cm3/mole. |
en |
dc.format |
Scanned from print thesis |
en |
dc.language.iso |
en |
en |
dc.publisher |
ResearchSpace@Auckland |
en |
dc.relation.ispartof |
PhD Thesis - University of Auckland |
en |
dc.relation.isreferencedby |
UoA749994 |
en |
dc.rights |
Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. |
en |
dc.rights.uri |
https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm |
en |
dc.title |
Viscoelastic response of polyethylene to temperature and pressure |
en |
dc.type |
Thesis |
en |
thesis.degree.discipline |
Engineering |
en |
thesis.degree.grantor |
The University of Auckland |
en |
thesis.degree.level |
Doctoral |
en |
thesis.degree.name |
PhD |
en |
dc.subject.marsden |
Fields of Research::290000 Engineering and Technology |
en |
dc.rights.holder |
Copyright: The author |
en |
pubs.local.anzsrc |
09 - Engineering |
en |
pubs.org-id |
Faculty of Engineering |
en |
dc.identifier.wikidata |
Q112837986 |
|