Nanovoid relaxation in a series of copolyester glasses under cyclic loading using synchronous PALS
dc.contributor.author | Sun, Nanjian | en_US |
dc.contributor.author | Liu, Jianwei | en_US |
dc.contributor.author | Dull, Terry L. | en_US |
dc.contributor.author | Yee, Albert F. | en_US |
dc.date.accessioned | 2007-09-20T18:47:46Z | |
dc.date.available | 2008-09-08T14:25:13Z | en_US |
dc.date.issued | 2007-06-15 | en_US |
dc.identifier.citation | Sun, Nanjian; Liu, Jianwei; Dull, Terry; Yee, Albert F. (2007)."Nanovoid relaxation in a series of copolyester glasses under cyclic loading using synchronous PALS." Journal of Polymer Science Part B: Polymer Physics 45(12): 1410-1417. <http://hdl.handle.net/2027.42/56077> | en_US |
dc.identifier.issn | 0887-6266 | en_US |
dc.identifier.issn | 1099-0488 | en_US |
dc.identifier.uri | https://hdl.handle.net/2027.42/56077 | |
dc.description.abstract | This study examines if correlation between a specific molecular motion and the growth and relaxation of nanovoids, which are precursors to crazes, can be established. A novel technique, positronium annihilation lifetime spectroscopy (PALS) synchronized with cyclic stress, is reported. In this technique the positronium annihilation signal was accumulated in sixteen channels corresponding to sixteen phases of the sinusoidal load, which allowed statistically significant data for nanovoid generation and relaxation due to the fluctuating stress to be accumulated. This technique was applied to a series of copolymers of poly(ethylene terephthalate) (PET) and poly(1,4-cyclohexylenedimethylene terephthalate) (PCT). Previous studies have shown that the cyclohexylene rings in the main chain of PCT actively undergo chair-boat-chair conformational transitions in the glassy PCT at around room temperature. The PET-co-PCT series was also chosen for this study because the crazing stress increases systematically with the cyclohexylene content. The synchronized PALS data are consistent with the hypothesis that transient nanovoids generated by the cyclic stress in polymers containing more cyclohexylene rings relax more readily than those with fewer rings. The results also correlate well with the crazing stress in this series of copolymers. © 2007 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 45: 1410–1417, 2007 | en_US |
dc.format.extent | 320618 bytes | |
dc.format.extent | 3118 bytes | |
dc.format.mimetype | application/pdf | |
dc.format.mimetype | text/plain | |
dc.publisher | Wiley Subscription Services, Inc., A Wiley Company | en_US |
dc.subject.other | Chemistry | en_US |
dc.subject.other | Polymer and Materials Science | en_US |
dc.title | Nanovoid relaxation in a series of copolyester glasses under cyclic loading using synchronous PALS | en_US |
dc.type | Article | en_US |
dc.rights.robots | IndexNoFollow | en_US |
dc.subject.hlbsecondlevel | Materials Science and Engineering | en_US |
dc.subject.hlbtoplevel | Engineering | en_US |
dc.description.peerreviewed | Peer Reviewed | en_US |
dc.contributor.affiliationum | Macromolecular Science and Engineering Center, University of Michigan, Ann Arbor, Michigan 48109 | en_US |
dc.contributor.affiliationum | Macromolecular Science and Engineering Center, University of Michigan, Ann Arbor, Michigan 48109 | en_US |
dc.contributor.affiliationum | Department of Physics, University of Michigan, Ann Arbor, Michigan 48109 | en_US |
dc.contributor.affiliationum | Macromolecular Science and Engineering Center, University of Michigan, Ann Arbor, Michigan 48109 ; Department of Chemical Engineering and Materials Science, University of California, Irvine, California 92697 ; Macromolecular Science and Engineering Center, University of Michigan, Ann Arbor, Michigan 48109 | en_US |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/56077/1/21168_ftp.pdf | en_US |
dc.identifier.doi | http://dx.doi.org/10.1002/polb.21168 | en_US |
dc.identifier.source | Journal of Polymer Science Part B: Polymer Physics | en_US |
dc.owningcollname | Interdisciplinary and Peer-Reviewed |
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