Effect of cyclic stress on enthalpy relaxation in polycarbonate
dc.contributor.author | Liu, Liang B. | en_US |
dc.contributor.author | Yee, Albert F. | en_US |
dc.contributor.author | Gidley, David W. | en_US |
dc.date.accessioned | 2006-04-28T18:20:17Z | |
dc.date.available | 2006-04-28T18:20:17Z | |
dc.date.issued | 1992-03-15 | en_US |
dc.identifier.citation | Liu, Liang B.; Yee, Albert F.; Gidley, David W. (1992)."Effect of cyclic stress on enthalpy relaxation in polycarbonate." Journal of Polymer Science Part B: Polymer Physics 30(3): 221-230. <http://hdl.handle.net/2027.42/38862> | en_US |
dc.identifier.issn | 0887-6266 | en_US |
dc.identifier.issn | 1099-0488 | en_US |
dc.identifier.uri | https://hdl.handle.net/2027.42/38862 | |
dc.description.abstract | Possible effects of cyclic stress on physical aging in polycarbonate were investigated using differential scanning calorimetry (DSC) measurements. When the enthalpy overshoot by DSC of specimens of different previous thermophysical aging histories is measured as a function of the cyclic stress amplitudes, two characteristic regimes are observed. By correlating with optical microscopic observations, these regimes are identified as the incubation and crazing stages (denoted regimes I and II, respectively). The enthalpy relaxation behavior in Regime I is similar to thermophysical aging, indicating that the glassy structure as a whole is initially shifted to one where molecular mobility is retarded by relatively low amplitude cyclic stress. A strong interaction is also seen between the enthalpy overshoot and previous physical aging. That is, the more the material is previously aged, and the shorter the incubation period, the longer the crazing region is. As a result, brittle failure occurs over a wider load range compared with less aged specimens. | en_US |
dc.format.extent | 802381 bytes | |
dc.format.extent | 3118 bytes | |
dc.format.mimetype | application/pdf | |
dc.format.mimetype | text/plain | |
dc.language.iso | en_US | |
dc.publisher | John Wiley & Sons, Inc. | en_US |
dc.subject.other | Chemistry | en_US |
dc.subject.other | Polymer and Materials Science | en_US |
dc.title | Effect of cyclic stress on enthalpy relaxation in polycarbonate | 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 | Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109 | en_US |
dc.contributor.affiliationum | Department of Materials Science and Engineering, 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.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/38862/1/090300301_ftp.pdf | en_US |
dc.identifier.doi | http://dx.doi.org/10.1002/polb.1992.090300301 | 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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