Relationship between conformation and enthalpy or volume relaxation in polycarbonate
Identifieur interne : 001000 ( France/Analysis ); précédent : 000F99; suivant : 001001Relationship between conformation and enthalpy or volume relaxation in polycarbonate
Auteurs : N. Heymans [Belgique] ; B. Dequenne [France]Source :
- Polymer [ 0032-3861 ] ; 2001.
English descriptors
- KwdEn :
Abstract
Conformational changes are observed during sub-Tg annealing of solution-cast films of BPA–polycarbonate by following changes in the conformationally sensitive IR aromatic breathing band at 1600cm−1. The rate of conformational relaxation is compared with published data on enthalpy and volume relaxation on the same polymer. The relaxation rates and timescales converge in the immediate vicinity of Tg, but diverge at temperatures below Tg−15K and conformational energy only accounts for a very small fraction of observed enthalpy relaxation. The results suggest that a single process is active in volume and conformational relaxation and that at least two processes contribute to enthalpy relaxation.
Url:
DOI: 10.1016/S0032-3861(01)00017-9
Affiliations:
- Belgique, France
- Haute-Normandie, Région Normandie, Région de Bruxelles-Capitale
- Bruxelles, Le Havre
- Université libre de Bruxelles
Links toward previous steps (curation, corpus...)
- to stream Istex, to step Corpus: 000B61
- to stream Istex, to step Curation: 000B61
- to stream Istex, to step Checkpoint: 000848
- to stream Main, to step Merge: 001811
- to stream Main, to step Curation: 001768
- to stream Main, to step Exploration: 001768
- to stream France, to step Extraction: 001000
Links to Exploration step
ISTEX:4AE2E488DFEABD1FFBCAF071DB087050A51359E9Le document en format XML
<record><TEI wicri:istexFullTextTei="biblStruct"><teiHeader><fileDesc><titleStmt><title xml:lang="en">Relationship between conformation and enthalpy or volume relaxation in polycarbonate</title><author><name sortKey="Heymans, N" sort="Heymans, N" uniqKey="Heymans N" first="N." last="Heymans">N. Heymans</name></author><author><name sortKey="Dequenne, B" sort="Dequenne, B" uniqKey="Dequenne B" first="B." last="Dequenne">B. Dequenne</name></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:4AE2E488DFEABD1FFBCAF071DB087050A51359E9</idno><date when="2001" year="2001">2001</date><idno type="doi">10.1016/S0032-3861(01)00017-9</idno><idno type="url">https://api.istex.fr/document/4AE2E488DFEABD1FFBCAF071DB087050A51359E9/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">000B61</idno><idno type="wicri:Area/Istex/Curation">000B61</idno><idno type="wicri:Area/Istex/Checkpoint">000848</idno><idno type="wicri:doubleKey">0032-3861:2001:Heymans N:relationship:between:conformation</idno><idno type="wicri:Area/Main/Merge">001811</idno><idno type="wicri:Area/Main/Curation">001768</idno><idno type="wicri:Area/Main/Exploration">001768</idno><idno type="wicri:Area/France/Extraction">001000</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a" type="main" xml:lang="en">Relationship between conformation and enthalpy or volume relaxation in polycarbonate</title><author><name sortKey="Heymans, N" sort="Heymans, N" uniqKey="Heymans N" first="N." last="Heymans">N. Heymans</name><affiliation wicri:level="1"><country wicri:rule="url">Belgique</country></affiliation><affiliation wicri:level="4"><country xml:lang="fr">Belgique</country><wicri:regionArea>Physique des Matériaux de Synthèse 194/08, Université Libre de Bruxelles, B-1050 Bruxelles</wicri:regionArea><orgName type="university">Université libre de Bruxelles</orgName><placeName><settlement type="city">Bruxelles</settlement><region type="region" nuts="2">Région de Bruxelles-Capitale</region></placeName></affiliation></author><author><name sortKey="Dequenne, B" sort="Dequenne, B" uniqKey="Dequenne B" first="B." last="Dequenne">B. Dequenne</name><affiliation wicri:level="3"><country xml:lang="fr">France</country><wicri:regionArea>51, rue Flore, F-76600 Le Havre</wicri:regionArea><placeName><region type="region" nuts="2">Région Normandie</region><region type="old region" nuts="2">Haute-Normandie</region><settlement type="city">Le Havre</settlement></placeName></affiliation></author></analytic><monogr></monogr><series><title level="j">Polymer</title><title level="j" type="abbrev">JPOL</title><idno type="ISSN">0032-3861</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="2001">2001</date><biblScope unit="volume">42</biblScope><biblScope unit="issue">12</biblScope><biblScope unit="page" from="5337">5337</biblScope><biblScope unit="page" to="5342">5342</biblScope></imprint><idno type="ISSN">0032-3861</idno></series><idno type="istex">4AE2E488DFEABD1FFBCAF071DB087050A51359E9</idno><idno type="DOI">10.1016/S0032-3861(01)00017-9</idno><idno type="PII">S0032-3861(01)00017-9</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0032-3861</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Annealing</term><term>FTIR</term><term>Polycarbonate</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Conformational changes are observed during sub-Tg annealing of solution-cast films of BPA–polycarbonate by following changes in the conformationally sensitive IR aromatic breathing band at 1600cm−1. The rate of conformational relaxation is compared with published data on enthalpy and volume relaxation on the same polymer. The relaxation rates and timescales converge in the immediate vicinity of Tg, but diverge at temperatures below Tg−15K and conformational energy only accounts for a very small fraction of observed enthalpy relaxation. The results suggest that a single process is active in volume and conformational relaxation and that at least two processes contribute to enthalpy relaxation.</div></front></TEI><affiliations><list><country><li>Belgique</li><li>France</li></country><region><li>Haute-Normandie</li><li>Région Normandie</li><li>Région de Bruxelles-Capitale</li></region><settlement><li>Bruxelles</li><li>Le Havre</li></settlement><orgName><li>Université libre de Bruxelles</li></orgName></list><tree><country name="Belgique"><noRegion><name sortKey="Heymans, N" sort="Heymans, N" uniqKey="Heymans N" first="N." last="Heymans">N. Heymans</name></noRegion><name sortKey="Heymans, N" sort="Heymans, N" uniqKey="Heymans N" first="N." last="Heymans">N. Heymans</name></country><country name="France"><region name="Région Normandie"><name sortKey="Dequenne, B" sort="Dequenne, B" uniqKey="Dequenne B" first="B." last="Dequenne">B. Dequenne</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
EXPLOR_STEP=$WICRI_ROOT/Wicri/France/explor/LeHavreV1/Data/France/Analysis
HfdSelect -h $EXPLOR_STEP/biblio.hfd -nk 001000 | SxmlIndent | more
Ou
HfdSelect -h $EXPLOR_AREA/Data/France/Analysis/biblio.hfd -nk 001000 | SxmlIndent | more
Pour mettre un lien sur cette page dans le réseau Wicri
{{Explor lien
|wiki= Wicri/France
|area= LeHavreV1
|flux= France
|étape= Analysis
|type= RBID
|clé= ISTEX:4AE2E488DFEABD1FFBCAF071DB087050A51359E9
|texte= Relationship between conformation and enthalpy or volume relaxation in polycarbonate
}}
| This area was generated with Dilib version V0.6.25. |  |