{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,28]],"date-time":"2025-10-28T18:13:18Z","timestamp":1761675198502},"reference-count":43,"publisher":"Wiley","issue":"4","license":[{"start":{"date-parts":[[2005,4,21]],"date-time":"2005-04-21T00:00:00Z","timestamp":1114041600000},"content-version":"vor","delay-in-days":2,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Macromolecular Bioscience"],"published-print":{"date-parts":[[2005,4,19]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p><jats:bold>Summary:<\/jats:bold> The glass transition of poly(<jats:sc>L<\/jats:sc>\u2010lactic acid) (PLLA) occurs not far above typical service temperatures (room or body temperatures) which has consequences on the material properties during its use, such as damping or the occurrence of structural relaxation. This work aims at characterising the glass transition dynamics of a semi\u2010crystalline PLLA using both dynamic mechanical analysis (DMA) and thermally stimulated recovery (TSR). The main viscoelastic parameters have been characterised at 1 Hz using DMA and the master curve obtained after isothermal experiments at different temperatures provided a full picture of the solid\u2010state rheological behaviour throughout a wide frequency range. The activation energies calculated from the shift factors agree with the TSR ones, exhibiting a maximum near the <jats:italic>T<\/jats:italic><jats:sub>g<\/jats:sub>. Above the <jats:italic>T<\/jats:italic><jats:sub>g<\/jats:sub>, the results can be described with the WLF model. In the glassy state, the activation energy decreases with decreasing temperatures being always higher than the prediction of the Adam and Gibbs theory, at least down to temperatures 30\u2009\u00b0C below the <jats:italic>T<\/jats:italic><jats:sub>g<\/jats:sub>. This suggests the existence of non\u2010arrested degrees of freedom in the glassy state, being consistent with the existence of a significant degree of cooperativity in the TSR results.<\/jats:p><jats:p><jats:boxed-text content-type=\"graphic\" position=\"anchor\"><jats:caption><jats:p>Temperature dependence of the apparent activation energy across the glass transition.<\/jats:p><\/jats:caption><jats:graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" mimetype=\"image\/jpeg\" position=\"anchor\" specific-use=\"enlarged-web-image\" xlink:href=\"graphic\/mgra001.jpg\"><jats:alt-text>magnified image<\/jats:alt-text><jats:caption><jats:p>Temperature dependence of the apparent activation energy across the glass transition.<\/jats:p><\/jats:caption><\/jats:graphic><\/jats:boxed-text>\n<\/jats:p>","DOI":"10.1002\/mabi.200400199","type":"journal-article","created":{"date-parts":[[2005,4,21]],"date-time":"2005-04-21T09:18:06Z","timestamp":1114075086000},"page":"337-343","source":"Crossref","is-referenced-by-count":12,"title":["Study of the Segmental Dynamics in Semi\u2010Crystalline Poly(lactic acid) using Mechanical Spectroscopies"],"prefix":"10.1002","volume":"5","author":[{"given":"Jo\u00e3o F.","family":"Mano","sequence":"first","affiliation":[]}],"member":"311","published-online":{"date-parts":[[2005,4,21]]},"reference":[{"key":"e_1_2_6_1_2","doi-asserted-by":"publisher","DOI":"10.1080\/10601329508010289"},{"key":"e_1_2_6_2_2","doi-asserted-by":"publisher","DOI":"10.1016\/S0079-6700(02)00012-6"},{"key":"e_1_2_6_3_2","doi-asserted-by":"publisher","DOI":"10.1007\/3540587888_18"},{"key":"e_1_2_6_4_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.biomaterials.2003.09.011"},{"key":"e_1_2_6_5_2","doi-asserted-by":"publisher","DOI":"10.1016\/0022-3093(94)90321-2"},{"key":"e_1_2_6_6_2","doi-asserted-by":"publisher","DOI":"10.1016\/0079-6700(94)00001-I"},{"key":"e_1_2_6_7_2","doi-asserted-by":"publisher","DOI":"10.1021\/ma0203647"},{"key":"e_1_2_6_8_2","doi-asserted-by":"publisher","DOI":"10.1021\/ma035597s"},{"key":"e_1_2_6_9_2","author":"Wang Y.","journal-title":"Macromolecules"},{"key":"e_1_2_6_10_2","unstructured":"J. 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