{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,26]],"date-time":"2026-02-26T18:23:11Z","timestamp":1772130191073,"version":"3.50.1"},"reference-count":50,"publisher":"Wiley","issue":"14","license":[{"start":{"date-parts":[[2006,7,17]],"date-time":"2006-07-17T00:00:00Z","timestamp":1153094400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Macro Chemistry &amp; Physics"],"published-print":{"date-parts":[[2006,7,24]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p><jats:bold>Summary:<\/jats:bold> Semicrystalline specimens of poly(<jats:sc>L<\/jats:sc>\u2010lactic acid) (PLLA) were prepared by isothermal cold\u2010 or melt\u2010crystallization over a wide temperature range. The morphologies at different length scales were characterized using polarized optical microscopy, WAXS and SAXS. The glass transition temperature (<jats:italic>T<\/jats:italic><jats:sub>g<\/jats:sub>), determined calorimetrically, exhibited a general decrease with an increase in crystallization temperature (<jats:italic>T<\/jats:italic><jats:sub>c<\/jats:sub>) for either cold\u2010 or melt\u2010crystallized specimens. The measurements of the heat capacity increment at <jats:italic>T<\/jats:italic><jats:sub>g<\/jats:sub> indicated that a significant amount of the rigid amorphous fraction coexisted with the crystalline and mobile amorphous phases in semicrystalline PLLA. A three\u2010phase model (crystalline phase, mobile amorphous phase and rigid amorphous phase) is, therefore, appropriate for the interpretation of the structure of semicrystalline PLLA. According to a one\u2010dimensional layer stack model, the layer thicknesses of the three phases were further evaluated approximately. The increasing of <jats:italic>T<\/jats:italic><jats:sub>g<\/jats:sub> was found to be correlated to significant decreasing thickness of the crystalline layer, gradual decreasing thickness of the rigid amorphous layer, and a slight increasing trend in the thickness of the mobile amorphous layer. We suggest that the rigid amorphous layer of semicrystalline PLLA may possibly play a role in loosening the constraints imposed by the crystalline layer on the amorphous chain motions inherent to the glass transition.<\/jats:p><jats:p><jats:boxed-text content-type=\"graphic\" position=\"anchor\"><jats:caption><jats:p>The optical microscopy photograph shows the spherulitic morphologies developed after melt crystallization at 140\u2009\u00b0C.<\/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>The optical microscopy photograph shows the spherulitic morphologies developed after melt crystallization at 140\u2009\u00b0C.<\/jats:p><\/jats:caption><\/jats:graphic><\/jats:boxed-text>\n<\/jats:p>","DOI":"10.1002\/macp.200600114","type":"journal-article","created":{"date-parts":[[2006,7,17]],"date-time":"2006-07-17T12:16:33Z","timestamp":1153138593000},"page":"1262-1271","source":"Crossref","is-referenced-by-count":97,"title":["Influence of Semicrystalline Morphology on the Glass Transition of Poly(<scp>L<\/scp>\u2010lactic acid)"],"prefix":"10.1002","volume":"207","author":[{"given":"Yaming","family":"Wang","sequence":"first","affiliation":[]},{"given":"S\u00e9rgio S.","family":"Funari","sequence":"additional","affiliation":[]},{"given":"Jo\u00e3o F.","family":"Mano","sequence":"additional","affiliation":[]}],"member":"311","published-online":{"date-parts":[[2006,7,17]]},"reference":[{"key":"e_1_2_6_1_2","doi-asserted-by":"publisher","DOI":"10.1126\/science.8493529"},{"key":"e_1_2_6_2_2","doi-asserted-by":"publisher","DOI":"10.1002\/(SICI)1521-3927(20000201)21:3<117::AID-MARC117>3.0.CO;2-X"},{"key":"e_1_2_6_3_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.biomaterials.2003.09.011"},{"key":"e_1_2_6_4_2","doi-asserted-by":"publisher","DOI":"10.1016\/S0032-3861(98)00846-5"},{"key":"e_1_2_6_5_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.biomaterials.2005.03.002"},{"key":"e_1_2_6_6_2","doi-asserted-by":"publisher","DOI":"10.1002\/mabi.200400199"},{"key":"e_1_2_6_7_2","doi-asserted-by":"publisher","DOI":"10.1016\/0032-3861(92)90440-8"},{"key":"e_1_2_6_8_2","doi-asserted-by":"publisher","DOI":"10.1002\/app.22643"},{"key":"e_1_2_6_9_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.polymer.2005.06.096"},{"key":"e_1_2_6_10_2","doi-asserted-by":"publisher","DOI":"10.1021\/ma047934i"},{"key":"e_1_2_6_11_2","doi-asserted-by":"publisher","DOI":"10.1002\/marc.200500319"},{"key":"e_1_2_6_12_2","doi-asserted-by":"publisher","DOI":"10.1002\/(SICI)1097-4628(19970502)64:5<911::AID-APP11>3.0.CO;2-W"},{"key":"e_1_2_6_13_2","doi-asserted-by":"publisher","DOI":"10.1021\/ma00161a015"},{"key":"e_1_2_6_14_2","doi-asserted-by":"publisher","DOI":"10.1007\/BF01979446"},{"key":"e_1_2_6_15_2","doi-asserted-by":"publisher","DOI":"10.1021\/ma00177a028"},{"key":"e_1_2_6_16_2","first-page":"239","volume":"30","author":"Huo P.","year":"1992","journal-title":"Colloid Polym. 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