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Rapid Commun."],"published-print":{"date-parts":[[2026,4]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>\n                    Isotactic polybutene\u20101 (PB\u20101) shows peculiar crystallization behavior during crystallization from the melt, the metastable form II is always obtained. During aging at room temperature, the metastable crystals further undergo a solid\u2010solid transition into the stable form I with a corresponding change in volume. Therefore, direct formation of the stable crystalline form I\u2019 in PB\u20101 has attracted significant attention in research. In this work, we report a molar mass (\n                    <jats:italic>M<\/jats:italic>\n                    <jats:sub>w<\/jats:sub>\n                    ) dependency of polymorph selection in PB\u20101 under compressed carbon dioxide (CO\n                    <jats:sub>2<\/jats:sub>\n                    ). PB\u20101 with a lower\n                    <jats:italic>M<\/jats:italic>\n                    <jats:sub>w<\/jats:sub>\n                    exhibited a larger fraction of form II than the higher\n                    <jats:italic>M<\/jats:italic>\n                    <jats:sub>w<\/jats:sub>\n                    PB\u20101 at the same CO\n                    <jats:sub>2<\/jats:sub>\n                    pressure, and the former required a higher pressure to completely suppress the formation of form II. It was shown that differences in chain morphologies in the formed crystals played a decisive role in polymorph selection. PB\u20101 with a lower\n                    <jats:italic>M<\/jats:italic>\n                    <jats:sub>w<\/jats:sub>\n                    crystallized into form II with chain\u2010extended crystals, whereas PB\u20101 with a higher\n                    <jats:italic>M<\/jats:italic>\n                    <jats:sub>w<\/jats:sub>\n                    crystallized into form II with folded\u2010chain crystals. A lower nucleation free energy barrier was expected in the former than in the latter, weakening the suppression of form II in a lower\n                    <jats:italic>M<\/jats:italic>\n                    <jats:sub>w<\/jats:sub>\n                    PB\u20101 under compressed CO\n                    <jats:sub>2<\/jats:sub>\n                    .\n                  <\/jats:p>","DOI":"10.1002\/marc.202500952","type":"journal-article","created":{"date-parts":[[2026,1,20]],"date-time":"2026-01-20T08:18:07Z","timestamp":1768897087000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Molar Mass Dependent Polymorph Selection of Polybutene\u20101 Under Compressed CO\n                    <sub>2<\/sub>"],"prefix":"10.1002","volume":"47","author":[{"given":"Dong","family":"Lyu","sequence":"first","affiliation":[{"name":"State Key Laboratory of Polymer Science and Technology Changchun Institute of Applied Chemistry Chinese Academy of Sciences 5625 Renmin Street Changchun 130022 P. R. China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ying","family":"Lu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Polymer Science and Technology Changchun Institute of Applied Chemistry Chinese Academy of Sciences 5625 Renmin Street Changchun 130022 P. R. China"},{"name":"School of Applied Chemistry and Engineering University of Science and Technology of China  Hefei P. R. China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Patrick C.","family":"Lee","sequence":"additional","affiliation":[{"name":"Multifunctional Composites Manufacturing Laboratory Department of Mechanical and Industrial Engineering University of Toronto Toronto M5S 3G8 Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xiao","family":"Yang","sequence":"additional","affiliation":[{"name":"(Guangdong) High\u2010end Materials Research Institute 176 Shihua Road Guangzhou 510700 P. R. China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Cenhui","family":"Han","sequence":"additional","affiliation":[{"name":"Petrochemical Research Institute PetroChina Co Ltd. Beijing 102200 P. R. China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3277-2227","authenticated-orcid":false,"given":"Yongfeng","family":"Men","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Polymer Science and Technology Changchun Institute of Applied Chemistry Chinese Academy of Sciences 5625 Renmin Street Changchun 130022 P. R. China"},{"name":"School of Applied Chemistry and Engineering University of Science and Technology of China  Hefei P. R. 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