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Rapid Commun."],"published-print":{"date-parts":[[2026,3]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>\n                    Geometric configuration of C\u2550C bonds along the polymer backbone plays a crucial role in determining the physical properties of the resulting materials. However, the key role of\n                    <jats:italic>cis<\/jats:italic>\n                    \/\n                    <jats:italic>trans<\/jats:italic>\n                    \u2010C\u2550C units in the crystallization and physical property of stereoisomeric polymers has not been well understood. Herein, we report a unique series of linear unsaturated polyesters,\n                    <jats:italic>poly(butene succinate)<\/jats:italic>\n                    (PBuS), with the precisely controlled\n                    <jats:italic>cis<\/jats:italic>\n                    \/\n                    <jats:italic>trans<\/jats:italic>\n                    \u2010C\u2550C unit contents synthesized via melt polycondensation. High\u2010molecular\u2010weight\n                    <jats:italic>cis<\/jats:italic>\n                    \/\n                    <jats:italic>trans<\/jats:italic>\n                    \u2010polyesters without detectable isomerization or saturation of C\u2550C bonds were prepared in the used polycondensation method. We find that the synthesized PBuS was crystallizable across the entire range of\n                    <jats:italic>cis<\/jats:italic>\n                    \/\n                    <jats:italic>trans<\/jats:italic>\n                    unit ratios and showed the unique isodimorphic\u2010like crystallization behavior, with an asymmetric pseudo\u2010eutectic point at \u223c31%\n                    <jats:italic>cis<\/jats:italic>\n                    \u2010unit content. Notably,\n                    <jats:italic>cis<\/jats:italic>\n                    \u2010PBuS crystallized much faster than its\n                    <jats:italic>trans<\/jats:italic>\n                    \u2010counterpart, highlighting the profound effect of C\u2550C isomerism on crystallization behavior. Mechanical properties of PBuS correlated strongly with the crystallinity and crystalline structure, showing low strength and modulus but high flexibility around the pseudo\u2010eutectic composition. This work elucidates the crucial role of\n                    <jats:italic>cis<\/jats:italic>\n                    \/\n                    <jats:italic>trans<\/jats:italic>\n                    isomerism in polymer crystallization and provides a rational way for designing the aliphatic polyesters with tailored physical properties.\n                  <\/jats:p>","DOI":"10.1002\/marc.202500947","type":"journal-article","created":{"date-parts":[[2026,1,9]],"date-time":"2026-01-09T08:49:17Z","timestamp":1767948557000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Isodimorphic\u2010Like Crystallization and Mechanical Properties of Unsaturated\n                    <i>Poly(butene succinate)<\/i>\n                    : Crucial Role of\n                    <i>Cis<\/i>\n                    \/\n                    <i>Trans<\/i>\n                    Isomeric Contents"],"prefix":"10.1002","volume":"47","author":[{"given":"Wangkai","family":"Xiang","sequence":"first","affiliation":[{"name":"State Key Laboratory of Chemical Engineering and Low\u2010Carbon Technology College of Chemical and Biological Engineering Zhejiang University  Hangzhou China"},{"name":"Institute of Zhejiang University\u2010Quzhou  Quzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lingling","family":"Ni","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Chemical Engineering and Low\u2010Carbon Technology College of Chemical and Biological Engineering Zhejiang University  Hangzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xing","family":"Zhang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Chemical Engineering and Low\u2010Carbon Technology College of Chemical and Biological Engineering Zhejiang University  Hangzhou 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