{"title":"利用氨基苯酚锌氯化物从 rac-Lactide 可控合成高分子量和同位环状聚乳酸","authors":"Haicheng Wang, and , Haiyan Ma*, ","doi":"10.1021/acs.macromol.4c00937","DOIUrl":null,"url":null,"abstract":"<p >No-end topology provides cyclic polyesters with potential abstracting applications, but more efficient and selective routes still need to be explored to access cyclic polyesters with high molecular weights and tacticity control. We report here that a series of aminophenolate zinc chlorides display hyperstability and hyper productivity toward the ring-opening polymerization of technical grade <i>rac</i>-lactide (<i>rac</i>-LA) in cyclohexene oxide, capable of converting up to 20,000 equiv of <i>rac</i>-LA (TONs up to 18,600) to cyclic polymers with high molecular weights and narrow to moderate distributions (<i>M</i><sub>n</sub> up to 58.0 kg/mol, <i>D̵</i> = 1.19–1.60). At ambient temperature, highly isotactic cyclic poly(<i>rac</i>-LA)s could be obtained (e.g., complex <b>6</b>, <i>P</i><sub>m</sub> = 0.87, <i>M</i><sub>n</sub> = 23.5 kg/mol, 25 °C; with <i>P</i><sub>m</sub> further improved to 0.93 at −45 °C), which show to possess stereoblocky microstructures. Selective end-to-end cyclization proved to be thoroughly involved in the polymerization, leading to cyclic polylactides with only even-numbered lactyl units.</p>","PeriodicalId":51,"journal":{"name":"Macromolecules","volume":null,"pages":null},"PeriodicalIF":5.1000,"publicationDate":"2024-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Controlled Synthesis of High-Molecular-Weight and Isotactic Cyclic Polylactides from rac-Lactide Using Aminophenolate Zinc Chlorides\",\"authors\":\"Haicheng Wang, and , Haiyan Ma*, \",\"doi\":\"10.1021/acs.macromol.4c00937\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p >No-end topology provides cyclic polyesters with potential abstracting applications, but more efficient and selective routes still need to be explored to access cyclic polyesters with high molecular weights and tacticity control. We report here that a series of aminophenolate zinc chlorides display hyperstability and hyper productivity toward the ring-opening polymerization of technical grade <i>rac</i>-lactide (<i>rac</i>-LA) in cyclohexene oxide, capable of converting up to 20,000 equiv of <i>rac</i>-LA (TONs up to 18,600) to cyclic polymers with high molecular weights and narrow to moderate distributions (<i>M</i><sub>n</sub> up to 58.0 kg/mol, <i>D̵</i> = 1.19–1.60). At ambient temperature, highly isotactic cyclic poly(<i>rac</i>-LA)s could be obtained (e.g., complex <b>6</b>, <i>P</i><sub>m</sub> = 0.87, <i>M</i><sub>n</sub> = 23.5 kg/mol, 25 °C; with <i>P</i><sub>m</sub> further improved to 0.93 at −45 °C), which show to possess stereoblocky microstructures. Selective end-to-end cyclization proved to be thoroughly involved in the polymerization, leading to cyclic polylactides with only even-numbered lactyl units.</p>\",\"PeriodicalId\":51,\"journal\":{\"name\":\"Macromolecules\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":5.1000,\"publicationDate\":\"2024-06-18\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Macromolecules\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://pubs.acs.org/doi/10.1021/acs.macromol.4c00937\",\"RegionNum\":1,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"POLYMER SCIENCE\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Macromolecules","FirstCategoryId":"92","ListUrlMain":"https://pubs.acs.org/doi/10.1021/acs.macromol.4c00937","RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"POLYMER SCIENCE","Score":null,"Total":0}
Controlled Synthesis of High-Molecular-Weight and Isotactic Cyclic Polylactides from rac-Lactide Using Aminophenolate Zinc Chlorides
No-end topology provides cyclic polyesters with potential abstracting applications, but more efficient and selective routes still need to be explored to access cyclic polyesters with high molecular weights and tacticity control. We report here that a series of aminophenolate zinc chlorides display hyperstability and hyper productivity toward the ring-opening polymerization of technical grade rac-lactide (rac-LA) in cyclohexene oxide, capable of converting up to 20,000 equiv of rac-LA (TONs up to 18,600) to cyclic polymers with high molecular weights and narrow to moderate distributions (Mn up to 58.0 kg/mol, D̵ = 1.19–1.60). At ambient temperature, highly isotactic cyclic poly(rac-LA)s could be obtained (e.g., complex 6, Pm = 0.87, Mn = 23.5 kg/mol, 25 °C; with Pm further improved to 0.93 at −45 °C), which show to possess stereoblocky microstructures. Selective end-to-end cyclization proved to be thoroughly involved in the polymerization, leading to cyclic polylactides with only even-numbered lactyl units.
期刊介绍:
Macromolecules publishes original, fundamental, and impactful research on all aspects of polymer science. Topics of interest include synthesis (e.g., controlled polymerizations, polymerization catalysis, post polymerization modification, new monomer structures and polymer architectures, and polymerization mechanisms/kinetics analysis); phase behavior, thermodynamics, dynamic, and ordering/disordering phenomena (e.g., self-assembly, gelation, crystallization, solution/melt/solid-state characteristics); structure and properties (e.g., mechanical and rheological properties, surface/interfacial characteristics, electronic and transport properties); new state of the art characterization (e.g., spectroscopy, scattering, microscopy, rheology), simulation (e.g., Monte Carlo, molecular dynamics, multi-scale/coarse-grained modeling), and theoretical methods. Renewable/sustainable polymers, polymer networks, responsive polymers, electro-, magneto- and opto-active macromolecules, inorganic polymers, charge-transporting polymers (ion-containing, semiconducting, and conducting), nanostructured polymers, and polymer composites are also of interest. Typical papers published in Macromolecules showcase important and innovative concepts, experimental methods/observations, and theoretical/computational approaches that demonstrate a fundamental advance in the understanding of polymers.