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由吡啶酰胺锌(II)催化剂制备的左旋、右旋和消旋丙交酯与ε-己内酯的定制嵌段共聚物——一锅法顺序开环聚合反应

Tailor-made block copolymers of l-, d- and -lactides and ε-caprolactone one-pot sequential ring opening polymerization by pyridylamidozinc(ii) catalysts.

作者信息

D'Auria Ilaria, D'Alterio Massimo Christian, Tedesco Consiglia, Pellecchia Claudio

机构信息

Dipartimento di Chimica e Biologia "A. Zambelli", Università Degli Studi di Salerno Via Giovanni Paolo II 132 84084 Fisciano SA Italy

Dipartimento di Scienze Chimiche, Università "Federico II" di Napoli Via Cintia 21 80126 Napoli Italy.

出版信息

RSC Adv. 2019 Oct 14;9(56):32771-32779. doi: 10.1039/c9ra07133d. eCollection 2019 Oct 10.

DOI:10.1039/c9ra07133d
PMID:35529720
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9073191/
Abstract

Three-coordinated Zn(ii) complexes bearing sterically encumbered bidentate monoanionic [, ] pyridylamido ligands efficiently catalyze the ring opening polymerization of lactide (LA) and ε-caprolactone (CL). Owing to the polymerization controlled nature and high rate, precise stereodiblock poly(LLA--DLA) with different block lengths can be easily produced by one-pot sequential monomer addition at room temperature in short reaction times. NMR, SEC and DSC analyses confirm the production of highly isotactic diblock copolymers which crystallize in the high melting stereocomplex phase. Stereo-triblock and tetrablock copolymers of l-LA, d-LA and -LA have been synthesized similarly. Finally, a diblock poly(CL--LA) has been easily obtained by sequential addition of ε-caprolactone and lactide under mild conditions.

摘要

带有空间位阻双齿单阴离子[, ]吡啶酰胺配体的三配位锌(II)配合物能够高效催化丙交酯(LA)和ε-己内酯(CL)的开环聚合反应。由于聚合反应具有可控性且速率较高,通过在室温下短反应时间内一锅法顺序添加单体,能够轻松制备出具有不同嵌段长度的精确立体双嵌段聚(LLA--DLA)。核磁共振(NMR)、尺寸排阻色谱(SEC)和差示扫描量热法(DSC)分析证实生成了在高熔点立体复合相结晶的高度全同立构双嵌段共聚物。l-LA、d-LA和-LA的立体三嵌段和四嵌段共聚物也已通过类似方法合成。最后,在温和条件下通过顺序添加ε-己内酯和丙交酯,轻松获得了双嵌段聚(CL--LA)。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/048d/9073191/def93717dec2/c9ra07133d-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/048d/9073191/2789b31682cc/c9ra07133d-s1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/048d/9073191/ca80e8a1e84d/c9ra07133d-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/048d/9073191/4d44857cca03/c9ra07133d-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/048d/9073191/d15568f3781f/c9ra07133d-s2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/048d/9073191/d2f70d438753/c9ra07133d-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/048d/9073191/2bbe5191737d/c9ra07133d-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/048d/9073191/def93717dec2/c9ra07133d-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/048d/9073191/2789b31682cc/c9ra07133d-s1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/048d/9073191/ca80e8a1e84d/c9ra07133d-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/048d/9073191/4d44857cca03/c9ra07133d-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/048d/9073191/d15568f3781f/c9ra07133d-s2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/048d/9073191/d2f70d438753/c9ra07133d-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/048d/9073191/2bbe5191737d/c9ra07133d-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/048d/9073191/def93717dec2/c9ra07133d-f5.jpg

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