Novel epoxide-promoted polymerization of lactides mediated by a zinc guanidine complex: a potential strategy for the tin-free PLA industry

被引：6

作者：

Suo, Hongyi ^{[1
,2
]}

Liu, Shuang ^{[1
]}

Liu, Jiaoyu ^{[1
]}

Zhang, Zisheng ^{[1
]}

Qu, Rui ^{[1
,2
]}

Gu, Yanan ^{[1
,2
]}

Qin, Yusheng ^{[1
,2
]}

机构：

[1] Yantai Univ, Coll Chem & Chem Engn, Yantai 264005, Shandong, Peoples R China

[2] Yantai Univ, Inst Mat, Yantai 264005, Shandong, Peoples R China

来源：

POLYMER CHEMISTRY | 2023年 / 14卷 / 40期

基金：

中国国家自然科学基金;

关键词：

RING-OPENING POLYMERIZATION; RAC-LACTIDE; ZN(II) COMPLEXES; CATALYSTS; MECHANISM;

D O I：

10.1039/d3py00890h

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

A unique example of a bench-stable guanidine-ligated zinc complex has been thoroughly evaluated for its effectiveness towards the ring-opening polymerization (ROP) of lactides (l-LA and rac-LA) with the assistance of epoxides. The present catalytic system exhibits exceptional polymerization activity even under simulated industrial conditions. Specifically, it can reach a turnover frequency (TOF) value of 106 500 h-1 under very low catalyst loading (monomer/catalyst = 50 000/1) at an elevated temperature (180 degrees C), which surpasses those of traditional zinc analogs, resulting in high molecular weight (32.2 kg mol-1) polylactide (PLA) with an extremely low zinc residue content of 6.7 mg kg-1. Based on kinetic studies and spectroscopic analysis, a plausible coordination-insertion mechanism is proposed, with the potential to generate the Zn-alkoxide (Zn-OR) active species. This research sheds light on the development of an eco-friendly catalytic system with improved efficiency for the lactide polymerization industry. An epoxy-promoted zinc guanidine complex system with extremely high efficiency (106 500 h-1) is reported towards the controlled ROP of lactides.

引用

页码：4652 / 4658

页数：7