Isoselective Ring-opening Polymerization of Racemic Lactide Catalyzed by <italic style="font-style: italic">N</italic>-heterocyclic Olefin/(Thio)urea Organocatalysts

Zhen-Yu Wang; Guang-Qiang Xu; Li Zhou; Cheng-Dong Lv; Ru-Lin Yang; Bing-Zhe Dong; Qing-Gang Wang

doi:10.1007/s10118-021-2535-x

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Isoselective Ring-opening Polymerization of Racemic Lactide Catalyzed by N-heterocyclic Olefin/(Thio)urea Organocatalysts

ARTICLE | Updated：2021-01-05

- Isoselective Ring-opening Polymerization of Racemic Lactide Catalyzed by N-heterocyclic Olefin/(Thio)urea Organocatalysts
- Isoselective Ring-opening Polymerization of Racemic Lactide Catalyzed by N-heterocyclic Olefin/(Thio)urea Organocatalysts
- Chinese Journal of Polymer Science 2021年39卷第6期页码：709-715
- Affiliations：
  
  a.Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China
  b.Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
- Author bio：
  
  xu_gq@qibebt.ac.cn (G.Q.X.)
  zhouli@qibebt.ac.cn (L.Z.)
  wangqg@qibebt.ac.cn (Q.G.W.)
- Funds：
  
  This work was financially supported by the National Key R&D Plan (No. 2017YFC1104800), the National Natural Science Foundation of China (Nos. 21901249 and 21950410529), Taishan Scholars Program of Shandong Province (No. tsqn201812112), and “135” Projects Fund of CAS-QIBEBT Director Innovation Foundation and DICP & QIBEBT United Foundation (No. UN201701).
- DOI：10.1007/s10118-021-2535-x
  中图分类号：
- 收稿：2020-10-29，
  
  修回：2020-11-25，
  
  录用：2020-11-29，
  
  网络首发：2021-01-05，
  
  纸质出版：2021-04-15
- Accepted：
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Wang, Z. Y.; Xu, G. Q.; Zhou, L.; Lv, C. D.; Yang, R. L.; Dong, B. Z.; Wang, Q. G. Isoselective ring-opening polymerization of racemic lactide catalyzed by , N,-heterocyclic olefin/(thio)urea organocatalysts. Chinese J. Polym. Sci. 2021, 39, 709–715

Zhen-Yu Wang, Guang-Qiang Xu, Li Zhou, et al. Isoselective Ring-opening Polymerization of Racemic Lactide Catalyzed by N-heterocyclic Olefin/(Thio)urea Organocatalysts[J]. Chinese Journal of Polymer Science, 2021, 39(6): 709-715. DOI: 10.1007/s10118-021-2535-x.
Wang, Z. Y.; Xu, G. Q.; Zhou, L.; Lv, C. D.; Yang, R. L.; Dong, B. Z.; Wang, Q. G. Isoselective ring-opening polymerization of racemic lactide catalyzed by , N,-heterocyclic olefin/(thio)urea organocatalysts. Chinese J. Polym. Sci. 2021, 39, 709–715 DOI： 10.1007/s10118-021-2535-x.

Zhen-Yu Wang, Guang-Qiang Xu, Li Zhou, et al. Isoselective Ring-opening Polymerization of Racemic Lactide Catalyzed by N-heterocyclic Olefin/(Thio)urea Organocatalysts[J]. Chinese Journal of Polymer Science, 2021, 39(6): 709-715. DOI: 10.1007/s10118-021-2535-x. DOI：

摘要

Abstract

The isoselective ring-opening polymerization of racemic lactide was achieved by combining

-heterocyclic olefin (NHO) with mono(thio)ureas or bis(thio)ureas as catalytic systems. The polymerization process shows high stereoselectivity

controllability and reactivity

delivering multi-block isotactic polylactides with high chain-end fidelity and narrow molecular weight distributions. The enhancement of catalytic performance was observed in the following order: bisthiourea (DTU)

monothiourea (TU)

bisurea (DU)

urea (U). The highest

(probability of forming a

meso

dyad) = 0.91 was observed at −70 °C when using NHO/U1 catalytic system and the high stereoselectivity was attributed to chain-end control mechanism.

关键词

Keywords

references

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DOI：10.1007/s10118-021-2535-x

摘要

Abstract

关键词

Keywords

references