𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Synthesis of Eight-shaped Poly(ethylene oxide) by the Combination of Glaser Coupling with Ring-opening Polymerization

✍ Scribed by Guowei Wang; Xiaoshan Fan; Bin Hu; Yannan Zhang; Junlian Huang

Publisher
John Wiley and Sons
Year
2011
Tongue
English
Weight
390 KB
Volume
32
Category
Article
ISSN
1022-1336

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

The eight‐shaped poly(ethylene oxide) (PEO) is synthesized by a combination of Glaser coupling with ring‐opening polymerization (ROP). Firstly, the star‐shaped (PEO‐OH)~4~ is synthesized by ROP of ethylene oxide (EO) using pentaerythritol as an initiator and diphenylmethyl potassium (DPMK) as a deprotonated agent, and then the alkyne group is introduced onto the PEO arm‐end to give (PEO‐Alkyne)~4~ in a NaH/tetrahydrofuran (THF) system. The intramolecular cyclization is carried out by a Glaser coupling reaction in a pyridine/CuBr/N,N,N′,N″,N″‐pentamethyldiethylenetriamine (PMDETA) system at room temperature in an air atmosphere, and eight‐shaped PEO was formed with high efficiency (almost 100%). The target polymers and intermediates were well characterized by SEC, MALDI‐TOF MS, ^1^H NMR and FT‐IR in detail. magnified image

📜 SIMILAR VOLUMES

Controlled Synthesis and Characterizatio
Controlled Synthesis and Characterization of Poly[ethylene-block-(L,L-lactide)]s by Combining Catalytic Ethylene Oligomerization with “Coordination-Insertion” Ring-Opening Polymerization
✍ Jochen O. Ring; Ralf Thomann; Rolf Mülhaupt; Jean-Marie Raquez; Philippe Degée; 📂 Article 📅 2007 🏛 John Wiley and Sons 🌐 English ⚖ 284 KB

## Abstract Model poly[ethylene‐__block__‐(L,L‐lactide)] (PE‐__block__‐PLA) block copolymers were successfully synthesized by combining metallocene catalyzed ethylene oligomerization with ring‐opening polymerization (ROP) of L,L‐lactide (LA). Hydroxy‐terminated polyethylene (PE‐OH) macroinitiator w

Synthesis and Characterization of Poly(t
Synthesis and Characterization of Poly(trimethylene oxide)-block-Polystyrene and Poly(trimethylene oxide)-block-Polystyrene-block-Poly(methyl methacrylate) by Combination of Atom Transfer Radical Polymerization (ATRP) and Cationic Ring-Opening Polymerization (CROP)
✍ Bin Luan; Qin Yuan; Cai-Yuan Pan 📂 Article 📅 2004 🏛 John Wiley and Sons 🌐 English ⚖ 159 KB

## Abstract **Summary:** Diblock copolymers, poly(trimethylene oxide)‐__block__‐poly(styrene)s abbreviated as poly(TMO)‐__block__‐poly(St), and triblock copolymers, poly(TMO)‐__block__‐poly(St)‐__block__‐poly(MMA)s (MMA = methyl methacrylate), with controlled molecular weight and narrow polydispers

Synthesis of poly(ethylene oxide) macroi
Synthesis of poly(ethylene oxide) macroinitiators with a view to the preparation of block copolymers by radical polymerization
✍ Ramiro Guerrero Santos; Jean G. Zilliox; Jean E. Herz; Gerard J. Beinert 📂 Article 📅 1992 🏛 Elsevier Science 🌐 English ⚖ 716 KB

Abstraet--Poly(ethylene oxide) radical macroinitiators with built-in benzopinacolate groups were prepared by two different methods: the first one involves a hydrosilylation reaction between ct, co-difunctional polylethylene oxide (PEO) precursors and a difunctional benzopinacolate; due to the presen

Synthesis of poly(ϵ-caprolactone)-block-
Synthesis of poly(ϵ-caprolactone)-block-poly(n-butyl acrylate) by the combination of ring-opening polymerization and atom transfer radical polymerization with Ti[OCH2CCl3]4 as a difunctional initiator. II. Synthesis and characterization of poly(ϵ-caprolactone)-block-poly(n-butyl acrylate) copolymers
✍ Peichun Li; Zhean Xia; Amar Zerroukhi; Jianding Chen; Yvan Chalamet; Thomas Jean 📂 Article 📅 2009 🏛 John Wiley and Sons 🌐 English ⚖ 403 KB 👁 1 views

## Abstract The kinetics and controllability of the Ti[OCH~2~CCl~3~]~4~‐initiated atom transfer radical polymerization (ATRP) of __n__‐butyl acrylate were investigated. Then, with Ti[OCH~2~CCl~3~]~4~ as the initiator, poly(ϵ‐caprolactone)‐__block__‐poly(__n__‐butyl acrylate) (PCL‐__b__‐PBA) copolym