𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Block Copolymers From Living Emulsion Polymerization: Reactor Operating Strategies and Blocking Efficiency

✍ Scribed by Ibrahem S. Altarawneh; Vincent G. Gomes; Mourtada H. Srour

Book ID
102952796
Publisher
John Wiley and Sons
Year
2011
Tongue
English
Weight
559 KB
Volume
6
Category
Article
ISSN
1862-832X

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

Diblock copolymers are generated using xanthate‐based RAFT agents in conjunction with emulsion polymerization via stage‐wise operations. First, emulsion polymerization is conducted for styrene, methyl acrylate, and butyl acrylate monomers to obtain polymers of specified molar mass. At the second stage, polymers undergo chain extension to produce block copolymers. Linear growth of molecular weight with respect to conversion establishes the living characteristics of the process. Under batch conditions, partly homopolymers are produced. Semi‐batch operation produces copolymers of higher purity with low polydispersity. The choice of blocking sequence is crucial for reducing the influence of the terminated chains on the distribution sequence of copolymers produced.magnified image

📜 SIMILAR VOLUMES

A modified glass reactor for the prepara
A modified glass reactor for the preparation of linear and star-branched block copolymers via living anionic polymerization
✍ R. F. Storey; M. E. Nelson 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 182 KB 👁 1 views

A modular high-vacuum system for large-scale anionic polymerization reactions was designed that utilizes mechanical agitation in place of magnetic stirring, Teflon Rotoflo stopcocks in place of glass breakseals, and spherical o-ring joints in place of direct glass seals. A standard reactor body was

New Strategy Targeting Well-Defined Poly
New Strategy Targeting Well-Defined Polymethylene-block-Polystyrene Copolymers: The Combination of Living Polymerization of Ylides and Atom Transfer Radical Polymerization
✍ Jian-Zhuang Chen; Kun Cui; Shu-Yuan Zhang; Peng Xie; Qiao-Ling Zhao; Jin Huang; 📂 Article 📅 2009 🏛 John Wiley and Sons 🌐 English ⚖ 342 KB

## Abstract Well‐defined polymethylene‐__block__‐polystyrene (PM‐__b__‐PS) diblock copolymers were synthesized via a combination of living polymerization of ylides and atom transfer radical polymerization (ATRP) of styrene. A series of hydroxyl‐terminated polymethylenes (PM‐OHs) with different mole