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Controlled/Living Radical Polymerization of Methacrylic Monomers in the Presence of Lewis Acids: Influence on Tacticity

✍ Scribed by Jean-François Lutz; Wojciech Jakubowski; Krzysztof Matyjaszewski

Publisher
John Wiley and Sons
Year
2004
Tongue
English
Weight
163 KB
Volume
25
Category
Article
ISSN
1022-1336

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✦ Synopsis

Abstract

Summary: Atom transfer radical polymerization (ATRP) and reversible addition‐fragmentation transfer (RAFT) polymerization of N‐methyl methacrylamide and methyl methacrylate were investigated in the presence of rare‐earth triflates known to enhance polymer isotacticity. Poly(N‐methyl methacrylamide) with controlled molecular weight, low polydispersity, and enhanced isotacticity was prepared by ATRP and RAFT in the presence of catalytic amounts of yttrium trifluoromethanesulfonate or ytterbium trifluoromethanesulfonate. The tacticity of poly(N‐methyl methacrylamide) depends on the Lewis acid concentration: well‐defined polymers with predominantly either syndiotactic, atactic, or isotactic triads were prepared by adjusting the concentration of the Lewis acid. Simultaneous control of molecular weights, polydispersities, and tacticities in the polymerization of methyl methacrylate was less successful.

Free radical propagation in the presence of a Lewis acid (LA) giving rise to chelate control.

magnified imageFree radical propagation in the presence of a Lewis acid (LA) giving rise to chelate control.

📜 SIMILAR VOLUMES

Radical polymerization of methyl methacr
Radical polymerization of methyl methacrylate in the presence of magnesium bromide as the Lewis acid
✍ Akikazu Matsumoto; Shoji Nakamura 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 130 KB 👁 3 views

We carried out the radical polymerization of methyl methacrylate (MMA) at 0 -80°C in the presence of magnesium bromide. The polymerization rate and the molecular weight of the resulting polymers increased according to the amount of the added magnesium bromide as the Lewis acid. It was revealed that

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Plasma-Initiated Controlled/Living Radical Polymerization of Methyl Methacrylate in the Presence of 2-Cyanoprop-2-yl 1-dithionaphthalate (CPDN)
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## Abstract **Summary:** Plasma‐initiated controlled/living radical polymerization of methyl methacrylate (MMA) was carried out in the presence of 2‐cyanoprop‐2‐yl 1‐dithionaphthalate. Well‐defined poly(methyl methacrylate) (PMMA), with a narrow polydispersity, could be synthesized. The polymerizat