✦ LIBER ✦

The Effect of Persistent TEMPO Radicals on the Gilch Polymerization

✍ Scribed by Jens Wiesecke; Matthias Rehahn

Publisher: John Wiley and Sons
Year: 2007
Tongue: English
Weight: 143 KB
Volume: 28
Category: Article
ISSN: 1022-1336
DOI: 10.1002/marc.200600655

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

The mechanism of the Gilch polymerization leading to poly(p‐phenylene vinylenes) is still a matter of controversial discussion. Similar to some other research groups, we strongly favor a basically radical process. Moreover, we believe it is initiated by spontaneously formed diradicals. Here, we describe further experimental evidence which clearly supports the assumed initiation step: it is shown how the polymerization process is affected quantitatively when different amounts of 2,2,6,6‐tetramethylpiperidine‐N‐oxyl (TEMPO) are added as a scavenger. In full agreement with our expectations, the chain growth is either retarded or completely prevented, depending on the respective molar ratio of monomer and scavenger.

magnified image

📜 SIMILAR VOLUMES

The persistent radical effect in control

The persistent radical effect in controlled radical polymerizations

✍ Hanns Fischer 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 245 KB 👁 2 views

We describe the basic kinetic features of "living" polymerizations controlled and regulated by persistent radicals or related species and by reversible atom transfer. In these systems a special kinetic phenomenon operates-the Persistent Radical Ef-fect. It is also known from selective organic synthe

The Persistent Radical Effect in Nitroxi

The Persistent Radical Effect in Nitroxide Mediated Polymerization: Experimental Validity

✍ Jean-François Lutz; Patrick Lacroix-Desmazes; Bernard Boutevin 📂 Article 📅 2001 🏛 John Wiley and Sons 🌐 English ⚖ 111 KB 👁 2 views

ChemInform Abstract: The Persistent Radi

ChemInform Abstract: The Persistent Radical Effect: A Principle for Selective Radical Reactions and Living Radical Polymerizations

✍ Hanns Fischer 📂 Article 📅 2010 🏛 John Wiley and Sons ⚖ 24 KB 👁 1 views

Tin-Free Radical Chemistry Using the Per

Tin-Free Radical Chemistry Using the Persistent Radical Effect: Alkoxyamine Isomerization, Addition Reactions and Polymerizations

✍ Armido Studer 📂 Article 📅 2004 🏛 John Wiley and Sons ⚖ 51 KB 👁 1 views

The effect of polymerization temperature

The effect of polymerization temperature on the structure of radical copolymers

✍ A.D. Jenkins; M.G. Rayner 📂 Article 📅 1972 🏛 Elsevier Science 🌐 English ⚖ 733 KB

The effect of polymerization temperature on radical reactivity ratios in the copolymerization of styrene and methyl methacrylate, and on the microstructure of the resulting copolymers, has been investigated by the application of high resolution nuclear magnetic resonance techniques. Analysis of the

A note on the effects of tetramethylthiu

A note on the effects of tetramethylthiuram monosulphide on radical polymerizations

✍ J.C. Bevington; F.S. Rankin 📂 Article 📅 1969 🏛 Elsevier Science 🌐 English ⚖ 224 KB

Abstraet--A report is given of effects of tetramethyithiuram monosulphide (TMTM) upon the polymerization of styrene at 80 °; it can act as both an initiator and a retarder and there is great sensitivity to light. Experiments with ~4C-TMTM show that transfer to initiator is important. Attempts were m