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On the Radiation-Induced Polymerisation of 2,3-Dihydropyran

✍ Scribed by Sergej Naumov; Igor Janovský; Wolfgang Knolle; Reiner Mehnert

Publisher
John Wiley and Sons
Year
2004
Tongue
English
Weight
134 KB
Volume
205
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

Summary: Concentrated (5 mol‐%) solutions of 2,3‐dihydropyran in CFCl~2~CF~2~Cl matrix were irradiated at 77 K and several intermediates – radical cation, dimer radical cation, dihydropyryl radical and a trapped polymer radical – were observed by low‐temperature EPR spectroscopy. The irradiated solutions yielded after melting a polymeric product, which was characterised by IR spectroscopy and GPC. The polydisperse polymer is assumed to be formed by a cationic process initiated by a dimer carbocation. The polymerization proceeds via the ring double bonds, while ring‐opening reaction occurs in a small extent. The free‐radical mechanism via the dihydropyryl radical leads to low molecular weight oligomers only. The quantum chemical calculations support the interpretation of the experimental results.
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