Issue 3, 2014

A “click” approach to facile synthesis of long-chain highly branched ROMP polymers

Abstract

The click chemistry strategy was successfully applied for the preparation of long-chain highly branched ring-opening metathesis polymers (LCHBPs). The hydroxyl-functionalized monotelechelic polymers with various molecular weights were synthesized first via ring-opening metathesis polymerization of N-azidopentyl oxanorbornene imide in the presence of a symmetrical functional terminating agent, and then transformed into alkynyl-monotelechelic polymers, which acted as ABn-type macromonomers for subsequent click reaction to finally produce LCHBPs as the reaction time prolonged. All intermediates, macromonomer, and the resultant LCHBPs were characterized in detail by mass spectroscopy, elemental analysis, FTIR, GPC, and NMR measurements. The experimental results showed that polymerization has a two-step feature, that is, a fast and a slow increase of the average degree of polymerization at the initial and the subsequent stages, respectively. The final LCHBPs have high molecular weight up to Mn,NMR = 210 600, and relatively moderate molecular weight distributions (Mw/Mn = 2.12–1.67).

Graphical abstract: A “click” approach to facile synthesis of long-chain highly branched ROMP polymers

Article information

Article type
Paper
Submitted
12 Aug 2013
Accepted
02 Sep 2013
First published
03 Sep 2013

Polym. Chem., 2014,5, 733-742

A “click” approach to facile synthesis of long-chain highly branched ROMP polymers

L. Ding, J. An and Z. Zhu, Polym. Chem., 2014, 5, 733 DOI: 10.1039/C3PY01085F

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