Polymerization of 2-methyl-4-phenylbut-1-en-3-yne

✍ Scribed by Armando Pineda; Roberto Salcedo; Federico del Río; Takeshi Ogawa

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 351 KB
• Volume: 29
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(93)90006-2

✦ Synopsis

Alwtract--An enyne monomer, 2-methyl-4-phenylbut-l-en-3-yne, was prepared and its polymerization was studied. It did not give a polymer with a free radical initiator, however, a yellow polymer was obtained by thermal polymerization at 120 ° by cyclization followed by ring opening, n-Butyllithium and boron trifluoride etherate gave polymers, the number-average molecular weights ranged from 1000 to 3500. The poor polymerizability in free radical and anionic polymerization was attributed to the allylic hydrogen which is attacked by the propagating species, and the contribution of the ethynyl group to the resonance stabilization of the propagating radical or anion is thought to be small. The polymers crosslinked on heating above 150 ° to give infusible orange coloured polymer by reaction between ethynyl groups.