Ring-opening metathesis polymerization of cyclohexenyl norbornene in air and protic media using ruthenium-based catalysts

✍ Scribed by W. Apichatachutapan; L. J. Mathias

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 167 KB
• Volume: 67
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19980103)67:1<183::aid-app21>3.0.co;2-1

✦ Synopsis

Optimized ring-opening metathesis polymerization (ROMP) conditions for cyclohexenyl norbornene (CHNB) have been determined. ROMP of CHNB was carried out with ruthenium trichloride hydrate and ruthenium benzylidene catalysts. The effects of mol % catalyst, type of catalyst, use of a dissolution aid (for RuCl 3 r1H 2 O), reaction time and temperature on conversion and gel time were investigated. ROMP with 0.0027 mol % ruthenium benzylidene at room temperature gave CHNB conversions ranging from 97 to 99% with gel times of ca. 24 min. With ruthenium trichloride hydrate and using ethanol as a dissolution aid, only 60-80% conversions with gel times of ca. 43 min occurred at 55-60ЊC. The obtained polyCHNB's were crosslinked or not, epending on ROMP conditions. All polyCHNB' exhibited 5% weight loss at ca. 420 and 430ЊC under nitrogen and air atmospheres, respectively. The DSC measured glass transition temperature of all polyCHNB samples was 105ЊC.