Exploring Factors that Determine Cis/Trans Structure and Tacticity in Polymers Prepared by Ring Opening Metathesis Polymerizations Involving Initiators of the Type Syn and Anti Mo(NAr)(CHCMe2Ph)(OR)2. Observation of a Temperature Dependent Cis/Trans Ratio.
MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF CHEMISTRY
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The factors that determine the structure cistrans and tacticity of polymers prepared by ring opening metathesis polymerization ROMP Using well-defined initiators of the type MoNArylCHCMe2PhOR2 Aryl a substituted aryl group and OR a variety of alkoxides have been explored. The main finding is a dependence of cistrans structure on temperature at low temperatures -35 deg C all cis polymer is formed and at high temperatures 65 deg C up to 90 trans polymers are formed. These results are consistent with formation of cis polymer from syn alkylidene rotamers and trans polymer from anti alkylidene rotamers in circumstances where syn and anti rotamers can interconvert. jg
- Polymer Chemistry
- Inorganic Chemistry
- Organic Chemistry
- Physical Chemistry